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

With no annotations provided, the description carries the full burden of behavioral disclosure. It does reveal one meaningful trait — the asynchronous model where crawls continue after the initiating call returns — but it omits what the tool returns, whether it is a read-only status poll, whether it blocks or errors on unfinished jobs, and any polling semantics. This is a thin disclosure for a tool with zero annotation coverage.

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 sentence of eight words with the main verb and object front-loaded; every word earns its place. The only knock is that 'outlived its call' is a clever, slightly indirect phrasing that trades directness for style.

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?

An output schema exists, so return-value documentation is covered externally. For a single-parameter tool the definition is nearly adequate, but the provenance of job_id is left to inference, the status semantics are unexplained, and there is no annotation safety profile. It is minimally sufficient but with clear gaps.

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 0%, so the description must compensate for the bare job_id schema, and it adds only marginal meaning: it implies job_id identifies the asynchronous crawl from a prior call. It does not say where to obtain job_id (presumably from crawl_site's response) or describe any format expectations, so the compensation is insufficient for 0% coverage.

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 uses a specific verb ('Fetch') and resource ('a crawl'), and the phrase 'outlived its call' clarifies this targets a crawl job still running after the initiating call returned. This distinguishes it from the sibling tools (crawl_site initiates, extract_page/detect_site do other work). However, it never explicitly says it returns status/progress/results, leaving that to be inferred from the tool name.

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?

Usage context is implied rather than stated: 'a crawl that outlived its call' suggests the agent should use this after initiating a crawl and wanting to check on it later. No explicit when-to-use guidance, no named alternatives, and no exclusions are provided, so the agent must infer the relationship to crawl_site.

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