ghl_countdown_update_timer

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

Annotations already declare non-read-only, non-destructive, non-idempotent, open-world behavior, so the bar is lower. The description adds genuinely useful context — location scoping from the access token and the required write scope — but says nothing about whether omitted body fields are preserved or cleared on a PATCH, or what a failure looks like.

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?

Front-loads the operation and constraints in a small, scannable block with no filler prose. The raw endpoint/source-file line is boilerplate of marginal value but costs only one line.

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 mutation with a deep, 15+ field nested body and no output schema, the most important missing piece is partial-vs-full update semantics and any validation constraints on timerType/date combinations. Auth and endpoint context are present, but that gap leaves an agent guessing about safe invocation.

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% and the nested body DTO is documented field by field, so the schema carries the load. The description adds no parameter guidance of its own beyond the path placeholder — notably no explanation of how the large designMeta/timer type fields interact with an update.

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 ("Update an existing countdown timer") and backs it with the exact endpoint PATCH /countdown-timer/timers/{timerId}. The verb distinguishes it from the sibling create/delete/get/list countdown tools without naming them, which is enough for an agent to route correctly.

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?

Conveys real prerequisites — a Sub-Account (location) token and the countdown-timer/timer.write scope — and that timers belong to the token's location. However, it never states when to choose this over ghl_countdown_create_timer or how to obtain a timerId (e.g., via ghl_countdown_list_timers), so the selection logic is only implied.

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