Leapfrog MCP

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

With no annotations provided, the description carries the full burden. It successfully discloses the runtime requirement (LEAP_TRACE=true), the output format (Playwright trace), and the consumption method (view at trace.playwright.dev with detailed timeline). It does not mention side effects or idempotency.

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?

Three well-structured sentences with zero redundancy. The first sentence establishes purpose, the second gives prerequisites, and the third explains output consumption. Every sentence earns its place.

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?

Despite lacking an output schema, the description adequately explains what the tool returns (trace file) and how to use it (viewing URL). Given the single parameter and no complex annotations, this is sufficient context for an AI agent to invoke the tool correctly.

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 schema has 100% description coverage for its single parameter (sessionId). The description implicitly contextualizes this parameter by mentioning 'for a session,' but does not add semantic details beyond what the schema already provides. Baseline 3 is appropriate 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 specific action (export), the exact resource type (Playwright trace file), and the target (session). It naturally distinguishes from siblings like 'session_export' (generic) and 'session_replay' (internal playback) by specifying the Playwright format.

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?

It provides a clear prerequisite ('Requires LEAP_TRACE=true'), which helps determine when the tool is available. However, it lacks explicit guidance on when to choose this over sibling alternatives like 'session_export' or when not to use it.

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