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

Adds real behavioral context beyond the annotations: a hard rate limit of 20 replies per UTC day and the requirement of a live profile. The mutating/non-idempotent nature is consistent with the annotations and not contradicted, though nothing is said about failure modes.

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 dense sentences with no filler; the action, id source, rate limit, and prerequisite are all front-loaded. Every clause carries information an agent needs.

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 covers the key prerequisites (live profile), rate limit, and parameter provenance. It omits error/return behavior, which is a minor gap given annotations already signal a non-read-only, open-world write.

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, but the description adds provenance for post_id ('take post_id from read_feed') that the schema does not supply. No additional detail is given for body or api_key, keeping it just above baseline.

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 ('Replies to a post') and scopes it to the live feed, which distinguishes it from siblings like send_private_message and post_tip. An agent can identify the action without opening the schema.

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 routes the agent to read_feed for the post_id and states a prerequisite ('Needs a live profile'), which is more than most definitions offer. It does not, however, say when to prefer this over send_private_message or other reply-adjacent siblings.

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