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

Annotations already disclose read-only, idempotent, and non-destructive behavior. The description adds that the result is deterministic and signed, which is useful but minimal; it does not explain what input is accepted, what the assessment contains, or whether any external state is involved.

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 short and wastes few words, and the key functional hint 'deterministic signed assessment' is front-loaded. However, the leading phrase 'Delegated Credential Guard' simply duplicates the tool name and adds no 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?

Despite having an output schema and annotations, the description leaves the tool's core semantics undefined: what a delegated credential assessment is, what inputs are expected, what output shape or meaning results, and when an agent should prefer it over similar guards. This is too sparse for safe autonomous invocation.

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 schema names two required inputs, `credential` and `action`, but provides no property definitions or descriptions. The description does nothing to clarify what format these should take, what 'action' means, or how they relate to the assessment, so an agent cannot reliably construct a valid call.

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 merely pairs the tool name with a generic phrase, 'deterministic signed assessment over supplied input,' without stating what kind of credential or action is assessed, what the guard actually does, or what makes it different from the many sibling guard/assessment tools. It restates the title and adds only vague functional language.

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 use this tool, when not to use it, or which sibling tools are alternatives. The description gives an agent no contextual signal to distinguish delegated_credential_guard from delegated_spend_policy, delegation_scope_guard, or attest.

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