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

Annotations already declare destructiveHint=true, idempotentHint=true, and readOnlyHint=false, but the description adds genuinely new context: the removal is immediate and removes the registration outright with no paused/soft state, and that removing a non-existent watch is not an error (reinforcing the idempotent contract). This goes beyond what the structured annotations convey.

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-loads the core action in the first clause, then adds useful behavioral constraints. The pricing sentence is somewhat tangential but relevant to agent budgeting; overall it is efficient and well-ordered.

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 destructive, idempotent mutation tool with no output schema, the description covers the key behavioral facts an agent needs (immediacy, no paused state, non-error on missing watch) and the annotations cover the safety profile. Pricing/plan info rounds it out; only explicit routing guidance 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 description coverage is 100%, so both parameters (slug, context) are already documented in the schema itself, including the reference to find_providers output format. The description adds no further parameter meaning, so the 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?

States a specific verb+resource ('stop watching a listing') that is the precise inverse of the watch_listing sibling, so an agent can immediately tell what it does and disambiguate from watch/list_watches operations.

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 clarifies an edge case ('removing a watch that was never registered is not an error') but never states when to prefer this tool over alternatives, nor any prerequisites. Usage is implied by the inverse relationship to watch_listing rather than spelled out.

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