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

Annotations declare readOnlyHint=false, openWorldHint=true, idempotentHint=true, and destructiveHint=true, and the description aligns with and reinforces these. The description adds meaningful context beyond annotations: it explains idempotency behavior in detail ('Repeated calls return or resume the same durable execution') and the execute=true default nuance. Not a 5 because it doesn't detail what destructive side effects occur or any specific auth/precondition requirements, but with the annotation set present, this is solid coverage.

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, dense paragraph of four sentences, each adding value: purpose, MCP semantics, brief_id scoping, and idempotency. It's front-loaded with the core purpose. Slightly less than a 5 because the MCP-phrase guidance is embedded in the middle rather than separated, and could be tightened, but there's no waste.

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 2-param tool with 100% schema coverage and no output schema (so no need to describe return values), the description covers purpose, idempotency, parameter semantics, and usage context. The only minor gap is not explaining what 'execute' actually does post-confirmation (what gets generated/started) or any rate-limits/duplication risks. Given the tool's simplicity, this is well-complete.

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%, so the baseline is 3. The description adds some context for the 'execute' parameter by explaining the MCP-default behavior, and clarifies the brief_id type (visible persisted brief). However, it doesn't add much beyond what the schema's own parameter descriptions already state; the schema description of 'execute' is quite thorough already. Baseline 3 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 clearly states what the tool does: 'approve and idempotently execute a visible persisted Uwear brief.' It uses a specific verb+resource combination and distinguishes itself from siblings like propose_brief and update_brief by focusing on the confirm+execute action. The brief_id scoping ('visible/latest BriefProposal') further disambiguates it.

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 explicit guidance on MCP phrasing that should map to execute=true ('Confirm', 'looks good', 'run it', 'start', 'generate') versus when to set execute=false ('only when the user explicitly wants to save approval without starting generation'). It also references the related brief_id source (visible/latest BriefProposal), guiding which ID to use. This is explicit, actionable guidance.

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