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 offers almost nothing beyond the creation action. It fails to mention side effects (notifications sent?), idempotency (fails if name exists?), return values, required permissions, or reversibility—critical gaps for a mutation tool.

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 efficient: single sentence containing action verb, object, and domain context, plus Japanese localization. Every word earns its place with zero redundancy or boilerplate. Perfectly front-loaded with the essential action.

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 but minimal. While the input schema is fully documented, the description omits what the tool returns (plan ID? full object?), success indicators, or error scenarios. For a 5-parameter creation tool with no output schema and no annotations, this meets minimum viability but leaves operational 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 description coverage is 100% (all 5 parameters documented: projectId, name, description, milestoneId, entries). The description adds no additional parameter context, but with complete schema documentation, the baseline score of 3 is appropriate—no compensation needed, but no added value either.

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 explicitly states 'Creates a new test plan in a TestRail project'—specific verb (Creates), resource (test plan), and context (TestRail). It clearly distinguishes from siblings like addPlanEntry (adds to existing plans), addRun (individual test runs), and getPlans (read operation) by specifying this creates the top-level plan object itself.

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 explicit guidance on when to use this versus alternatives like addPlanEntry or addRun, nor does it mention prerequisites (e.g., existing project requirements). Usage is implied by the verb 'Creates' but lacks explicit when-to-use or when-not-to-use guidance.

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