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

readOnlyHint=true already covers the safety profile, so the bar is lower. The description still adds real value by disclosing the return shape (full Markdown plus front matter with dates, review status, license), which the annotations do not convey; it only omits what happens when the id is missing.

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?

Two sentences, zero filler: the return payload is stated first, the accepted input forms second. Every clause earns its place and nothing is repeated from annotations.

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 single-parameter read tool with no output schema, the description supplies exactly what the agent needs: what comes back and what inputs are valid. Only edge-case behavior (unknown id, malformed URL) is left unstated, which is a minor gap given the simplicity.

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 coverage is 100%, so a baseline of 3 applies, but the description goes beyond the terse schema text by naming a concrete example id ('jb-jwks') and reiterating that a canonical URL is acceptable. That concretely disambiguates the accepted input forms.

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?

States a specific verb ('returns') and resource ('full Markdown of one entry'), and the singular scope makes it separable from search_site, list_topics and get_findings without opening a schema. It stops short of explicitly naming which sibling to use instead, so it falls just shy of a 5.

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?

Usage is only implied: an agent can infer this is a direct single-item lookup rather than a search or listing. There is no explicit statement of when to prefer this over search_site, nor any prerequisite or failure condition for an unknown id.

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