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

With no annotations, the description carries the burden and delivers two non-obvious facts: missing members are silently ignored (idempotent, no error on stale ids) and the call is free at 0 credits. It omits permission requirements and whether the segment is recomputed after removal, keeping it short of a 5.

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 sentences, zero filler, action front-loaded before the caveat about ignored members and the cost note. Every clause carries information an agent can act on.

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 simple two-parameter removal with no output schema, the description covers what the tool does, the idempotency behavior, and the cost. The only real gap is the absence of any statement about what is returned or whether it is a bulk partial-success operation.

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% — segment_id and person_ids (with the 1-1000 bound) are already documented. The description only restates that removal is keyed by person_id, adding minimal meaning beyond the schema, so the baseline 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?

States a specific verb (remove) and resource (people from an audience segment), plus the key identifier (person_id). The polarity is unmistakable against sibling add_to_segment, so an agent can route correctly without inspecting either schema.

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?

Usage is implied by the verb and the mention of a target segment, and 'costs 0 credits' helps when weighing against paid alternatives. It never explicitly states when to prefer this over add_to_segment or remove_from_collection, or whether the segment must already exist.

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