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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so the bar is lower, but the description still adds real context: the report is cached, it includes timestamped findings and gate status, missing or failed QA blocks downstream actions, and API keys cannot override the gate. The last point is a genuine permission-semantics disclosure an agent could not infer from schema or annotations.

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?

It is short and front-loaded with the '[read-only]' marker, then the core action and its blocking behavior. The parenthetical API path is defensible for debugging but is the least essential element; otherwise no sentence is wasted.

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 rich annotations and no output schema, the description covers the essentials: what is returned (QA report, findings, gate), what a failure means (blocking), and an unusual auth constraint. Only the parameter's exact meaning and the rerun alternative are left unstated.

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?

There is one required parameter with 0% schema description coverage, so the description must compensate. The embedded API path 'GET /api/v2/content/{id}/qa' implies the id is a content identifier, but the description never states this directly or gives format expectations, leaving the parameter only partially explained.

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 names a specific verb and resource ('Reads the cached video/audio QA report') plus the payload contents (timestamped findings, approval/booking gate), which lets an agent distinguish it from media_qa_rerun. It does not explicitly name that sibling, so the read-vs-rerun contrast is only implied by the word 'cached'.

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?

Usage is implied rather than stated: 'Missing or failed QA blocks' and the approval/booking gate suggest the tool should be consulted before approving or booking content. There is no explicit when-to-use or when-not-to-use guidance, and no direct pointer to media_qa_rerun for refreshing a stale or missing report.

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