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

The description adds one useful behavioral disclosure: 'Moving does not move clips or change branding.' However, it does not disclose the meaning of null seriesId/expectedSeriesId, concurrency-failure behavior, or side effects of assignment/detachment beyond the moving case.

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 short sentences front-load the action and resource, and the follow-up sentence delivers a key side-effect warning without burying the main purpose.

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?

Given no annotations and no parameter descriptions in the schema, the description must carry most of the semantic load. It omits concurrency semantics, detach behavior with null IDs, idempotency behavior, and any mention of workspaceId.

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?

Only expectedSeriesId is mentioned, and its role as an optimistic-concurrency guard is not explained. The schema has zero descriptions, so the meaning of contentId, workspaceId, seriesId null, and idempotencyKey is left entirely to inference.

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 opens with the exact verb set: 'Assign, move or detach one source or project,' which clearly identifies the action and resource. It also names the key parameter (expectedSeriesId) and adds a scoping detail (one source/project), so the tool's purpose is unambiguous.

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?

The description explains what the tool does but gives no guidance on when to choose it over alternatives, and no preconditions or exclusions. With sibling tools such as series_apply present, an agent gets no help deciding between them.

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