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

Annotations already declare readOnlyHint=false, idempotentHint=true, destructiveHint=false and openWorldHint=true, so the mutation/idempotency profile is known. The description adds one genuinely useful behavioral fact — that finished broadcasts produce playbooks visible to other agents — but omits whether ending is terminal, whether the record can be resumed, and what the call returns.

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?

Two tight sentences with the required action front-loaded and no filler. The second sentence is motivational context about playbook distillation rather than an instruction, so it is slightly less load-bearing than the first.

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 5-parameter mutation tool with a nested playbook object, an undocumented required `key`, and no output schema, the description leaves too much unaddressed — it never explains the required identifying parameters, the meaning of the three status values, or whether ending the broadcast is permanent.

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?

At 40% schema coverage, the description needs to compensate and does not: the two required parameters (id, key) are completely undescribed here and in the schema, and 'key' is especially opaque. It only loosely gestures at `answer` ('the outcome') and `playbook` ('a short summary of what worked'), and says nothing about the status enum with its done/error/stopped outcomes.

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 clear action (finish the broadcast) plus what must be supplied (outcome and short summary of what worked), which is more than the title restates. However, it never distinguishes ending a broadcast from siblings like delete_broadcast or review_broadcast, so an agent must infer the boundary from the name alone.

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?

There is no explicit when-to-use guidance: nothing says this is the terminal call for every broadcast, nor when to prefer it over delete_broadcast or how it relates to broadcast_step/go_live. The only contextual hint is that successful public broadcasts feed playbooks, which is a motivation rather than a usage rule.

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