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Cryo MCP 🧊

A Model Completion Protocol (MCP) server for the Cryo blockchain data extraction tool.

Cryo MCP allows you to access Cryo's powerful blockchain data extraction capabilities via an API server that implements the MCP protocol, making it easy to query blockchain data from any MCP-compatible client.

For LLM Users: SQL Query Workflow Guide

When using this MCP server to run SQL queries on blockchain data, follow this workflow:

  1. Download data with query_dataset:

    result = query_dataset(
        dataset="blocks",  # or "transactions", "logs", etc.
        blocks="15000000:15001000",  # or use blocks_from_latest=100
        output_format="parquet"  # important: use parquet for SQL
    )
    files = result.get("files", [])  # Get the returned file paths
  2. Explore schema with get_sql_table_schema:

    # Check what columns are available in the file
    schema = get_sql_table_schema(files[0])
    # Now you can see all columns, data types, and sample data
  3. Run SQL with query_sql:

    # Option 1: Simple table reference (DuckDB will match the table name to file)
    sql_result = query_sql(
        query="SELECT block_number, timestamp, gas_used FROM blocks",
        files=files  # Pass the files from step 1
    )
    
    # Option 2: Using read_parquet() with explicit file path
    sql_result = query_sql(
        query=f"SELECT block_number, timestamp, gas_used FROM read_parquet('{files[0]}')",
        files=files  # Pass the files from step 1
    )

Alternatively, use the combined approach with query_blockchain_sql:

# Option 1: Simple table reference
result = query_blockchain_sql(
    sql_query="SELECT * FROM blocks",
    dataset="blocks",
    blocks_from_latest=100
)

# Option 2: Using read_parquet()
result = query_blockchain_sql(
    sql_query="SELECT * FROM read_parquet('/path/to/file.parquet')",  # Path doesn't matter
    dataset="blocks",
    blocks_from_latest=100
)

For a complete working example, see examples/sql_workflow_example.py.

Related MCP server: EVM MCP Server

Features

  • Full Cryo Dataset Access: Query any Cryo dataset through an API server

  • MCP Integration: Works seamlessly with MCP clients

  • Flexible Query Options: Support for all major Cryo filtering and output options

  • Block Range Options: Query specific blocks, latest block, or relative ranges

  • Contract Filtering: Filter data by contract address

  • Latest Block Access: Easy access to the latest Ethereum block data

  • Multiple Output Formats: JSON, CSV, and Parquet support

  • Schema Information: Get detailed dataset schemas and sample data

  • SQL Queries: Run SQL queries directly against downloaded blockchain data

Installation (Optional)

This is not required if you will run the tool with uvx directly.

# install with UV (recommended)
uv tool install cryo-mcp

Requirements

  • Python 3.8+

  • uv

  • A working installation of Cryo

  • Access to an Ethereum RPC endpoint

  • DuckDB (for SQL query functionality)

Quick Start

Usage with Claude Code

  1. Run claude mcp add for an interactive prompt.

  2. Enter uvx as the command to run.

  3. Enter cryo-mcp --rpc-url <ETH_RPC_URL> [--data-dir <DATA_DIR>] as the args

  4. Alternatively, provide ETH_RPC_URL and CRYO_DATA_DIR as environment variables instead.

New instances of claude will now have access to cryo as configured to hit your RPC endpoint and store data in the specified directory.

Available Tools

Cryo MCP exposes the following MCP tools:

list_datasets()

Returns a list of all available Cryo datasets.

Example:

client.list_datasets()

query_dataset()

Query a Cryo dataset with various filtering options.

Parameters:

  • dataset (str): The name of the dataset to query (e.g., 'blocks', 'transactions', 'logs')

  • blocks (str, optional): Block range specification (e.g., '1000:1010')

  • start_block (int, optional): Start block number (alternative to blocks)

  • end_block (int, optional): End block number (alternative to blocks)

  • use_latest (bool, optional): If True, query the latest block

  • blocks_from_latest (int, optional): Number of blocks from latest to include

  • contract (str, optional): Contract address to filter by

  • output_format (str, optional): Output format ('json', 'csv', 'parquet')

  • include_columns (list, optional): Columns to include alongside defaults

  • exclude_columns (list, optional): Columns to exclude from defaults

Example:

# Get transactions from blocks 15M to 15.01M
client.query_dataset('transactions', blocks='15M:15.01M')

# Get logs for a specific contract from the latest 100 blocks
client.query_dataset('logs', blocks_from_latest=100, contract='0x1234...')

# Get just the latest block
client.query_dataset('blocks', use_latest=True)

lookup_dataset()

Get detailed information about a specific dataset, including schema and sample data.

Parameters:

  • name (str): The name of the dataset to look up

  • sample_start_block (int, optional): Start block for sample data

  • sample_end_block (int, optional): End block for sample data

  • use_latest_sample (bool, optional): Use latest block for sample

  • sample_blocks_from_latest (int, optional): Number of blocks from latest for sample

Example:

client.lookup_dataset('logs')

get_latest_ethereum_block()

Returns information about the latest Ethereum block.

Example:

client.get_latest_ethereum_block()

SQL Query Tools

Cryo MCP includes several tools for running SQL queries against blockchain data:

query_sql()

Run a SQL query against downloaded blockchain data.

Parameters:

  • query (str): SQL query to execute

  • files (list, optional): List of parquet file paths to query. If None, will use all files in the data directory.

  • include_schema (bool, optional): Whether to include schema information in the result

Example:

# Run against all available files
client.query_sql("SELECT * FROM read_parquet('/path/to/blocks.parquet') LIMIT 10")

# Run against specific files
client.query_sql(
    "SELECT * FROM read_parquet('/path/to/blocks.parquet') LIMIT 10",
    files=['/path/to/blocks.parquet']
)

query_blockchain_sql()

Query blockchain data using SQL, automatically downloading any required data.

Parameters:

  • sql_query (str): SQL query to execute

  • dataset (str, optional): The dataset to query (e.g., 'blocks', 'transactions')

  • blocks (str, optional): Block range specification

  • start_block (int, optional): Start block number

  • end_block (int, optional): End block number

  • use_latest (bool, optional): If True, query the latest block

  • blocks_from_latest (int, optional): Number of blocks before the latest to include

  • contract (str, optional): Contract address to filter by

  • force_refresh (bool, optional): Force download of new data even if it exists

  • include_schema (bool, optional): Include schema information in the result

Example:

# Automatically downloads blocks data if needed, then runs the SQL query
client.query_blockchain_sql(
    sql_query="SELECT block_number, gas_used, timestamp FROM blocks ORDER BY gas_used DESC LIMIT 10",
    dataset="blocks",
    blocks_from_latest=100
)

list_available_sql_tables()

List all available tables that can be queried with SQL.

Example:

client.list_available_sql_tables()

get_sql_table_schema()

Get the schema for a specific parquet file.

Parameters:

  • file_path (str): Path to the parquet file

Example:

client.get_sql_table_schema("/path/to/blocks.parquet")

get_sql_examples()

Get example SQL queries for different blockchain datasets.

Example:

client.get_sql_examples()

Configuration Options

When starting the Cryo MCP server, you can use these command-line options:

  • --rpc-url URL: Ethereum RPC URL (overrides ETH_RPC_URL environment variable)

  • --data-dir PATH: Directory to store downloaded data (overrides CRYO_DATA_DIR environment variable, defaults to ~/.cryo-mcp/data/)

Environment Variables

  • ETH_RPC_URL: Default Ethereum RPC URL to use when not specified via command line

  • CRYO_DATA_DIR: Default directory to store downloaded data when not specified via command line

Advanced Usage

SQL Queries Against Blockchain Data

Cryo MCP allows you to run powerful SQL queries against blockchain data, combining the flexibility of SQL with Cryo's data extraction capabilities:

Two-Step SQL Query Flow

You can split data extraction and querying into two separate steps:

# Step 1: Download data and get file paths
download_result = client.query_dataset(
    dataset="transactions",
    blocks_from_latest=1000,
    output_format="parquet"
)

# Step 2: Use the file paths to run SQL queries
file_paths = download_result.get("files", [])
client.query_sql(
    query=f"""
    SELECT 
        to_address as contract_address, 
        COUNT(*) as tx_count,
        SUM(gas_used) as total_gas,
        AVG(gas_used) as avg_gas
    FROM read_parquet('{file_paths[0]}')
    WHERE to_address IS NOT NULL
    GROUP BY to_address
    ORDER BY total_gas DESC
    LIMIT 20
    """,
    files=file_paths
)

Combined SQL Query Flow

For convenience, you can also use the combined function that handles both steps:

# Get top gas-consuming contracts
client.query_blockchain_sql(
    sql_query="""
    SELECT 
        to_address as contract_address, 
        COUNT(*) as tx_count,
        SUM(gas_used) as total_gas,
        AVG(gas_used) as avg_gas
    FROM read_parquet('/path/to/transactions.parquet')
    WHERE to_address IS NOT NULL
    GROUP BY to_address
    ORDER BY total_gas DESC
    LIMIT 20
    """,
    dataset="transactions",
    blocks_from_latest=1000
)

# Find blocks with the most transactions
client.query_blockchain_sql(
    sql_query="""
    SELECT 
        block_number, 
        COUNT(*) as tx_count
    FROM read_parquet('/path/to/transactions.parquet')
    GROUP BY block_number
    ORDER BY tx_count DESC
    LIMIT 10
    """,
    dataset="transactions",
    blocks="15M:16M"
)

# Analyze event logs by topic
client.query_blockchain_sql(
    sql_query="""
    SELECT 
        topic0, 
        COUNT(*) as event_count
    FROM read_parquet('/path/to/logs.parquet')
    GROUP BY topic0
    ORDER BY event_count DESC
    LIMIT 20
    """,
    dataset="logs",
    blocks_from_latest=100
)

Note: For SQL queries, always use output_format="parquet" when downloading data to ensure optimal performance with DuckDB. When using query_blockchain_sql, you should refer to the file paths directly in your SQL using the read_parquet() function.

Querying with Block Ranges

Cryo MCP supports the full range of Cryo's block specification syntax:

# Using block numbers
client.query_dataset('transactions', blocks='15000000:15001000')

# Using K/M notation
client.query_dataset('logs', blocks='15M:15.01M')

# Using offsets from latest 
client.query_dataset('blocks', blocks_from_latest=100)

Contract Filtering

Filter logs and other data by contract address:

# Get all logs for USDC contract
client.query_dataset('logs', 
                    blocks='16M:16.1M', 
                    contract='0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48')

Column Selection

Include only the columns you need:

# Get just block numbers and timestamps
client.query_dataset('blocks', 
                    blocks='16M:16.1M', 
                    include_columns=['number', 'timestamp'])

Development

Project Structure

cryo-mcp/
ā”œā”€ā”€ cryo_mcp/           # Main package directory
│   ā”œā”€ā”€ __init__.py     # Package initialization
│   ā”œā”€ā”€ server.py       # Main MCP server implementation
│   ā”œā”€ā”€ sql.py          # SQL query functionality
ā”œā”€ā”€ tests/              # Test directory
│   ā”œā”€ā”€ test_*.py       # Test files
ā”œā”€ā”€ pyproject.toml      # Project configuration
ā”œā”€ā”€ README.md           # Project documentation

Run Tests

uv run pytest

License

MIT

Credits

  • Built on top of the amazing Cryo tool by Paradigm

  • Uses the MCP protocol for API communication

Available Tools

10 tools
get_latest_ethereum_blockB
Get information about the latest Ethereum block

Returns:
    Information about the latest block including block number
ParametersJSON Schema
NameRequiredDescriptionDefault

No parameters

TDQS

B3/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the full burden of behavioral disclosure. It mentions the return includes 'block number,' but doesn't specify other behavioral traits such as rate limits, error conditions, data freshness, or whether it's a read-only operation. This leaves significant gaps in understanding how the tool behaves beyond its basic function.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is concise and well-structured, with two sentences that efficiently convey the tool's purpose and return value. There's no wasted language, and it's front-loaded with the main function. However, it could be slightly more polished by integrating the return information into the first sentence for better flow.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the complexity of blockchain data retrieval and the lack of annotations and output schema, the description is incomplete. It mentions returning 'information about the latest block including block number,' but doesn't detail other returned fields (e.g., timestamp, transactions), error handling, or performance considerations. This leaves the agent with insufficient context for effective use.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The tool has 0 parameters, and the schema description coverage is 100%, so there are no parameters to document. The description doesn't need to add parameter semantics, and it appropriately doesn't mention any. A baseline of 4 is applied since no parameters exist, and the description doesn't introduce confusion about them.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool's purpose: 'Get information about the latest Ethereum block.' It specifies the verb ('get') and resource ('latest Ethereum block'), making the function unambiguous. However, it doesn't explicitly differentiate from sibling tools like 'get_transaction_by_hash' or 'query_blockchain_sql,' which prevents a perfect score.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance on when to use this tool versus alternatives. It doesn't mention when this tool is appropriate (e.g., for real-time block data) or when to use other tools like 'query_blockchain_sql' for more complex queries. This lack of contextual direction leaves the agent without usage instructions.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

get_sql_examplesA
Get example SQL queries for different blockchain datasets with DuckDB

SQL WORKFLOW TIPS:
1. First download data: result = query_dataset('dataset_name', blocks='...', output_format='parquet')
2. Inspect schema: schema = get_sql_table_schema(result['files'][0])
3. Run SQL: query_sql("SELECT * FROM read_parquet('/path/to/file.parquet')", files=result['files'])

OR use the combined approach:
- query_blockchain_sql(sql_query="SELECT * FROM read_parquet('...')", dataset='blocks', blocks='...')

Returns:
    Dictionary of example queries categorized by dataset type and workflow patterns
ParametersJSON Schema
NameRequiredDescriptionDefault

No parameters

TDQS

A4.5/5.0
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the full burden of behavioral disclosure. It clearly describes the return format ('Dictionary of example queries categorized by dataset type and workflow patterns'), which is helpful. However, it doesn't mention potential limitations like rate limits, authentication needs, or whether the examples are static or dynamically generated. The description doesn't contradict any annotations (none exist).

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is well-structured with clear sections (purpose, workflow tips, combined approach, returns). It's appropriately sized for the complexity, though the workflow tips section is somewhat lengthy for a tool that just returns examples. Every sentence earns its place by providing practical guidance, but it could be slightly more concise by integrating tips more tightly with the core purpose.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's complexity (parameterless, no output schema, no annotations), the description is quite complete. It explains the purpose, provides extensive usage guidance, and describes the return format. The only minor gap is lack of explicit behavioral constraints (e.g., whether examples are curated/static), but overall it's well-rounded for this type of helper tool.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The tool has 0 parameters, and schema description coverage is 100% (empty schema). The description appropriately doesn't discuss parameters, which is correct for a parameterless tool. It focuses instead on output semantics and usage context, adding value beyond the empty schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool's purpose: 'Get example SQL queries for different blockchain datasets with DuckDB'. It specifies the exact resource (example SQL queries) and distinguishes from siblings like query_sql (executes SQL) or list_datasets (lists datasets). The verb 'Get' is specific and unambiguous.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides explicit usage guidance through 'SQL WORKFLOW TIPS' and 'OR use the combined approach', detailing when to use this tool (for learning/example queries) versus alternatives like query_sql or query_blockchain_sql (for actual execution). It names specific sibling tools (query_dataset, get_sql_table_schema, query_sql, query_blockchain_sql) and explains their roles in workflows.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

get_sql_table_schemaA
Get the schema and sample data for a specific parquet file

WORKFLOW NOTE: Use this function to explore the structure of parquet files
before writing SQL queries against them. This will show you:
1. All available columns and their data types
2. Sample data from the file
3. Total row count

Usage example:
1. Get list of files: files = list_available_sql_tables()
2. For a specific file: schema = get_sql_table_schema(files[0]['path'])
3. Use columns in your SQL: query_sql("SELECT column1, column2 FROM read_parquet('/path/to/file.parquet')")

Args:
    file_path: Path to the parquet file (from list_available_sql_tables or query_dataset)
    
Returns:
    Table schema information including columns, data types, and sample data
ParametersJSON Schema
NameRequiredDescriptionDefault
file_pathYes

TDQS

A4.6/5.0
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries full burden and does well by disclosing key behaviors: it returns schema, sample data, and row count; it's for exploration (not modification); and it requires a file path from other tools. It doesn't mention performance characteristics or error handling, but covers the core functionality adequately.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is well-structured with clear sections (purpose, workflow note, usage example, args, returns) and every sentence adds value. It's slightly longer than minimal but justified by the comprehensive guidance. The front-loaded purpose statement is excellent.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a single-parameter tool with no annotations and no output schema, the description provides excellent context: clear purpose, usage guidelines, parameter explanation, and return value description. It doesn't detail the exact output structure, but given the tool's exploratory nature and the sibling context, this is reasonably complete.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters5/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The input schema has 0% description coverage, so the description must compensate fully. It clearly explains the single parameter's purpose ('Path to the parquet file'), source ('from list_available_sql_tables or query_dataset'), and provides usage examples showing how to obtain and use it, adding significant value beyond the bare schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the specific action ('Get the schema and sample data'), resource ('for a specific parquet file'), and distinguishes it from siblings like list_available_sql_tables (which lists files) and query_sql (which executes queries). The WORKFLOW NOTE further clarifies its exploratory purpose.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description explicitly states when to use this tool ('to explore the structure of parquet files before writing SQL queries') and provides a detailed workflow example showing how it integrates with sibling tools (list_available_sql_tables and query_sql). It clearly positions this as a preparatory step for querying.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

get_transaction_by_hashC
Get detailed information about a transaction by its hash

Args:
    tx_hash: The transaction hash to look up
    
Returns:
    Detailed information about the transaction
ParametersJSON Schema
NameRequiredDescriptionDefault
tx_hashYes

TDQS

C2.9/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the full burden of behavioral disclosure but offers minimal information. It states what the tool does but doesn't cover important aspects like error handling (what happens with invalid hashes), performance characteristics, rate limits, authentication requirements, or whether this is a read-only operation. The description is functionally correct but lacks operational context.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is efficiently structured with clear sections for purpose, arguments, and returns. Each sentence serves a distinct purpose without redundancy. The formatting with headers makes it easy to parse, though the 'Returns' section could be more specific given there's no output schema.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a tool with no annotations, no output schema, and 0% schema description coverage, the description is insufficiently complete. It covers the basic operation but lacks critical information about what 'detailed information' includes, error conditions, performance expectations, and how this tool relates to the available SQL query alternatives on the server.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The description explicitly documents the single parameter 'tx_hash' and its purpose ('The transaction hash to look up'), which adds value beyond the schema's 0% description coverage. However, it doesn't provide format details (e.g., hex string, length requirements) or validation rules that would be helpful for proper usage.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool's purpose with a specific verb ('Get') and resource ('detailed information about a transaction'), making it immediately understandable. However, it doesn't differentiate this tool from potential siblings like 'query_blockchain_sql' or 'query_dataset' that might also retrieve transaction data through different mechanisms.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance on when to use this tool versus alternatives. With siblings like 'query_blockchain_sql' and 'query_dataset' available, there's no indication whether this is the preferred method for transaction lookups, if it's faster for single transactions, or when SQL queries would be more appropriate.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

list_available_sql_tablesA
List all available parquet files that can be queried with SQL

USAGE NOTES:
- This function lists parquet files that have already been downloaded
- Each file can be queried using read_parquet('/path/to/file.parquet') in your SQL
- For each file, this returns the file path, dataset type, and other metadata
- Use these file paths in your SQL queries with query_sql()

Returns:
    List of available files and their metadata
ParametersJSON Schema
NameRequiredDescriptionDefault

No parameters

TDQS

A4.6/5.0
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries full burden and does well by explaining what gets returned (file path, dataset type, metadata), how to use the output (with read_parquet() and query_sql()), and the prerequisite that files must be 'already downloaded'. It doesn't mention performance characteristics or error conditions, but provides substantial behavioral context.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is well-structured with clear sections, front-loads the core purpose, and every sentence adds value. The USAGE NOTES bullet points efficiently convey critical information without redundancy.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a zero-parameter tool with no annotations or output schema, the description provides excellent context about what the tool does, how to use its output, and relationships to other tools. It could mention error conditions or performance, but covers the essential usage context thoroughly.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The tool has 0 parameters with 100% schema coverage, so the baseline is 4. The description appropriately doesn't discuss parameters since none exist, focusing instead on what the tool does and how to use its output.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the verb 'list' and the resource 'parquet files that can be queried with SQL', specifying that these are files that have already been downloaded. It distinguishes from siblings like list_datasets by focusing specifically on SQL-queryable parquet files rather than datasets in general.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The USAGE NOTES section explicitly states when to use this tool (to get file paths for SQL queries) and how to use the output with query_sql(). It also distinguishes from alternatives by noting these are 'already downloaded' files, implying list_datasets might show available datasets that aren't yet downloaded.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

list_datasetsB

Return a list of all available cryo datasets

ParametersJSON Schema
NameRequiredDescriptionDefault

No parameters

TDQS

B3.2/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries full burden for behavioral disclosure. It states the tool returns a list but doesn't specify format, pagination, rate limits, authentication needs, or whether it's read-only. For a tool with zero annotation coverage, this leaves significant gaps in understanding its behavior.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, efficient sentence that directly states what the tool does. It's front-loaded with the core action and resource, with zero wasted words or redundant information, making it highly concise and well-structured.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's simplicity (0 parameters, no output schema, no annotations), the description is adequate as a basic read operation. However, it lacks details about return format, data scope, or how it fits with sibling tools, which would help the agent use it more effectively in context.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The tool has 0 parameters with 100% schema description coverage, so the schema fully documents the lack of inputs. The description doesn't need to add parameter information, and it appropriately doesn't mention any. Baseline for 0 parameters is 4, as the description focuses on the tool's purpose without unnecessary parameter details.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the action ('Return a list') and resource ('all available cryo datasets'), making the purpose immediately understandable. However, it doesn't differentiate from sibling tools like 'lookup_dataset' or 'list_available_sql_tables', which prevents a perfect score.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance on when to use this tool versus alternatives like 'lookup_dataset' or 'query_dataset'. It lacks any context about prerequisites, timing, or exclusions, leaving the agent to infer usage from the tool name alone.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

lookup_datasetA
Look up a specific dataset and return detailed information about it. IMPORTANT: Always use this
function before querying a new dataset to understand its required parameters and schema.

The returned information includes:
1. Required parameters for the dataset (IMPORTANT for datasets like 'balances' that need an address)
2. Schema details showing available columns and data types
3. Example queries for the dataset

When the dataset requires specific parameters like 'address' (for 'balances'),
ALWAYS use the 'contract' parameter in query_dataset() to pass these values.

Example:
For 'balances' dataset, lookup_dataset('balances') will show it requires an 'address' parameter.
You should then query it using:
query_dataset('balances', blocks='1000:1010', contract='0x1234...')

Args:
    name: The name of the dataset to look up
    sample_start_block: Optional start block for sample data (integer)
    sample_end_block: Optional end block for sample data (integer)
    use_latest_sample: If True, use the latest block for sample data
    sample_blocks_from_latest: Number of blocks before the latest to include in sample
    
Returns:
    Detailed information about the dataset including schema and available fields
ParametersJSON Schema
NameRequiredDescriptionDefault
nameYes
sample_blocks_from_latestNo
sample_end_blockNo
sample_start_blockNo
use_latest_sampleNo

TDQS

A4.6/5.0
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries full burden and does well by explaining the tool's behavior: it's a read-only lookup (implied by 'look up' and 'return information'), it provides schema details and required parameters, and it includes sample data generation capabilities. However, it doesn't mention rate limits, authentication needs, or error conditions.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is appropriately sized and front-loaded with the core purpose and important usage guideline. Every sentence adds value, though the example section is somewhat lengthy. The structure flows logically from purpose to usage to parameters to returns.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a tool with 5 parameters, 0% schema coverage, no annotations, and no output schema, the description does an excellent job of explaining what the tool does, when to use it, and what parameters mean. The main gap is lack of information about return format details, though it describes what information will be included.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters5/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The schema has 0% description coverage, but the description fully compensates by explaining all 5 parameters in detail. It clarifies that 'name' is the dataset identifier, and the other 4 parameters control sample data generation (with specific examples like 'sample_blocks_from_latest'). This adds substantial meaning beyond the bare schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool's purpose with specific verbs ('look up', 'return detailed information') and resource ('dataset'), distinguishing it from siblings like list_datasets (which lists datasets) or query_dataset (which queries data). It explicitly explains this is for understanding dataset parameters and schema before querying.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides explicit guidance on when to use this tool ('Always use this function before querying a new dataset') and when to use alternatives (query_dataset for actual queries). It includes a concrete example showing the workflow between lookup_dataset and query_dataset, making the usage context clear.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

query_blockchain_sqlA
Download blockchain data and run SQL query in a single step

CONVENIENCE FUNCTION: This combines query_dataset and query_sql into one call.

You can write SQL queries using either approach:
1. Simple table references: "SELECT * FROM blocks LIMIT 10"
2. Explicit read_parquet: "SELECT * FROM read_parquet('/path/to/file.parquet') LIMIT 10"

DATASET-SPECIFIC PARAMETERS:
For datasets that require specific address parameters (like 'balances', 'erc20_transfers', etc.),
ALWAYS use the 'contract' parameter to pass ANY Ethereum address. For example:

- For 'balances' dataset: Use contract parameter for the address you want balances for
  query_blockchain_sql(
      sql_query="SELECT * FROM balances",
      dataset="balances",
      blocks='1000:1010',
      contract='0x123...'  # Address you want balances for
  )

Examples:
```
# Using simple table name
query_blockchain_sql(
    sql_query="SELECT * FROM blocks LIMIT 10",
    dataset="blocks",
    blocks_from_latest=100
)

# Using read_parquet() (the path will be automatically replaced)
query_blockchain_sql(
    sql_query="SELECT * FROM read_parquet('/any/path.parquet') LIMIT 10",
    dataset="blocks",
    blocks_from_latest=100
)
```

ALTERNATIVE WORKFLOW (more control):
If you need more control, you can separate the steps:
1. Download data: result = query_dataset('blocks', blocks_from_latest=100, output_format='parquet')
2. Inspect schema: schema = get_sql_table_schema(result['files'][0])
3. Run SQL query: query_sql("SELECT * FROM blocks", files=result['files'])

Args:
    sql_query: SQL query to execute - using table names or read_parquet()
    dataset: The specific dataset to query (e.g., 'transactions', 'logs', 'balances')
             If None, will be extracted from the SQL query
    blocks: Block range specification as a string (e.g., '1000:1010')
    start_block: Start block number (alternative to blocks)
    end_block: End block number (alternative to blocks)
    use_latest: If True, query the latest block
    blocks_from_latest: Number of blocks before the latest to include
    contract: Contract address to filter by - IMPORTANT: Use this parameter for ALL address-based filtering
      regardless of the parameter name in the native cryo command (address, contract, etc.)
    force_refresh: Force download of new data even if it exists
    include_schema: Include schema information in the result
    
Returns:
    SQL query results and metadata
ParametersJSON Schema
NameRequiredDescriptionDefault
blocksNo
blocks_from_latestNo
contractNo
datasetNo
end_blockNo
force_refreshNo
include_schemaNo
sql_queryYes
start_blockNo
use_latestNo

TDQS

A4.6/5.0
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the full burden of behavioral disclosure. It does well by explaining the two SQL query approaches, dataset-specific parameter requirements, and the return format ('SQL query results and metadata'). However, it doesn't mention performance characteristics, rate limits, or error conditions that would be helpful for a complex tool with 10 parameters.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is well-structured with clear sections (purpose, convenience note, SQL approaches, dataset-specific guidance, examples, alternative workflow, and parameter details). While comprehensive, some sections could be more concise - the examples are quite detailed, and the description is lengthy overall for a tool description.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a complex tool with 10 parameters, 0% schema coverage, no annotations, and no output schema, the description does an excellent job of providing context. It explains the tool's relationship to siblings, provides usage examples, clarifies parameter semantics, and describes return values. The main gap is lack of information about performance, limits, or error handling.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters5/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

With 0% schema description coverage and 10 parameters, the description compensates excellently. It provides detailed explanations for key parameters like 'contract' with specific examples, clarifies parameter relationships (blocks vs start_block/end_block), and explains default behaviors. The 'Args' section adds crucial semantic context beyond the bare schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool's purpose: 'Download blockchain data and run SQL query in a single step' and explicitly distinguishes it from siblings by naming 'query_dataset' and 'query_sql' as separate tools that this one combines. It specifies the exact functionality and differentiates from alternatives.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides explicit guidance on when to use this tool vs alternatives: it states this is a 'CONVENIENCE FUNCTION' that combines two other tools, and provides an 'ALTERNATIVE WORKFLOW' section detailing when to use the separate steps for 'more control'. It clearly delineates the trade-offs between convenience and control.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

query_datasetA
Download blockchain data and return the file paths where the data is stored.

IMPORTANT WORKFLOW NOTE: When running SQL queries, use this function first to download
data, then use the returned file paths with query_sql() to execute SQL on those files.

Example workflow for SQL:
1. First download data: result = query_dataset('transactions', blocks='1000:1010', output_format='parquet')
2. Get file paths: files = result.get('files', [])
3. Run SQL query: query_sql("SELECT * FROM read_parquet('/path/to/file.parquet')", files=files)

DATASET-SPECIFIC PARAMETERS:
For datasets that require specific address parameters (like 'balances', 'erc20_transfers', etc.),
ALWAYS use the 'contract' parameter to pass ANY Ethereum address. For example:

- For 'balances' dataset: Use contract parameter for the address you want balances for
  query_dataset('balances', blocks='1000:1010', contract='0x123...')

- For 'logs' or 'erc20_transfers': Use contract parameter for contract address
  query_dataset('logs', blocks='1000:1010', contract='0x123...')

To check what parameters a dataset requires, always use lookup_dataset() first:
lookup_dataset('balances')  # Will show required parameters

Args:
    dataset: The name of the dataset to query (e.g., 'logs', 'transactions', 'balances')
    blocks: Block range specification as a string (e.g., '1000:1010')
    start_block: Start block number as integer (alternative to blocks)
    end_block: End block number as integer (alternative to blocks)
    use_latest: If True, query the latest block
    blocks_from_latest: Number of blocks before the latest to include (e.g., 10 = latest-10 to latest)
    contract: Contract address to filter by - IMPORTANT: Use this parameter for ALL address-based filtering
      regardless of the parameter name in the native cryo command (address, contract, etc.)
    output_format: Output format (json, csv, parquet) - use 'parquet' for SQL queries
    include_columns: Columns to include alongside the defaults
    exclude_columns: Columns to exclude from the defaults

Returns:
    Dictionary containing file paths where the downloaded data is stored
ParametersJSON Schema
NameRequiredDescriptionDefault
blocksNo
blocks_from_latestNo
contractNo
datasetYes
end_blockNo
exclude_columnsNo
include_columnsNo
output_formatNojson
start_blockNo
use_latestNo

TDQS

A4.6/5.0
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the full burden of behavioral disclosure. It effectively describes the tool's behavior: it downloads data to files, returns a dictionary of file paths, and integrates with query_sql. It mentions dataset-specific requirements and workflow dependencies, though it doesn't cover potential errors, rate limits, or file storage details.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is well-structured with clear sections (workflow note, dataset-specific parameters, Args, Returns) and uses bullet points for readability. It's appropriately sized for a complex tool but could be slightly more concise by integrating the example workflow more tightly with the parameter explanations.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a complex tool with 10 parameters, 0% schema coverage, no annotations, and no output schema, the description provides comprehensive context. It explains the tool's role in a larger workflow, details all parameters, and describes the return value. The main gap is lack of error handling or performance considerations, but it's largely complete given the constraints.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters5/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Given 0% schema description coverage, the description compensates fully by explaining all 10 parameters in detail. It clarifies dataset-specific usage (e.g., contract parameter for address filtering), provides examples for blocks and output_format, and explains parameter relationships (e.g., blocks vs. start_block/end_block). This adds significant meaning beyond the bare schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool's purpose: 'Download blockchain data and return the file paths where the data is stored.' It specifies the verb ('download'), resource ('blockchain data'), and output ('file paths'), distinguishing it from siblings like query_sql or list_datasets that don't download data.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides explicit guidance on when to use this tool vs. alternatives: 'When running SQL queries, use this function first to download data, then use the returned file paths with query_sql() to execute SQL on those files.' It also advises to use lookup_dataset() first to check dataset parameters, offering clear workflow instructions.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

query_sqlA
Run a SQL query against downloaded blockchain data files

IMPORTANT WORKFLOW: This function should be used after calling query_dataset
to download data. Use the file paths returned by query_dataset as input to this function.

Workflow steps:
1. Download data: result = query_dataset('transactions', blocks='1000:1010', output_format='parquet')
2. Get file paths: files = result.get('files', [])
3. Execute SQL using either:
   - Direct table references: query_sql("SELECT * FROM transactions", files=files)
   - Or read_parquet(): query_sql("SELECT * FROM read_parquet('/path/to/file.parquet')", files=files)

To see the schema of a file, use get_sql_table_schema(file_path) before writing your query.

DuckDB supports both approaches:
1. Direct table references (simpler): "SELECT * FROM blocks"
2. read_parquet function (explicit): "SELECT * FROM read_parquet('/path/to/file.parquet')"

Args:
    query: SQL query to execute - can use simple table names or read_parquet()
    files: List of parquet file paths to query (typically from query_dataset results)
    include_schema: Whether to include schema information in the result
    
Returns:
    Query results and metadata
ParametersJSON Schema
NameRequiredDescriptionDefault
filesNo
include_schemaNo
queryYes

TDQS

A4.6/5.0
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the full burden of behavioral disclosure. It effectively explains the tool's behavior: it executes SQL queries against parquet files, supports two query approaches (direct table references or read_parquet()), and mentions DuckDB as the underlying engine. It also notes that results include query results and metadata. The main gap is lack of information about error handling, performance characteristics, or limitations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is well-structured with clear sections (purpose, workflow, examples, parameter explanations, return value). While comprehensive, it could be more concise - some information is repeated (e.g., both workflow steps and DuckDB approaches mention the two query methods). Every sentence earns its place, but some tightening is possible.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's complexity (SQL execution with file dependencies), no annotations, and no output schema, the description provides substantial context. It explains the workflow, parameter usage, and return values. The main gap is lack of output format details - while it mentions 'Query results and metadata', it doesn't specify the structure. For a SQL execution tool, more detail on result format would be helpful.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters5/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

With 0% schema description coverage, the description fully compensates by explaining all three parameters. It clarifies that 'query' is the SQL to execute with syntax examples, 'files' are typically from query_dataset results, and 'include_schema' controls whether schema information is included in results. The description adds substantial value beyond the bare schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool's purpose as 'Run a SQL query against downloaded blockchain data files', specifying both the action (run SQL query) and the target resource (downloaded blockchain data files). It distinguishes this from sibling tools like query_dataset (which downloads data) and get_sql_table_schema (which shows schema).

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides explicit workflow guidance: 'This function should be used after calling query_dataset to download data.' It names the specific prerequisite tool (query_dataset) and explains the sequence of operations. The 'IMPORTANT WORKFLOW' section clearly defines when to use this tool versus alternatives.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections. Dates show when Glama detected each change.

  1. 10 tool updatesv1.0.0
    • First observedget_latest_ethereum_block
    • First observedget_sql_examples
    • First observedget_sql_table_schema
    • First observedget_transaction_by_hash
    • First observedlist_available_sql_tables
    • First observedlist_datasets
    • First observedlookup_dataset
    • First observedquery_blockchain_sql
    • First observedquery_dataset
    • First observedquery_sql

TDQS

A4/5.0
Disambiguation4/5

Most tools have distinct purposes, but there is some overlap between query_blockchain_sql and the combination of query_dataset + query_sql. The descriptions clarify that query_blockchain_sql is a convenience function combining the two, which helps reduce confusion, but agents might still need to decide between the separate or combined approach.

Naming Consistency5/5

All tool names follow a consistent verb_noun pattern with snake_case, such as get_latest_ethereum_block, list_available_sql_tables, and query_dataset. This consistency makes the tool set predictable and easy to navigate for agents.

Tool Count5/5

With 10 tools, the server is well-scoped for its purpose of blockchain data querying and SQL analysis. Each tool serves a clear role, from data retrieval (e.g., get_transaction_by_hash) to dataset exploration (e.g., lookup_dataset) and SQL execution (e.g., query_sql), without feeling bloated or sparse.

Completeness5/5

The tool set provides comprehensive coverage for blockchain data workflows, including data fetching (get_latest_ethereum_block, get_transaction_by_hash), dataset discovery (list_datasets, lookup_dataset), data download (query_dataset), SQL querying (query_sql, query_blockchain_sql), and schema inspection (get_sql_table_schema, list_available_sql_tables). There are no obvious gaps, and the tools support full CRUD-like operations for the domain.

Maintenance

ActivityInactive
ResponsivenessNo issues

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