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

Annotations already declare the safety profile (non-readOnly, non-destructive, open-world), so the description's added value is real: it discloses that recording blocks freeze, the session and device stay alive, and that simulated/playback sessions record no data while paused. It omits error behavior (pausing a non-running session) and any permission requirements.

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 front-loaded sentence carries the core action, with the parenthetical and trailing clause reserved for consequence detail. It is dense but every clause earns its place; slightly heavier punctuation than ideal for a one-parameter tool.

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?

An output schema exists, so return values need no explanation, and the annotations cover safety. The description covers state effects and the resume path, but leaves precondition failure modes and required authorization unstated for a state-changing session tool.

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?

There is a single parameter and schema description coverage is 100%, so the schema fully documents session_id on its own. The description adds nothing about the parameter (e.g. where to obtain the session_id or what happens with an invalid one), 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 and resource ('Pause a running protocol session') and immediately contrasts with the sibling that reverses it ('resume with protocol.resume'). An agent can distinguish this from protocol.stop and protocol.resume without opening any 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?

It gives clear context for use (pausing a running session) and points to protocol.resume as the follow-up action, which is genuine routing guidance. It never states the inverse condition — e.g. when to prefer protocol.stop over pausing — so the 'when-not' half is left implicit.

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