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

Annotations already declare readOnlyHint=true, idempotentHint=true, openWorldHint=false, and destructiveHint=false, so the operation's non-mutating behavior is well covered. The description adds useful context about canonical content and ID sourcing, but does not describe return shape, error behavior, or what happens for unknown issue_ids.

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, each earning its place: the first defines the tool's purpose and output contents, the second gives the source of the parameter, and the third notes the resource-template alternative. No filler or repetition.

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 read-only single-parameter tool with rich annotations and no output schema, the description provides enough context to call it correctly: what it returns, how to obtain the issue_id, and an alternative access path. 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 100% for the single parameter, including examples and an explicit match to the fixId field. The description essentially reinforces this same guidance rather than adding new semantic meaning beyond the schema, so the high-coverage baseline of 3 applies.

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 uses a specific verb and resource: 'Read the canonical fix record for one GVT issue type' and enumerates the exact contents returned. It clearly distinguishes this from siblings by scoping it to a single fixId, while noting where those IDs come from.

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 description explicitly tells the agent where to get the required issue_id: from the fixId field on issues in gvt_get_test_results output. It also notes that resource-capable clients can access the same content via a gvt:// resource template, providing an alternative without explicitly naming a sibling tool.

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