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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so the safety profile is covered. The description adds value beyond that by disclosing result ordering (newest first) and the key field returned (briefId), which is exactly the behavioral context an agent needs for planning. It does not mention truncation or what happens when no briefs exist.

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 that front-loads the action and scope, then the routing hint. Nothing is redundant with the schema or annotations, and every clause carries information.

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 does name the critical return field (briefId) and the sort order, which is enough to call and use the tool. Minor gaps remain around empty-result behavior and what other brief fields come back, but nothing blocks correct invocation.

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%, with both 'project' and 'limit' documented including defaults and the max of 50. The description only restates that results are scoped 'for a project' and adds no syntax or format detail beyond the schema, so the 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 ('Lists the content briefs'), the scoping domain ('saved in the Hi, Moose Library for a project'), and the ordering ('newest first'). It also names the downstream consumer ('the briefId create_draft needs'), which separates it cleanly from siblings like create_content_brief and list_drafts.

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 an explicit trigger: 'Use it when the user refers to a brief made earlier,' and implicitly routes agents that need a briefId toward this tool rather than create_draft. It stops short of naming a when-not condition or a competing alternative by name, so it is clear context rather than full routing logic.

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