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

With no annotations, the description carries the full burden, and it does disclose the return shape (status, changed flag, new hash) — valuable since there is no output schema. However, it omits that this triggers an outbound fetch and rewrites the stored hash, whether it counts against rate limits, and what happens for an invalid or deleted watch id.

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?

Two short sentences with zero filler, and the core action is front-loaded before the return-value clause. Every sentence carries information an agent needs.

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 single-parameter tool with no annotations and no output schema, the description covers purpose and return values adequately. The remaining gap is failure/edge-case behavior and any side effects on the stored watch state, which is minor but not negligible.

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% and the single parameter is already documented as 'Watch id from watch_create', so the description need not repeat it. The description adds no further meaning about the id, which is acceptable at this coverage level but earns only the baseline.

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 ('force an immediate re-fetch of a watch') plus the exact behavior it replaces ('instead of waiting for its interval'). That framing distinguishes it cleanly from watch_diff, watch_history, and watch_list without needing to name them.

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 phrase 'instead of waiting for its interval' gives clear usage context: call this when you need current content now rather than on schedule. It stops short of naming when-not-to-use conditions or the sibling tools that answer adjacent questions (e.g. watch_diff for comparison).

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