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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered; the description adds genuinely new context by disclosing that calls are paid via x402 and that the returned evidence covers revocation, missing/outdated certificates, level, key, and forged-signature attempts in the last hour. It does not state rate limits, caching of the 'last hour' window, or what happens when payments are off beyond a pointer to quantum_pricing.

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?

One dense sentence front-loads the core question and then lists the diagnostic reasons, with the payment caveat trailing in parentheses. It is efficient, though the middle enumeration makes it slightly run-on.

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 read-only, single-parameter tool with no output schema, the description supplies the return-value semantics (the enumerated failure reasons) that would otherwise be missing. What remains unstated — response shape beyond the reason list and billing fallback behavior — is minor.

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% with a single required agent_id already described as "A Quantum Agent id," so the schema carries the parameter burden. The description adds no format, scoping, or example information for agent_id, which is the expected baseline-3 outcome for high coverage.

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 question the tool answers ("whether an agent would pass the checkpoint right now and why not") plus the resource (an agent identified by agent_id), which is clearer than a bare status verb. It does not name or differentiate itself from the many inspector_* siblings (check, grade, pass, report, patrol, watchlist), so the agent must infer the boundary.

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 implied by "right now" and the enumerated failure reasons, suggesting a live eligibility check, and it points to quantum_pricing for payment details. However, there is no explicit when-to-use versus inspector_check, inspector_grade, or inspector_report, and no stated prerequisites for the caller.

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