Can the watched books exit? (free)

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

Annotations already declare readOnly/idempotent/no open world, and the description adds value beyond them: it discloses that it is headline-only, has 'blind spots', and carries no live execution model. That tells the agent what it cannot rely on, though it doesn't cover freshness or pagination.

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 fragments, front-loaded with the resource and its outputs, and the alternative is stated last. It is efficient, though the telegraphic jargon ('effective positions', 'days-to-exit brackets') trades some clarity for brevity.

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?

There is no output schema, and the description compensates by naming the fields returned. Combined with the disclosed blind-spot and no-execution-model caveats, an agent has enough to call it correctly, though return format details remain unstated.

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?

With a single parameter at 100% schema description coverage, the schema fully documents the optional cik filter and the all-filer default. The description adds no syntax or format detail beyond the schema, so the baseline of 3 applies.

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 the resource (watched-filer headlines) and enumerates the payload (effective positions, days-to-exit brackets, blind spots), which lets an agent distinguish it from unwind_stress. It lacks an explicit verb, but the name 'unwind_watch' plus the field list makes the function inferable.

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?

It states a scope limitation ('No live execution model') and points to an alternative ('unwind_stress has full scenario grids'), implying this is the lightweight/headline tier. There is no explicit 'use this when' clause, so it falls short of full when/when-not guidance.

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