rate_limit_status

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

With no annotations, the description carries the full burden of behavioral disclosure. It reveals that the tool is non-consuming and auth-free, which are key behavioral traits. However, it does not describe the return format or any potential edge cases, so it is not a perfect 5. Still, it goes well beyond a bare statement.

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 two short paragraphs, each sentence earning its place. It states the main purpose first, followed by safety guarantees, then configuration source. No fluff or redundancy.

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 is simple (zero parameters, no annotations, no output schema), the description provides essential context: what it does, that it is safe, and how the configuration is set. It does not spell out the exact output shape, but for a status-reporting tool this is a minor gap. Overall, it is sufficiently complete.

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 has zero parameters, so the description need not explain parameter semantics. The baseline is 4 for such cases. The description adds value by referencing the related environment variables, TWIKIT_MCP_RATE_LIMIT and TWIKIT_MCP_RATE_LIMIT_PER_MINUTE, which provide context for how the reported configuration is populated.

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 "Report the current client-side rate-limit configuration," using a specific verb and resource. It is easily distinguishable from sibling tools, all of which perform Twitter API actions, whereas this tool reports internal rate-limiting state.

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 explicitly notes that the tool "Does not require auth and does not consume a rate-limit token," indicating it is safe to call anytime without side effects. It also mentions environmental configuration variables, but stops short of explicitly stating when to choose this over alternatives. For a status tool with no siblings, this is clear enough.

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