Decide Test MCP

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

With no annotations provided, the description carries full burden for behavioral disclosure. It mentions 'using Playwright' which implies browser automation, but doesn't describe what happens during execution (e.g., whether it returns results, logs, or failures), what gets created/destroyed (browser instances), authentication needs, timeouts, or error handling. For a complex execution tool with nested objects, this is inadequate.

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 appropriately concise with two sentences that directly state the tool's function. It's front-loaded with the core purpose. However, the second sentence 'Takes a test case and specific steps to execute' could be more integrated with the first for better flow.

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?

For a complex execution tool with 6 parameters (including nested objects), no annotations, and no output schema, the description is insufficient. It doesn't explain what the tool returns (test results? status codes?), error conditions, or behavioral expectations. The agent would struggle to understand how to properly invoke this tool and interpret its results.

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%, so the schema already documents all 6 parameters thoroughly. The description mentions 'Takes a test case and specific steps to execute' which aligns with the test_case and steps parameters but doesn't add meaningful semantic context beyond what the schema provides. Baseline 3 is appropriate when schema does the heavy lifting.

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's purpose: 'Execute predefined web test steps using Playwright' specifies the verb (execute), resource (web test steps), and technology (Playwright). It distinguishes from siblings like execute_api_test by specifying 'web' testing, but doesn't fully differentiate from run_generated_tests which might also execute tests.

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. With siblings like execute_api_test (for API testing), run_generated_tests (for running tests), and get_web_test_guidance (for guidance), there's no indication of when this specific web test execution tool is appropriate versus those other options.

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