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

With no annotations, the description carries the full burden and does disclose the execution environment (headless Chromium) and the exact artifacts returned (title, headings, localStorage keys, interactive selectors). It is silent on non-mutation guarantees, timeouts, and failure behavior, but the read-only nature is implied by "inspect."

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?

Two sentences, zero filler. The action and returned artifacts come first and the usage directive last, which is the right front-loading for a discovery tool.

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?

There is no output schema, so the description must describe the return value itself, and it enumerates the fields an agent needs in order to build selectors for a subsequent recording. Nothing material is missing for a read-only inspection tool.

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 all three parameters including defaults and bounds are already documented in the schema. The description adds only the localhost-port hint for url, which is essentially redundant with the schema example. Baseline 3 applies.

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?

States a specific verb and resource: opens a target web service URL in headless Chromium and returns a defined set of artifacts. It also enumerates the returned contents, which clearly distinguishes it from the write-oriented sibling record-poc.

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?

"Use this before recording to discover accurate selectors" gives an explicit ordering constraint that routes the agent to inspect before record-poc. It does not name the sibling directly or state exclusion conditions, so it stops short of a full 5.

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