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

Goes well beyond the annotations by describing the default hold-and-approve flow, returning {status: 'pending_approval', approval_id}, and the exception requiring a signing-key-proving connection. It also discloses duplicate behavior ('the same comment sent twice is posted twice'), consistent with idempotentHint=false, and confirms append-only behavior.

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?

Front-loaded with the purpose, followed by availability, default behavior, and constraints in a logical order. The sentences are dense but nearly all carry needed information; some phrasing ('on any plan', the long signing-key clause) is heavier than necessary.

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 mutation tool with no output schema, the description supplies the missing pieces: the return payload, the approval lifecycle, the follow-up tool, and the idempotency caveat. An agent has everything needed to call it and to explain the result to a user.

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 both parameters are already documented in the schema with format, length, and content guidance. The description adds only loose semantics about what the comment text should contain, so the baseline of 3 applies.

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?

States a specific verb and resource ('Requests a comment on one action item's timeline') and scopes the content type with concrete examples (what was done, what was found, what is needed). It is clearly separable from siblings like update_action_item and list_action_items, and the later line 'this cannot edit or delete anything or change the item's status' reinforces the boundary.

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?

Explicitly states the permitting condition (only a connection an account admin set up and allowed) and the exclusion (a connection made through an assistant's sign-in cannot, on any plan). It also names get_approval_status as the tool to use for the approval outcome, leaving little to inference.

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