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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered. The description adds the shape of returned events (event types plus actor email, note, timestamp), but does not mention ordering guarantees, pagination, or whether the timeline is complete or truncated — and with an output schema present, the field listing is partially redundant.

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?

A single front-loaded sentence stating the resource first, then the returned event vocabulary and fields. No filler, no repetition of the title.

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 two-parameter read with full schema coverage, annotations, and an output schema, the description supplies enough to call it correctly. The only gap is the absence of any guidance on when this is the right tool versus related post-inspection tools.

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 coverage is 100%, and both postId and organizationId carry full descriptions including the multi-org conditional. The description adds no additional meaning about either parameter, so the baseline 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?

The description gives a specific verb and resource ("Return the approval timeline of a post") and enumerates the event types returned, so an agent knows exactly what data comes back. It does not explicitly contrast with adjacent siblings such as resend_approval or get_post, relying on the distinct 'timeline' framing to differentiate.

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?

Usage is only implied: the agent can infer this is the read-only lookup for a post's approval state, but there is no explicit when-to-use, no mention of prerequisites (e.g., the post must be under approval), and no pointer to alternatives such as get_post for general post data.

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