chrome_page_load_resource_pipeline

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

Annotations already show readOnlyHint=true and idempotentHint=true, so the description adds value by detailing output fields (matched_by, matched_url_seed) and an evidence_boundary caution. This provides behavioral context beyond the annotations, though it could mention that it does not mutate state.

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 paragraph but packs essential information with front-loaded purpose and usage guidance. It could be slightly more structured (e.g., bullet points for parameters), but each sentence contributes meaningfully, and it avoids fluff.

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?

Given 10 parameters, no output schema, and high schema coverage, the description sufficiently covers workflow (use after summary), parameter interplay, output specifics (timing facts, matched_by), and a caution. It is comprehensive for the tool's complexity.

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?

With 100% schema description coverage, the baseline is 3. The description adds extra context by summarizing key parameters (url_substring or example_slice_id required, defaults for limit) and their roles, which aids understanding beyond the schema alone.

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: drill into a Chrome page-load resource URL and join its lifecycle/request spans with script parse/evaluate and style/layout signals. It identifies the specific resource (URL) and the domain (Chrome page-load resources), and distinguishes from siblings by referencing the prior summary 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?

Explicit guidance is given: 'Use after chrome_page_load_resource_summary by passing example_slice_id or url_substring for a slow URL.' This indicates the prerequisite and parameter choice. However, it does not exhaustively cover when not to use or alternatives, but provides clear context for correct usage.

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