get_world_brief

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

Annotations provide readOnlyHint=true. The description adds valuable behavioral context: it is AI-synthesized, OSINT/GEOINT digest, free of token charges, and covers the previous UTC day. This goes beyond the annotation, though rate limits or data freshness details are absent.

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?

The description is a single, well-structured sentence that front-loads the core purpose and includes all key details without redundancy. Every word adds value.

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?

Despite no output schema, the description thoroughly explains the brief's contents (headline, summary, developments, per-theme roll-up, ranked signals), making the return format clear. For a simple data-fetch tool with one parameter, this is complete.

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% for the single 'date' parameter. The description adds that it defaults to the latest available, which is useful but not essential. Baseline 3 is appropriate since the schema already fully documents the parameter.

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 clearly states the tool fetches a 'Daily World Brief' with detailed content specifications (headline, executive summary, top developments, etc.). The verb 'Fetch' and the resource 'World Brief' are specific, and the tool is distinct from siblings like ask_analyst or query_signals.

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 mentions 'Free of token charges' and defaults to latest brief, implying cost-free retrieval, but provides no explicit guidance on when to use this tool versus alternatives (e.g., query_signals). No when-not-to-use or exclusion criteria are given.

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