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How to unblock a pipeline stage stalled by a stale marker with Forward Implementation First

Run a blocked stage by hand, validate it, publish it, and continue from the cursor.

Who it is forA data or pipeline engineer whose staged run stopped because a hash or receipt no longer matches after one producer changed.

The problemThe agent invalidates many completed stages over metadata drift and refuses to run the blocked stage manually, so no output ships.

The outcomeThe blocked stage runs, its output is validated and published, the cursor moves forward, and only the smallest affected cone is replayed.

What you need first

  • git installed, to clone the repository
  • A shell that can run ./install.sh
  • Claude Code, Codex, or another agent that loads skills from a skills directory
  • A staged pipeline or repository where the agent works over several steps

Steps

  1. git clone https://github.com/Vuk97/forward-implementation-first
  2. cd forward-implementation-first
  3. ./install.sh
  4. Restart the agent so it loads the skill, since running sessions do not reload skills.
  5. Ask the agent to classify the blocked action as semantic implementation, focused validation, or administrative bookkeeping, and to run the stage manually if only a marker blocks it.

Prompt for your agent

Using the forward-implementation-first skill in <pipeline-repo>, run the stage blocked only by a stale receipt for <stage-name> manually, validate its output against its consumer, and publish it. Report the stage output path and the cursor position after the run. Verify that no stages outside the smallest affected dependency cone were invalidated.

Caveat. The README describes the behavior as a suggestion the model decides to load, so an always-on rule or hook may be needed for the decision to hold every time.

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