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comet-build

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Plan, implement, and accept Classic tasks. Use when the user invokes /comet-build or Classic Runtime enters Build or returns to Build for repairs.

assets/skills/comet-build/SKILL.md

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Nov 9, 2026
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# Comet Phase 3: Plan and Build

On first entering a phase, handing off to a new Agent, or restoring context, read and follow [Task Context and Artifact Language](../comet-classic/reference/scripts.md#task-context-and-artifact-language). Prefer the current continuation or claimed Action's `contextRequest`; do not retrieve repeatedly during uninterrupted work in the same phase.

After entry returns layout, follow `comet-classic/reference/classic-layout.md` to bind each logical root to its directory. Do not reload the protocol if it is already in context. Use the adapter for all OpenSpec CLI calls and the bound `<classic-*>` roots for paths; do not run an extra root show first.

## SDK Run path

On first entering the current SDK phase, handing off to a new Agent, or restoring context, read [phase entry and recovery](../comet-classic/reference/sdk-methods.md#phase-entry-and-recovery) and the current phase's section in that reference. Reuse them when already available and still valid in this session. Continue with the phase below; recovery routes based on `nextAction.kind` apply only to older responses without a continuation mode.

Reuse the current valid result's `agent.continuation` / `data.nextAction` and bound state. Run `comet state next <change-name> --json` only on a cold resume, after external state changes, or when necessary information is missing. For `data.runtimeFormat: sdk`, advance only this Run; the implementation methods, plan content, and reviews are in SDK execution methods; submit state and evidence through this section. `data.phase` must be `build`. Reuse valid layout and configuration already in context; use `comet state check <change-name> build --json` only when they are missing. For `nextAction.kind: reconcile`, run `comet state check <change-name> build --recover --json` and establish the original outcome before repeating external work.

First check `workflow` in the valid configuration or the current `nextAction.stepId`. For `tweak.build.*` / `workflow: tweak`, **Immediately execute:** Use the Skill tool to load the comet-tweak skill. Skipping this step is prohibited. For `hotfix.build.*` / `workflow: hotfix`, **Immediately execute:** Use the Skill tool to load the comet-hotfix skill. Skipping this step is prohibited. After the skill loads, pass the same change, workspace, phase, Run revision, and continuation and resume its SDK Build step. Do not require a full Design Doc or implementation plan, or repeat Open. Older Runs may still store `comet-build` as the raw Action reference; route them the same way. After an approved upgrade, use the full path in SDK execution methods when the current step is `full.build.*`.
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