Fetch one islamweb library page

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

With no annotations provided, the description must bear the full burden of behavioral disclosure. It states that the tool fetches and parses content, and lists the return fields, which conveys the core action. However, it does not explicitly confirm that the operation is read-only, describe error handling, mention rate limits, or note any authentication requirements. This is adequate for a simple fetch but lacks explicit safety and side-effect disclosures.

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 with no redundant words. It front-loads the purpose ('Fetches a single content page'), includes the URL for clarity, and lists the output fields. Every element contributes to the agent's understanding, making it concise and efficient.

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 two-parameter fetch tool with no output schema, the description provides sufficient context: it identifies the resource, the input parameters' role, and the structure of the output (fields). It does not specify data types for the returned fields or cover error scenarios, but these are minor gaps for a straightforward retrieval operation. The description is complete enough for correct tool 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%, so the input schema already documents both parameters (bookId and id) with examples. The description merely repeats the URL pattern that references these parameters, adding no new semantic meaning. This meets the baseline of 3 but does not enhance understanding beyond the schema.

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 verb ('Fetches') and a clear resource ('a single content page from islamweb.net's library') with a concrete URL template. It also enumerates the exact JSON fields returned, distinguishing it from siblings like islamweb_start_crawl (which initiates crawls) and islamweb_search (which searches). This makes the tool's purpose unmistakable.

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 offers no explicit guidance on when to use this tool versus any alternative. It does not mention that it should be used for retrieving a specific page by ID, nor does it contrast with sibling tools or state prerequisites. Usage context is only implied by the tool name and description, leaving an agent to infer applicability.

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