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 echo action but doesn't mention any behavioral traits like whether it modifies input, has rate limits, requires authentication, or what format the output takes. 'Echo back' implies a simple return, but no details are given about the return mechanism or potential side effects.

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

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

The description is a single, efficient sentence with zero wasted words. It's appropriately sized for a simple tool and front-loads the core functionality immediately.

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

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

For a simple 1-parameter tool with no annotations and no output schema, the description is minimally adequate. It states the basic purpose but lacks details about output format or behavioral context that would be helpful given the absence of structured fields. It's complete enough to understand what it does but not rich in operational guidance.

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

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

Schema description coverage is 100%, with the parameter 'message' fully documented in the schema as 'Message to echo'. The description doesn't add any meaning beyond what the schema provides about parameters, so it meets the baseline of 3 when the schema does the heavy lifting.

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

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

The description clearly states the tool's function ('Echo back') with the specific resource ('the provided message'), making the purpose immediately understandable. It doesn't distinguish from siblings like 'get_time' or 'hello_world', but the verb+resource combination is specific enough for basic understanding.

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

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

No guidance is provided about when to use this tool versus alternatives like 'hello_world' (which might return a fixed greeting) or 'get_time' (which returns time data). The description only states what it does, not when it should be selected over sibling tools.

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

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 states the action ('Get the current time') but lacks details on format, timezone, permissions, or error handling, which are important for a time-fetching tool.

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

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

The description is extremely concise and front-loaded with a single, clear sentence that directly states the tool's function. There's no wasted wording, making it highly efficient for an agent to parse.

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

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

For a simple, parameterless tool with no output schema, the description is minimally adequate. However, it lacks details on return format (e.g., timestamp vs. string) and behavioral context, which could help the agent use it more effectively.

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

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

The input schema has 0 parameters with 100% coverage, so no parameter documentation is needed. The description doesn't add parameter details, which is appropriate, but a perfect score is reserved for cases where it actively compensates for schema gaps.

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

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 ('current time'), making it immediately understandable. However, it doesn't differentiate from sibling tools like 'echo' or 'hello_world', 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.

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 'echo' or 'hello_world'. There's no mention of context, prerequisites, or exclusions, leaving the agent with minimal usage direction.

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

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

No annotations are provided, so the description carries full burden for behavioral disclosure. The description offers no information about what the tool actually does, how it behaves, what it returns, or any operational characteristics. 'Simple hello world tool' doesn't explain whether this performs a greeting action, displays output, or has any side effects.

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

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

While technically concise with just four words, this is a case of under-specification rather than effective conciseness. The description fails to communicate essential information about the tool's purpose and behavior. Every sentence should earn its place, and this single sentence provides minimal value beyond what's already implied by the tool name.

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

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

Given no annotations, no output schema, and a description that provides almost no useful information, this is completely inadequate. The description doesn't explain what the tool does, when to use it, what it returns, or how it behaves. For even a simple tool with one parameter, this description fails to provide the minimal contextual information needed for an agent to understand and use the tool effectively.

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

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

Schema description coverage is 100% with the single parameter 'name' well-documented as 'Name to greet'. The description adds no additional parameter information beyond what the schema provides. With complete schema coverage, the baseline score of 3 is appropriate since the schema does the heavy lifting for parameter documentation.

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

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

The description 'A simple hello world tool' is a tautology that essentially restates the tool name 'hello_world' without specifying what the tool actually does. It mentions 'hello world' which implies greeting functionality, but doesn't clearly state the verb+resource combination or distinguish this from sibling tools like 'echo' or 'get_time'.

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

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. There's no mention of appropriate contexts, prerequisites, or comparisons to sibling tools like 'echo' or 'get_time'. The agent receives no help in determining when this specific greeting tool should be selected.

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