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

With readOnlyHint=true already provided, the description adds substantial behavioral context: it discloses that the skill uses verified primary texts via Sefaria, provides links to hebrewbooks.org for reading, and covers specific Jewish text domains. This goes beyond the annotation by explaining the tool's method and output behavior.

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 two sentences, with the first providing a dense but informative overview of the skill's purpose and the second a clear usage instruction. It is not overly verbose, though the enumeration of text genres makes the first sentence slightly long.

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 tool with no parameters, no output schema, and simple annotations, the description is complete: it explains what the skill does, when to use it, the topics covered, and the sources involved. The agent has enough information to know when to load this skill and what to expect.

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 reflects this, so there is no parameter information needed. The description does not need to explain parameters, and the baseline for zero parameters is 4.

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's purpose: 'Charge le skill d'étude des sources juives' (loads the Jewish sources study skill) and specifies the domain of religious questions (halakha, Talmud, Tanakh, responsa, hassidout, moussar). It distinguishes itself from sibling Sefaria tools by being a meta-skill loader, not a direct search or text retrieval tool.

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 explicitly says 'À charger AVANT de répondre à toute question religieuse' (to load before answering any religious question), providing a clear when-to-use trigger. However, it does not explicitly mention when-not-to-use or alternative tools, though it implies this skill should precede the use of Sefaria tools.

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