TestRail MCP Server

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

With no annotations provided, the description carries the full burden of behavioral disclosure. While 'Retrieves' implies a read-only operation, the description fails to disclose error handling (e.g., what happens if the ID is not found), idempotency, authentication requirements, or return value structure.

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?

The description is efficiently structured as a single sentence (presented bilingually), front-loaded with the core action and object. There is no extraneous information, though the dual-language presentation adds slight redundancy for an AI agent without harming clarity.

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?

Given the low complexity (single required parameter, no nested objects) and 100% schema coverage, the description is minimally adequate. However, without an output schema, the description could have improved completeness by briefly indicating what 'details' are returned (e.g., status, configuration, results count).

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?

The input schema has 100% description coverage ('TestRail Run ID'), establishing a baseline of 3. The description mentions 'by ID' which aligns with the parameter but adds no additional semantic context such as format details, examples, or constraints beyond what the schema already provides.

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 clearly states the tool 'Retrieves details of a specific test run by ID', providing a specific verb (retrieves), resource (test run), and scope (by ID). However, it does not explicitly differentiate from sibling 'getRuns' (plural) beyond implying single-item retrieval via 'specific'.

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 provides no guidance on when to use this tool versus alternatives like 'getRuns' or 'getResultsForRun', nor does it mention prerequisites or conditions for use.

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