Playwright MCP Server

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 but offers minimal information. It states it performs an HTTP PUT request but doesn't describe what that entails operationally - no mention of idempotency, authentication requirements, error handling, response formats, or side effects. For a mutation tool with zero annotation coverage, this leaves significant behavioral gaps.

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 maximally concise with a single, clear sentence that states exactly what the tool does. There's no wasted language, repetition, or unnecessary elaboration. It's front-loaded with the essential information and doesn't bury key details.

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 an HTTP PUT tool (a mutation operation) with no annotations and no output schema, the description is insufficiently complete. It doesn't address critical context like what PUT means semantically, what happens on success/failure, authentication requirements, or response format. The agent would need to make assumptions about this tool's behavior in important scenarios.

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 description adds no parameter information beyond what's already in the schema (which has 100% coverage). Both 'url' and 'value' parameters are fully documented in the schema with clear descriptions. The description doesn't provide additional context about parameter usage, formatting requirements, or examples, so it meets but doesn't exceed the baseline for high schema coverage.

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 ('Perform an HTTP PUT request') with the specific HTTP verb 'PUT', making the purpose immediately understandable. It distinguishes from siblings like playwright_get, playwright_post, and playwright_delete by specifying the HTTP method. However, it doesn't mention what resource is being operated on beyond the generic 'HTTP request', which prevents a perfect score.

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. It doesn't explain when PUT is appropriate compared to POST or PATCH, nor does it mention any prerequisites or context for usage. The agent must infer usage from the HTTP method alone without any explicit direction.

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