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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so safety is covered structurally. The description adds value annotations don't: it describes the payload as a full record including its description, kind and parent project — the only return-shape information available, since there is no output schema. Not-found/error behavior is unmentioned, keeping it below 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?

Two sentences, zero filler, with the scope ('one ... in full') front-loaded before the discovery guidance. Every clause earns its place by either defining the resource or routing to the right sibling.

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 one-parameter, read-only lookup with full schema coverage and rich annotations, the description supplies what structured data does not: the returned facets and the prerequisite discovery step. Only the failure mode for an unknown id is left implicit, a minor gap given the simplicity of the 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?

Schema description coverage is 100% and the single parameter 'id' is already documented in the schema as the record number from search or list results. The description reinforces that the id must come from a prior listing step but adds no format or constraint detail beyond the schema. 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 ('Fetch one content series in full') and immediately scopes it to a single record, distinguishing it from the list sibling by the word 'one'. It also enumerates the returned facets (description, kind, parent project), so an agent knows exactly what this call yields versus list-content-series.

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?

Explicitly routes the agent to 'list-content-series or search' to obtain the identifier before calling, which is the main prerequisite for a get-by-id tool. It gives clear context but stops short of stating exclusions (e.g., don't use this when you need many items at once), leaving that to inference.

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