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

Annotations already declare idempotentHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds useful context: the sequence is intent-level and does not create provider payloads, clarifying that nothing external is provisioned. However, it says nothing about what 'steps' contain, whether validation occurs, or how idempotencyKey is used.

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 short, front-loaded sentences with no filler. Its brevity is appropriate in form, though the low information density is a completeness problem rather than a conciseness one.

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?

An output schema exists, so return values need not be explained. But for a creation tool with 11 undocumented, zero-required parameters and a nested 'steps' array, the description omits critical information an agent needs to call it correctly – especially the step structure and the role of campaign/external identifiers.

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 0% across 11 parameters, so the description must compensate and does not. It names stop-on-reply/bounce/unsubscribe and vaguely references steps and delays, but leaves name, campaignId, idempotencyKey, external* IDs, and the step object shape entirely undocumented.

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 ('Creates an intent-level email sequence') and lists the sequence concepts it covers (steps, delays, stop conditions). It distinguishes itself from provider-payload-based creation, but does not explicitly differentiate from the sibling create_campaign or preview_sequence.

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?

No statement of when to use this tool versus create_campaign, preview_sequence, or launch_campaign. The only qualifier is 'intent-level ... no provider payloads', which hints at a use case but gives no explicit selection criteria or prerequisites.

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