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

With annotations declaring idempotent/openWorld/non-destructive, the description still adds substantial context: login required, writes only the override layer (not homepage/company/product), existing files are protected from text replacement, sensitive fields are never memorized, and the response returns only keys without echoing values.

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?

Dense but well-structured with bracketed markers, front-loading the login requirement and the primary action before the chain and exclusions. Every sentence carries operational value, though the block is lengthy and slightly crowded for a single-parameter tool.

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 one-parameter mutation with no output schema, the description covers prerequisites, the workflow it belongs to, adjacent-tool boundaries, data-sensitivity rules, and the return shape (keys only). Nothing an agent needs to invoke it correctly appears to be missing.

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?

Top-level schema coverage is 0%, but the description compensates by mandating that keys come from get_signup_activity/get_signup_gaps and must not be invented, and that only text is accepted. This meaningfully clarifies the key/value semantics beyond the nested schema descriptions, though it does not cover limits such as the 80-item or length bounds.

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?

States a specific verb and resource: saving user-provided general signup answers into the cross-form reuse layer, which subsequent signups auto-fill. It explicitly distinguishes itself from update_my_profile (homepage) and prepare_signup_file_upload (attachments), so an agent can route correctly without opening schemas.

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?

Gives an explicit composition chain (get_signup_gaps.missingCombined → ask user → this tool → submit_signup per event) plus named alternatives for adjacent needs (update_my_profile, prepare_signup_file_upload). It also states exclusions: sensitive questions like ID documents must not be written here.

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