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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world, so the safety profile is covered structurally. The phrase 'deterministic signed assessment' hints that output is a signed verdict, which is slight added value, but it says nothing about what the assessment rejects, what it returns, or any failure semantics.

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?

It is short, but that brevity comes from under-specification rather than economy. The single clause is front-loaded but conveys almost no actionable information.

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?

Although an output schema and rich annotations exist, the description never states what guarantee the tool provides among a crowded family of guard/preflight tools. For a credential-scope assessment tool an agent cannot confidently place, this is inadequate.

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 description coverage is 100% and the example payload shows credential.scopes/expires_at/credential_id and action.required_scopes, so the schema carries parameter meaning; the description adds nothing beyond 'supplied input.' Baseline 3 applies per high schema 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?

The description largely restates the title ('Delegated Credential Guard') and adds only 'deterministic signed assessment over supplied input,' which is abstract jargon rather than a specific verb+resource. It never says whether this guards credentials, validates scope, or emits a signed verdict, and with ~35 similarly named siblings it offers no differentiation.

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 guidance on when to invoke this versus siblings like delegation_scope_guard or tool_call_policy_guard, no prerequisites, and no exclusions. An agent has nothing to route on.

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