TestRail MCP Server

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

With no annotations provided, the description carries full burden but discloses no behavioral details beyond the mutation itself. It doesn't specify what is returned (despite no output schema), whether adding to an existing result overwrites or errors, or side effects like notifications triggered in TestRail.

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 single sentence, front-loaded with the action. The bilingual text adds length without value for English-only agents but doesn't significantly detract from clarity. No redundant or filler content.

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 simple mutation tool with well-documented parameters, but lacking given zero annotations and no output schema. Should indicate what the tool returns (e.g., the created result object/ID) or link to related query tools like 'getResultsForCase'.

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%, establishing a baseline of 3. The description adds no additional semantic context beyond the schema (e.g., doesn't clarify that statusId uses TestRail's internal enumeration, though the schema documents this). It doesn't compensate for any schema gaps because none exist.

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 ('Adds'), resource ('test result'), and scope ('specific test case in a test run'). The use of 'specific' implicitly distinguishes this from the sibling batch tool 'addResultsForCases', though it doesn't explicitly name the alternative.

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 singular version versus the batch 'addResultsForCases', or prerequisites like requiring valid runId/caseId. No mention of error conditions or when results should be updated versus added.

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