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

readOnlyHint=true already tells the agent this is a safe, non-mutating call, so the bar is lower. The description adds useful scope about what the guide covers, but says nothing about the response form (single markdown blob? multi-page?), its likely size, or whether it is stable/cacheable — details that matter for a large document fetch.

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?

A single sentence that front-loads the resource and then packs the content inventory into a compact list. No filler, no restating of the title, and the parenthetical of languages is efficient rather than redundant.

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 no-parameter, read-only tool with no output schema, the description carries the burden of saying what comes back, and it does so by enumerating the guide's sections. The only gap is the response format and rough size, which an agent preparing for a large payload would want to know.

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 tool takes zero parameters, so there is nothing for the description to disambiguate beyond confirming that no arguments are needed. The empty schema is consistent with the description's framing as a one-shot guide fetch; baseline 4 applies for a 0-param tool.

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?

Uses a specific verb and resource ('The full Paxmod API guide') and immediately enumerates the contents an agent will get: endpoints, request/response shapes, error codes, rate limits, and code samples. It is unmistakably distinct from the sibling tools, which are all operational (create_test_api_key, moderate_text, test_policy, etc.).

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?

Names the intended audience ('for coding agents'), which implies the usage context, but gives no explicit when-to-use/when-not rule and does not reference any sibling tool as an alternative or follow-up. An agent can infer this is a documentation-lookup call, but the routing logic is left implicit.

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