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

Annotations already declare readOnlyHint=true and destructiveHint=false, and the description is consistent with that ('opens nothing by itself'). Beyond the annotations it adds genuinely useful behavior: the return value is step-by-step UI instructions rather than a mutation, and execution requires the cotlet_browser_* tools. It does not describe error cases or what happens if the timer does not exist.

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 core sentence about returning steps and using cotlet_browser_* is front-loaded and earns its place. However, 'from ChatGPT, Claude or any AI agent' and the closing sentence about StreamElements' kappa v2 REST API and 'checked 17 Oct 2026' are justification/marketing content that does not help an agent decide or invoke. Trimming those would sharpen it considerably.

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 explain what comes back, and it does: step-by-step screens, buttons and fields. Combined with the routing to cotlet_browser_* tools, an agent has enough to act. It could be more complete by noting that the guide must be re-fetched per timer or that the browser session must be authenticated.

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 semantics to document and the baseline of 4 applies. The description correctly implies no inputs are needed, since it only returns static guidance.

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?

Names a specific resource (timer) and platform (StreamElements), and crucially clarifies that the tool does not perform the edit itself but 'Returns how to do it in StreamElements step by step (screens, buttons, fields)'. That resolves the mismatch between the imperative name 'edit_timer' and what the tool actually returns. It stops short of distinguishing itself from the sibling cotlet_app_guide, which likely serves a similar instructional role.

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?

Gives an explicit two-step workflow: call this first to get screens/buttons/fields, 'then do it with the cotlet_browser_* tools'. That is actionable routing to the right follow-up tools. It lacks any when-not-to-use guidance or prerequisites (e.g. whether the user must already be logged into StreamElements in the Cloud Browser).

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