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

Annotations already declare readOnlyHint=false, destructiveHint=false, and idempotentHint=false, so the write and repeatability profile is covered. The description adds genuinely useful data-minimization context ('does not store commands, env, or keys') and the auth requirement. It does not say what happens to existing watchlist entries on re-import, which is the main behavioral unknown for a non-idempotent write.

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?

Three short sentences with no filler, and the substantive behavior comes early. The opening token-scheme fragment is arguably lower value than the import behavior that follows it, so front-loading could be tightened.

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 four-parameter mutating import with no output schema and no required fields, the definition covers inputs (config formats) and side effects (watchlist write, what is not persisted) but leaves the all-optional parameter interplay and duplicate-handling behavior undefined. Adequate but incomplete for the tool's complexity.

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 50%: the token parameter is documented in-schema, and the description clarifies that the config payload is either an mcp.json object or a host-list string. However, the roles of the similarly-named 'text' and 'source' parameters are left unexplained, and it is unclear whether 'text' is an alternative to 'config'. Partial compensation for the coverage gap, no more.

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 names a concrete verb and outcome: it reads hostnames from an mcp.json or a host list and saves them to the Desk watchlist for a plan. That is specific enough to separate it from single-entry siblings such as watch_add. The leading fragment 'Plan bearer token, never x402' is about auth scheme rather than purpose and slightly muddies the opening.

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?

There is no explicit when-to-use statement, no exclusion, and no named alternative among the many watch_* and preflight siblings. An agent can infer this is a bulk alternative to watch_add, but the definition never says so. The 'never x402' remark is an auth constraint, not usage routing.

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