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

The description adds rich behavioral detail beyond annotations: status transitions (delivered→DELIVERED, failed→DELIVERY_FAILED, abandoned→no-op), rejection of failed on already-DELIVERED records, per-item independence, and the external-world warning that organizers can see the report. No contradiction with the idempotent/readOnly/destructive hints.

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 dense but organized with labeled sections and numbered pitfalls. The trigger and chain are front-loaded, and every sentence contributes a decision rule without filler.

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?

Covers prerequisites, the calling sequence, batch limits, per-item error isolation, return-field hints such as results[].applied and reason values, and follow-up verification. Even without an output schema, the agent has enough to call and interpret the tool correctly.

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%, but the description adds substantial meaning: the effect of each status enum value, the key-only rule for changedKeys, the 10-max batch limit, and the behavior of an abandoned report with no note. This goes well beyond the raw schema.

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 states a specific verb and resource: reporting the delivery outcome of an external signup form after submit_signup returns delivery.kind='webview'. It also names the exact user statements that trigger the tool, distinguishing it from submit_signup and list_my_signups.

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?

It gives an explicit chain: submit_signup → user fills browser form → this tool reports → list_my_signups verifies status. It also explicitly routes answer updates to update_my_signup_profile and warns not to guess user outcomes.

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