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

The ReadOnly annotation already covers the safety profile, so the description's added value is 'Prompt discarded' plus the schema's repeated 'discarded after' notes, which together disclose that this is a stateless, input-ignoring function that returns the same fixed template. That is genuinely useful context, but the description remains silent on output format, edge cases, and what a caller should expect to do with the result. No contradiction with annotations, though the prompt-enhancement annotations sit uneasily beside 'Prompt discarded'.

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 short sentences with zero filler; the primary action is front-loaded. The second sentence 'Prompt discarded' is cryptic but deliberate and earns its place as a behavioral disclaimer. It is efficient to the point of under-specification, which is the only reason it is not a 5.

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 tool an agent must decide to invoke, the description does not explain the template's purpose, content, or what value it provides, and there is no output schema to fill that gap. The agent cannot anticipate what 'three-step thinking template' will look like or why it would help. This is thin for a tool nested among many purpose-named siblings.

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?

All 7 parameters have rich descriptions in the schema (ref, url, city, feed, host, json, path), so baseline is 3. The prose description adds no parameter meaning beyond the schema, and it introduces the word 'prompt' which matches no schema property — a minor source of ambiguity. There is no compensation needed since schema coverage is 100%.

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?

'Return a three-step thinking template' states a specific verb, resource, and scope — the agent knows it will receive a small, fixed reasoning template. 'Prompt discarded' adds a distinguishing behavior, signaling this tool does not process its inputs the way siblings like validate-json or normalize-url do. It loses the 5 because it never says what the template is for or what a 'three-step thinking template' actually contains.

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?

There is no when-to-use guidance, no exclusions, and no named alternative. The 'desc contains say-when' annotation appears unsupported — 'Prompt discarded' describes behavior, not a condition for choosing this tool. An agent comparing against sibling tools like web-fetch or validate-json receives no basis for selecting think-steps.

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