Module 11 Activity

Scenario

The capstone. An approval-aware research workflow, with the evidence that it behaves as designed.

What you build

A complete graph with conditional and error paths, a human gate before the irreversible step, checkpointing verified across processes, and an evidence record.

Steps

1. Write the design as data - state with reducers, nodes, terminals, gate position, irreversible steps - and run the four structural checks.
2. Implement the routing as one function with ordered early returns. State what each ordering decision means.
3. Add the human gate before the irreversible node, and have that node check both approval and its own guard flag.
4. Test the duplicate resume explicitly and confirm one effect.
5. Verify a resume from a genuinely separate process, and confirm the expensive node ran once.
6. Produce the evidence record: path taken, human intervention, proof the irreversible step ran once, branch coverage, and known limits.

Evidence to hand in

• The design as data with the four check results.
• The single routing function, with precedence explained.
• Evidence that a duplicate resume produced one effect.
• Evidence of a cross-process resume with the expensive-node count.
• The complete evidence record including known_limits.

Review checklist

• All four structural checks pass before implementation.
• Routing precedence is readable in one function.
• The irreversible node checks both approval and its guard flag.
• The cross-process resume is genuine, not a second call in one script.
• Branch coverage includes the error path.
• known_limits is populated and specific.

Mark complete