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 but fails to specify critical mutation details: whether updates are partial (PATCH-like) or full replacement, what the response contains, side effects on associated test cases, or reversibility concerns.

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?

Extremely concise bilingual statement with zero redundancy. However, for an 8-parameter mutation tool with no output schema, the single-line format may be overly terse rather than efficiently structured.

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?

Inadequate for the complexity level: an update operation with 8 parameters and no annotations/output schema requires explanation of update semantics (partial vs full), error conditions, and return values. The description provides only the obvious function name expansion.

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, documenting all 8 parameters including the relationship between includeAll and caseIds. The description adds no additional parameter semantics, but meets the baseline expectation since the schema is self-sufficient.

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 action (Updates) and resource (test run), including the Japanese translation. It implicitly distinguishes from sibling update tools (updateCase, updateSuite, updateSection) by specifying 'test run' as the target resource.

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?

No guidance provided on when to use this versus addRun (creation) or getRun (retrieval), nor any mention of prerequisites like requiring the runId to exist. The description lacks when-to-use or when-not-to-use context.

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