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

Goes well beyond the annotations: the action is irreversible ('the notification email cannot be recalled after sending'), rate-limited ('at most 5 messages per account in 24 hours'), returns a feedback_id receipt, and fixes nothing. This explains why destructiveHint=true/openWorldHint=true apply, so no contradiction with the 'does not change calendars' reassurance.

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?

Front-loaded with purpose and scope, then progressively tighter rules. It is longer than average, but each sentence adds a distinct constraint (rate limit, consent semantics); little is redundant with the schema.

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 purpose, triggers, prohibitions, irreversibility, rate limits, and the consent parameter, and an output schema exists so return values need not be spelled out (feedback_id is still noted as a receipt). Nothing needed to invoke it correctly is 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?

Schema coverage is 100%, so the baseline is 3. The description still adds real meaning for contact_ok: it is consent rather than a promise of reply, defaults to false for every category including 'bug', and never subscribes the user to a newsletter - nuances the schema does not fully carry.

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: stores a user feedback message and notifies the Kalender Sync team. It also clarifies the negative scope ('does not change anything in the user's calendars'), which cleanly separates it from every calendar-mutating sibling like create_event or update_event.

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?

Explicitly names the triggering conditions (a wanted capability the tools lack, or something broken) and the hard precondition (only when the user explicitly asked or clearly agreed after being offered). It also states an exclusion: never on your own initiative and never include calendar content the user did not provide.

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