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

'Returns how to do it step by step (screens, buttons, fields) and opens nothing by itself' is valuable behavioral context that clarifies the output type and the side-effect-free nature, consistent with readOnlyHint=true. The annotations already carry the safety profile and idempotence, so the description's added value is moderate rather than essential; it does not describe the response format or any limits on the guidance.

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?

Three sentences with the key caveat (returns instructions, opens nothing) placed early and the follow-up workflow right after. The 'from ChatGPT, Claude or any AI agent' clause is filler, and the API note could be tighter, but there is little wasted prose.

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 zero-parameter, read-only guide tool with no output schema, the description covers what it returns, that it performs no action, and which tools to use afterward. It could be stronger by sketching the response shape or noting the API restriction's implications, but it is sufficient to call the tool correctly.

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?

The tool takes zero parameters, so there is no parameter meaning to add and the baseline of 4 applies. Nothing in the description contradicts or misrepresents the empty 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 resource (intake form in Jane App), but the leading claim 'Email an intake form in the user's own Jane App account' implies the tool performs the emailing, when it actually only returns step-by-step instructions. The true behavior is disclosed in the second sentence, so the agent can recover, but the initial framing is misleading relative to the title/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?

It gives a clear next step ('then do it with the cotlet_browser_* tools in the user's Jane App Cloud Browser') and notes the official API is unavailable to non-partners, which usefully steers the agent toward browser automation. It does not explicitly compare itself to the many jane_app_* siblings or state when not to use it, so the guidance is implied rather than complete.

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