Pagebolt

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

With no annotations provided, the description carries full burden and does well: discloses plan requirements (Starter+), session expiration (10 minutes inactivity, 30 minute hard cap), and that sessions keep browser pages open for reuse. It doesn't mention error conditions or performance characteristics, but covers key behavioral aspects.

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?

Well-structured with zero waste: first sentence states core purpose, second explains utility and connection to sibling tools, third covers expiration policy, fourth provides usage context. Every sentence earns its place.

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 creation tool with no annotations and no output schema, the description does well: explains purpose, usage context, behavioral constraints, and connection to other tools. It doesn't describe the return value format (though mentions session_id) or error conditions, but covers most essential context.

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 schema already documents all parameters. The description doesn't add any parameter-specific information beyond what's in the schema. Baseline 3 is appropriate when schema does the heavy lifting.

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 creates a persistent browser session for reusing cookies, localStorage, and auth state across multiple screenshot or sequence calls. It specifically distinguishes from siblings like take_screenshot and run_sequence by explaining this is a prerequisite session creation 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?

Explicitly states when to use: 'Starter+ plan required', 'useful for AI agent workflows that log in once and then take multiple screenshots of authenticated pages.' It also distinguishes from siblings by explaining the returned session_id should be passed to take_screenshot or run_sequence tools.

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