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

Annotations already declare readOnlyHint=true, so the safety profile is known. The description adds behavioral detail beyond annotations: it states that the tool 'Returns section IDs with their Arabic names', which informs the agent about the output format. It also implies 'all available' sections, indicating no filtering or pagination, which is useful context. No contradictions with annotations.

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 concise in each language, with two short sentences. It front-loads the purpose and immediately explains the return value and relationship to browse_section. The bilingual duplication adds length but is intentional for an Arabic platform; still, it slightly reduces conciseness for English-only agents. Otherwise, every sentence earns its place.

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?

The tool is simple (no parameters) and has an output schema, so the return structure is defined externally. The description fully covers the purpose, the output semantics (section IDs and Arabic names), and the intended downstream usage (browse_section). Nothing an agent needs to call this tool correctly is missing, and the relationship to siblings is clear.

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?

The tool has zero parameters, and the schema already reflects that with an empty properties object (100% schema coverage). Per the rubric, a zero-parameter tool receives a baseline of 4 because there is nothing to explain beyond what the schema provides. The description correctly focuses on the output and usage rather than parameters.

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 action: 'List all available sections and channels on Al Jazeera 360.' It identifies the specific resource (sections and channels) and the platform, and explicitly ties its output to the sibling tool 'browse_section', making its purpose distinct from other listing tools. The bilingual text reinforces the meaning without ambiguity.

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 says the output is 'for use with browse_section', which clearly indicates when to use it (as a prerequisite to browsing a specific section). It does not explicitly state when not to use it or mention alternatives, but the context is strong enough that an agent can infer its role among the siblings. A minor omission is lack of explicit exclusions, hence a 4.

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