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

Annotations already declare readOnlyHint, idempotentHint, and non-destructive behavior. The description adds that output differs by key presence, but the phrase 'briefing of its own kind' is opaque and it omits details such as how the key is supplied or what the response format looks like.

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 a single, front-loaded sentence with no filler. The content list is dense but every phrase contributes information about what the briefing contains.

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 adequately says what content is returned. It still leaves ambiguity around the key mechanism and the exact return format, which matters for an agent deciding how to invoke it.

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 input schema has zero parameters, so parameter semantics are inherently minimal and the baseline is 4. The description references a key, but since no key parameter exists in the schema, this is not a parameter-semantics gap.

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 identifies the resource (GET /instructions) and enumerates the briefing content it returns, which is clear enough to tell it is an instructions/help endpoint. It does not explicitly differentiate itself from siblings such as commercebook_feedback, but the purpose is not vague.

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 no-key versus key distinction implies usage: call without a key for the buyer briefing, with a key for a role-specific briefing. However, it never states when to use this tool instead of siblings like feedback or signup, so the guidance remains implicit.

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