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

No annotations are provided, so the description carries the full behavioral burden and does not meet it. It never states that this is a destructive/irreversible mutation, whether it requires an authenticated account, how it behaves on non-watched companies, or whether it is idempotent. 'Remove' is the only hint of the mutation semantics.

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?

One short sentence, front-loaded with the action and object, with no filler. It is efficient, though its brevity is partly the source of the missing behavioral detail rather than purely a virtue.

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 output schema this is minimally adequate, but with zero annotations the description should at least flag the destructive nature and post-removal state. It omits anything an agent would need beyond the schema.

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% ('Companies House numbers to stop watching'), so the single parameter is fully documented structurally. The description adds no format, batch, or ordering detail beyond what the schema already provides, making the baseline 3 correct.

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?

Clear verb ('Remove') plus resource ('companies ... from your monitoring watchlist'), which an agent can distinguish from watch_add at a glance. It stops short of naming siblings or clarifying scope beyond the watchlist concept, so it is clear but not fully differentiated.

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?

No explicit guidance on when to use this versus watch_add/watch_list, no prerequisites, and no note about what happens if a company is not currently watched. Usage is only inferable from the verb.

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