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

The annotations (readOnlyHint=false, destructiveHint=false) are consistent with the description, so there is no contradiction. The description adds valuable behavioral context beyond annotations: the systemic side effect of forcing the policy across all keys ('overriding each key's own setting'), the security motivation ('potentially a third party who found it'), the leak scenario, and the null-clearing revert behavior. It's a thorough disclosure of side effects and permission requirements for mutating tool.

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 well-organized and front-loaded: statement of what, scope/impact, tri-state values, and authorization. Each sentence earns its place. It loses a point for the redundant opening sentence pair ('Set Workspace Third-Party Disabling Policy. Set the workspace-wide Third-Party Disabling policy.') which could be trimmed to one. Otherwise, the prose is tight and logically ordered.

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 with modest complexity (2 params, no nested objects, no output schema required), the description covers the essential decision-relevant semantics: scope, tri-state behavior, override semantics, and admin-only access. The description fully addresses the non-trivial policy nuance. Minor gaps: nothing about error cases, response, or the `account` parameter, but these aren't critical for the core use case.

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?

With 0% schema coverage, the description carries full burden for parameter explanation. It does an outstanding job with `third_party_disable_allowed`, clearly explaining true/false/null semantics and consequences. However, the `account` parameter is never mentioned or disambiguated, leaving a gap for one of the two parameters. Given the description excellently compensates for the most semantically complex parameter but misses `account`, a 4 is appropriate.

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 uses a specific verb+resource ('Set Workspace Third-Party Disabling Policy') and clearly scopes what the tool does: it forces the third-party disabling policy for every API key in the workspace. It distinguishes itself from possible siblings (like elevenlabs_disable) by explaining this is a workspace-wide override of per-key settings. The opening two sentences are mildly redundant, but the rest adds real clarity about the force/override behavior.

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 provides clear when-to-use guidance by explaining the tri-state semantics: true to allow for all keys, false to forbid for all keys, and null to clear the override and restore per-key values/plan defaults. It also adds the 'Workspace admins only' permission qualifier. It doesn't explicitly name alternative tools (e.g., a per-key settings tool), but the context strongly implies when this workspace-wide tool is appropriate versus per-key configuration.

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