Create Sequence Checkpoint

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

Annotations (readOnlyHint=false, destructiveHint=false) already signal the safe mutation profile, but the description adds valuable behavior: it verifies the clone's track/clip counts, re-activates the original, and promises it 'never deletes or overwrites anything.' This goes beyond the annotations by detailing the verification and re-activation steps, which an agent would need to trust the safety and side effects.

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 sentences, zero filler. The first sentence front-loads the core action and return value, and the second packs verification, re-activation, and safety guarantees. Every clause earns its place; no redundancy or fluff.

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 three-param tool with an output schema and strong annotations, this is nearly complete. It covers the purpose, safety, verification, and the snapshot relation to diff_sequence_snapshots. It doesn't explicitly mention prerequisites (e.g., valid sequence_id) but the schema covers defaults and the active sequence fallback. Minor gaps like error behavior are not critical here.

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 coverage is 100%, with each parameter (label, sequence_id, include_snapshot) having a clear description including defaults. The tool description does not add much beyond the schema—it hints at label usage via 'named [checkpoint]' but doesn't explain parameter interactions or behavior in depth. Baseline 3 is appropriate since the schema carries the parameter meaning.

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?

The description opens with a specific verb and resource: 'Clone a sequence into a named checkpoint copy before a risky edit.' It clearly distinguishes this from siblings like list_sequence_checkpoints (listing) and diff_sequence_snapshots (comparing), and ties the return value to that delta tool. The purpose is unambiguous.

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?

It explicitly scopes usage to 'before a risky edit' and frames the return as a 'diff_sequence_snapshots-compatible snapshot,' indicating when to use it (pre-edit) and the downstream workflow. It does not explicitly name alternatives, but the context (create vs. list/diff) is clear from the sibling tool names, so it provides practical guidance without being exhaustive.

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