Perplexity API Platform MCP Server

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

Annotations indicate readOnlyHint=true and openWorldHint=true, which the description doesn't contradict. The description adds value by specifying the model (sonar-reasoning-pro) and the purpose (reasoning tasks), but it lacks details on behavioral traits like rate limits, error handling, or response format beyond what annotations provide. No contradiction is present.

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 concise and front-loaded, consisting of two sentences that efficiently convey the core functionality and model used. Every sentence adds value without redundancy, making it easy for an agent to parse quickly.

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?

Given the tool's complexity (reasoning tasks with an API), annotations cover safety (readOnlyHint) and scope (openWorldHint), and an output schema exists, the description is reasonably complete. It specifies the model and purpose, but could improve by differentiating from siblings or adding more context on use cases.

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 fully documents the parameters (messages array and strip_thinking boolean). The description adds no additional meaning beyond what's in the schema, such as examples or usage tips for parameters. Baseline 3 is appropriate as the schema handles 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 'performs reasoning tasks using the Perplexity API' and 'returns a well-reasoned response using the sonar-reasoning-pro model,' which is a specific verb+resource combination. However, it doesn't explicitly differentiate from sibling tools like perplexity_ask, perplexity_research, or perplexity_search, leaving some ambiguity about when to choose this tool over others for reasoning tasks.

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 its siblings (perplexity_ask, perplexity_research, perplexity_search). It mentions the model (sonar-reasoning-pro) but doesn't specify use cases, exclusions, or alternatives, leaving the agent without clear context for selection.

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