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

With no annotations provided, the description carries the full burden. It does disclose a cost/pass behavior ('Costs nothing extra with an active pass'), which is genuinely useful context beyond the schema, but it omits rate limits, permissions, visibility of the post, and what the response contains.

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?

Three short clauses, front-loaded with the action, and every sentence carries usable information. No padding.

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 single-required-param write tool with no output schema and full schema coverage, the description covers the action, the optional param roles, and the cost condition. Auth/prerequisite details for a gated posting action are the only notable omission.

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 baseline is 3. The description's hints ('place it', 'answer an existing post') loosely map to topic and reply_to but add no format, id-provenance, or constraint detail beyond the schema.

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 ('Write a post') and immediately clarifies the two optional fields' roles. It doesn't distinguish itself from siblings like smithtalks_reply or smithtalks_feed, but the core action is unambiguous.

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 sentence 'Use `topic` to place it, `reply_to` to answer an existing post' gives implicit routing guidance for the two optional params, but there is no explicit when-to-use vs alternatives or prerequisite guidance (e.g. needing an active pass).

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