playback_status

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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered by structured data. The description adds some value by signalling that the read includes frame coverage and stop verification, but says nothing about whether it is live or cached, whether it blocks, or how fresh the reported state is.

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?

A single front-loaded sentence with no filler or repetition. It loses a point only because the compressed phrasing ("owned native playback observations") trades clarity for brevity rather than earning concision.

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 zero-parameter status tool with no output schema, the description carries the full burden of describing what comes back, and it only gestures at three items (observations, frame coverage, stop verification) without any indication of the shape or key fields. It is adequate to know this is a playback status read but not complete enough to know what an agent can act on.

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?

The tool takes zero parameters and the schema has additionalProperties=false, so there is no parameter semantics for the description to explain. Baseline 4 applies; the description correctly avoids inventing inputs.

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?

"Read ... playback observations, frame coverage and stop verification" gives a verb and a resource and implicitly distinguishes this status read from the playback_start/playback_stop control siblings. However, the qualifiers "owned" and "native" are unexplained jargon, and the phrase "observations" leaves it unclear whether this returns live state, a captured snapshot, or a verification verdict. An agent can guess the category but not the content.

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 guidance and no named alternatives. The mention of "stop verification" hints that it is meant to be read after playback_stop, but that sequencing is never stated, nor is it said how this differs from checkpoint_status, recovery_status, or transaction_status in the same sibling set.

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