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

Annotations already declare readOnlyHint/idempotent/non-destructive, and the description goes further by disclosing side-effect economics (no measurement started, no credits charged), a call-ordering dependency, and an injection-safety note that beat-sheet text is data not instructions. Missing details like auth requirements or failure modes keep it from 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?

Three short sentences, zero filler, with the read-only/no-credit guarantee front-loaded and the prerequisite and safety caveat following in priority order. Every sentence earns its place.

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 not be explained, and the description still usefully previews the beat-sheet content and the credit/measurement guarantee. The only real gap is the undocumented upload_id, which leaves the agent without guidance on the one thing it must supply.

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 0% and the single parameter upload_id is never mentioned in the description, so nothing explains that it identifies the analysis to read or what form it takes (a UUID). With coverage this low, the description is expected to compensate and does not.

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 (Read) and resource (an existing video analysis and its measured bundle), and immediately constrains scope with 'without starting measurement or charging credits'. This distinguishes it cleanly from save_video_analysis and get_video_analysis_bundle, both of which are named or implied.

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?

Gives a clear selection condition (use this to read without triggering measurement or billing) and an explicit prerequisite ordering: 'Call get_video_analysis_bundle first.' It does not state when to avoid this tool or what happens if the prerequisite is skipped, so it stops just short of full routing guidance.

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