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

Annotations only declare readOnlyHint=false, destructiveHint=false, openWorldHint=true. The description adds the real behavioral weight: it spends workspace credit, delivers for real to the email/channel, sits behind an approval gate that may return needs_confirmation, and is fire-and-forget with pointers to check lastStatus or the trace. This is exactly the mutation/credit context beyond the 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?

Front-loads the core action, then layers the operational constraints (credit, real delivery, approval) and the follow-up path in tight sentences. No filler; every clause carries actionable information.

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 mutating, credit-spending tool with no output schema, the description covers the important gaps: async fire-and-forget semantics and where to read status (schedules_list) or trace (executions_get). An agent has everything needed to call it correctly and handle the confirmation flow.

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%, so the schema already documents all four parameters, including workspace and approvalId. The description only indirectly relates to approvalId via its needs_confirmation note and adds no format or usage detail beyond the schema, so the baseline of 3 applies.

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 precise verb and resource: 'Runs one iteration of a schedule immediately through the real scheduled pipeline.' It explicitly contrasts with the cadence-altering sibling behavior ('without moving its cadence'), so an agent can distinguish it from workbench_flows_schedules_update or workbench_flows_run without opening schemas.

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 a concrete when-to-use ('Use it to test a schedule the user just set up') and a scope note ('Works on paused schedules'), plus the approval-gate prerequisite. It does not explicitly name the alternative delete/update siblings or state when NOT to use it, so it stops short of 5.

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