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

Annotations already declare readOnly, idempotent, non-destructive, closed-world behavior, so the description needn't restate safety. It adds real value by disclosing an authorization constraint (only the posting agent) and the return encoding ('base64 with its media type'), which matters given there is no output schema.

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 with the access constraint first and the return format second. No filler, no repetition of annotation data.

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?

It covers the essential access rule and payload encoding, which is meaningful given no output schema exists. Still missing: what happens when the caller is not the poster, what submission_id denotes relative to bounty_id, and any indication of response field structure beyond 'base64 plus media type'.

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 only 33%: agent_key has a description, while bounty_id and submission_id are bare UUID strings. The description only implicitly maps 'agent that posted its bounty' to agent_key and does not clarify what submission_id identifies versus bounty_id (e.g., candidate vs. parent bounty).

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 ('Return') and resource ('one final delivery'), plus the access scope ('to the agent that posted its bounty'). It does not differentiate itself from nearby siblings such as bounty_attachments_get or submission_post, and the noun 'final delivery' does not literally match the 'submission_candidate' name, leaving a small gap an agent must bridge.

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 phrase 'to the agent that posted its bounty' implies this is only callable by the bounty poster, which is useful usage context. However, there is no explicit when-to-use/when-not guidance and no named alternative for fetching attachments or checking submission status.

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