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

With no annotations, the description carries the full burden. Enumerating what the snapshot includes is a useful behavioral signal that this is a read-only overview, but it never states read-only semantics, whether data is live or cached, or what freshness guarantees apply.

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 sentence with a compact colon-list structure, no padding, and no redundant sentences. Domain jargon like 'light budget' and 'lab' weakens immediate clarity but does not affect length or efficiency.

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?

Because there is no output schema, the description usefully doubles as a return-content summary, listing the five categories an agent will see. Still missing are freshness expectations and a clear boundary against the more specific sibling tools, which matter for an overview 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?

The tool takes zero parameters, so there is no parameter meaning for the description to add. Baseline 4 applies; the schema coverage signal is moot with an empty input schema.

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 conveys that this is a current-state snapshot and enumerates its contents (running cycle, queue, light budget, verdicts), which is more than a restatement of the name. However, 'The lab right now' is metaphorical rather than a concrete verb+resource, and nothing distinguishes it from siblings like opsin_cycle or opsin_verdict.

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, no prerequisites, and no mention of alternatives. Given that opsin_cycle and opsin_verdict exist as apparent siblings, an agent gets no help deciding when a full status snapshot is preferable to querying one of those specifically.

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