update_thread

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It states a mutable action but does not clarify whether content is replaced wholesale, how the optional member_name affects the thread, or any permission, idempotency, or failure behavior. 'Update an existing thread with new content' is too thin for a mutation with optional side-effect parameters.

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 no filler or repetition. It is appropriately sized, though it could have used the available space to clarify behavior rather than remaining minimal.

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?

There is an output schema and fully documented parameters, but the description omits important contextual nuance: what happens to existing content, how member_name interacts with 'new content,' and whether omitted optional fields reset or preserve prior values. For a mutation tool with no annotations, this is a notable completeness gap.

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%, so the schema already documents thread_id, content, and member_name. The description adds no extra meaning beyond the schema, so the baseline of 3 is appropriate.

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 a specific action ('Update') against a specific resource ('an existing thread') with 'new content.' This distinguishes it from siblings like start_thread, read_thread, and list_threads, though it does not name them explicitly.

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 phrasing implies when to use it: when updating an existing thread rather than creating, reading, or listing. However, it gives no explicit guidance about when not to use it or which sibling alternative to choose in ambiguous cases.

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