ghl_countdown_create_timer

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

Annotations already declare readOnlyHint=false, destructiveHint=false, idempotentHint=false and openWorldHint=true. The description adds genuinely non-structured context: the operation is bound to the access token's location, requires a sub-account token, and needs a specific OAuth scope — all things an agent must know before calling. No contradiction with annotations.

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 scoping constraint is front-loaded, which is right. But three lines restate the same action ('Create Countdown Timer' / 'Create a countdown timer for the access token's location'), and the endpoint/spec-source metadata is low-value for an agent choosing a tool — some trimming is warranted.

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 create mutation with a deeply nested required body and no output schema, the description covers auth model, scope, and endpoint, and the schema covers all body semantics including cross-field conditionals. Only the return payload/error behavior is unaddressed, which is a minor gap given annotations already flag the write.

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%, including every nested design field, examples and conditional notes (endDate required for fixed, timerDuration required for dynamic/recurring, dynamicTimerParams required for dynamic). The description contributes nothing about parameters, so the baseline 3 applies — the schema does all the work.

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?

Specific verb + resource: 'Create a countdown timer for the access token's location'. The location scoping constraint is stated explicitly, which is the key disambiguator. It doesn't explicitly name sibling tools (list/get/update/delete timer, list_timer_templates), but the create-vs-read verb separation is unmistakable.

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?

Prerequisites are clear (Sub-Account location token, OAuth scope countdown-timer/timer.write), which implies when the call can succeed. However, there is no explicit guidance on when to create vs. reuse/update an existing timer, nor a pointer to ghl_countdown_list_timer_templates despite templateId being required — that pointer exists only in the nested schema.

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