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. The description adds genuinely new behavioral facts: results are short summaries rather than full records, and the result set is bounded by what the signed-in user can reach. Pagination behavior is left to the schema.

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?

Four short sentences, front-loaded with the action and scope, then the concept definition, then the result shape, then filter options. No wasted clauses and nothing buried at the end.

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?

With no output schema, the description compensates by stating the return shape (short summaries) and pointing to the detail tool. Five fully documented, all-optional parameters plus read-only annotations mean nothing an agent needs to call it correctly is missing.

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 coverage is 100% and each parameter is described (page, search, project, per_page, project_id), so the baseline is 3. The description only restates the project-narrowing and title-search modes in prose without adding format or interaction semantics beyond the 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?

States a specific verb and resource ("List the content series") plus the access scope ("the signed-in user can reach"), and defines the domain concept ("A series groups related videos — a season, a recurring format, a themed run"). It also names the sibling get-content-series, so the agent can distinguish a list call from a detail call without opening either schema.

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 clear routing guidance: use this for short summaries, call get-content-series for one in full. Also notes the two narrowing modes (project, title search). It stops short of any explicit when-not condition or prerequisite, so it is a strong 4 rather than a 5.

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