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

Annotations already declare the safety profile (readOnlyHint=false, idempotentHint=true, destructiveHint=false), so the description need not restate safety. It adds the auth requirement, which is useful context, but says nothing about the effect of liking (e.g., duplicate-like handling) or the response. Note a mild tension: it says the api_key is 'required' while the schema allows omitting it when an Authorization header is set.

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?

Two short sentences, front-loaded with the action and resource, with zero filler. Every clause carries information.

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 action with full schema coverage, annotations, and no output schema, the description covers the essentials. It could be slightly more complete about the auth fallback and idempotent-like behavior, but nothing critical is missing.

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 (api_key, post_id) are already documented in the schema. The description only restates that the id is numeric and the key is needed, adding no syntax or format detail beyond the schema — baseline 3.

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 ('Like') and resource ('an Oids post'), identified by numeric id. It is clear what the tool does, though it offers no explicit differentiation from siblings like oids_publish_post or oids_read_timeline.

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 states a prerequisite (the user's API key) which is genuine usage context. However, it gives no guidance on when to like vs. other interactions, no exclusions, and does not mention the alternative auth path for the key.

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