TestRail MCP Server

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

No annotations are provided, so the description carries the full burden. It only indicates this is a read operation via 'Retrieves' and implies bulk return with 'all'. It omits pagination behavior, rate limits, authentication requirements, and what happens if the projectId is invalid or empty.

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?

Efficiently front-loaded with the action verb. The bilingual format (English/Japanese) adds length but serves internationalization without redundant information. Could be slightly more information-dense regarding behavioral traits without sacrificing brevity.

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?

Adequate for a single-parameter retrieval tool with full schema coverage, but lacks output specification (expected fields, pagination structure) and error handling context. Given the lack of output schema and annotations, the description meets minimum viability but has clear gaps.

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% (projectId described as 'TestRail Project ID'). The description mentions 'specified TestRail project' which aligns with the parameter but adds no additional semantic details such as format constraints, valid ranges, or examples 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?

States a specific verb ('Retrieves') and resource ('test plans') with scope ('for a specified TestRail project'). Differentiates from siblings by targeting 'plans' specifically (vs cases, runs, etc.), though it does not explicitly contrast with singular/plural variants like getCase/getCases.

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?

Provides no guidance on when to use this tool versus alternatives such as getRuns, getCases, or addPlan. No prerequisites, error conditions, or 'when-not-to-use' advice is included.

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