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

The annotations already establish that this is a safe, idempotent read. The description adds useful context beyond annotations: there is no charge, the response includes the saved spec across all three layers plus handoff files, and missing specId switches to a recent-specs listing. Auth and rate-limit behavior are not covered, but for an annotated read tool this is solid.

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 short sentences with little waste. 'No charge' is front-loaded rather than the core action, and the phrasing is slightly fragmentary, but the rest is dense and directly useful.

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 low-complexity read tool with annotations and no output schema, the description covers the essential selection behavior and return scope. 'All three layers' is not defined, but the agent has enough to invoke the tool correctly, especially with the schema indicating the optional specId.

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 only one optional parameter and schema description coverage is 0%. The description compensates by explaining the key conditional behavior: without specId it lists recent specs, implying that with specId it retrieves the corresponding saved spec. It does not explicitly describe specId's format or constraints, though the schema pattern provides the format.

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 identifies the resource clearly: the saved spec, all three layers, and handoff files, with a listing mode when no specId is supplied. It is specific enough to distinguish a spec retrieval from most siblings, though it does not explicitly differentiate itself from get_files or get_status.

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 explains one behavioral condition, that omitting specId lists recent specs, but gives no guidance on when to choose this tool over siblings such as get_files, get_status, or draft. The agent can infer retrieval usage but is not told when not to use it or which alternative applies.

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