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

With no annotations, the description carries the burden and does good work: it discloses the posting identity (fund persona vs username), a 500-char cap, and a 10 replies/minute rate limit. It doesn't cover error conditions or reversibility, but the side-effect profile is clearly communicated.

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?

Behavioral constraints are front-loaded in the first two sentences, followed by a tight Args block. Every sentence earns its place with no redundancy.

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 mutation with an output schema already defined, the description supplies identity, limits, and parameter sourcing. It could add a note on failure modes or delete_reply as the undo path, but nothing essential 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 coverage is 0%, so the description must compensate, and it does: action_id is explicitly sourced ('the post's id from read_feed') and text is characterized as the reply body with a 500-char limit. Both required parameters gain meaning beyond the bare schema types.

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 ('Reply under a feed post') that clearly separates it from siblings like read_feed, get_replies, and like_post. An agent knows exactly what action this performs 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?

Points the agent to read_feed as the source of action_id, which is useful context, but there is no explicit when-to-use vs alternatives (e.g., get_replies to read, delete_reply to undo) or when-not guidance. Usage is implied rather than stated.

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