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

With no annotations, the description carries the full behavioral burden and handles it well: it explains the null return for out-of-project executions, clarifies that retained=false means expiration rather than absence of ads, and reveals that sponsored ads are labelled separately from the organic answer.

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 sentences, no filler. The core action is front-loaded, followed immediately by the two most decision-relevant caveats and the routing hint. Every sentence earns its place.

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 single-parameter read tool with no output schema, the description is complete: it states what is returned, how results are structured, what null means, what retained=false means, and which sibling to use for aggregate metrics. An agent has enough context to call it correctly.

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 0%, so the description must compensate. It does by telling the agent exactly where to obtain executionId ('from devtune_list_visibility_responses'), which adds provenance beyond the bare UUID schema field.

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?

The description opens with a specific verb and resource: 'Read one retained AI response using an executionId'. It clearly distinguishes the tool from devtune_list_visibility_responses (bulk listing) and devtune_get_visibility_summary (rollup rates), so an agent can identify the correct tool without inspecting schemas.

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?

It explicitly states the executionId comes from devtune_list_visibility_responses, tells the agent when to use this tool versus the summary alternative ('Use visibility summary for rollup-backed advertising rates'), and includes a null-return caveat for executions outside the project.

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