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

With readOnlyHint=true, the bar is lower, and the description adds genuine behavioral context: it returns references (not the text itself) organized by category, which is beyond the annotation. This prevents an agent from expecting full text output. No contradiction 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?

A single efficient sentence packs the purpose, examples, return type, and follow-up action with zero waste. The core purpose is front-loaded before the category details.

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 simple list tool with readOnlyHint=true, the description covers what is returned (refs by category), gives category examples, and routes to sefaria_text for the actual content. With no output schema, the return format is described adequately, though slightly more explicit formatting detail could be added.

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% so both parameters are already documented. The description adds marginal value by listing example categories (Rashi, Tosafot, etc.) that map to the category filter, but doesn't add syntax or format details beyond what the schema provides. Baseline 3 is appropriate.

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 states a specific action (retrieving commentaries and texts linked to a reference) with concrete examples (Rashi, Tosafot, midrashim, halakha, responsa) and clearly differentiates from the sibling sefaria_text by noting the caller must load text separately. An agent can distinguish this from sefaria_text and sefaria_search without opening schemas.

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 provides a clear usage workflow: call this to fetch linked references by category, then load the actual text with sefaria_text. This names the follow-up tool and the sequencing. However, it doesn't explicitly state when NOT to use it or name alternatives like sefaria_search for finding refs, so exclusions are absent.

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