Rules

FP404 · undefined-matrix-key

An expression reads a matrix key that no combination defines (or the job has no matrix).

Code	Name	Category	Default severity
`FP404`	`undefined-matrix-key`	Matrix	🔴 error

Why it matters

The value is always empty — almost certainly a typo or a key that was renamed in the matrix.

Fix the key name, or add it to the matrix.

Change the severity (or turn the rule off) in .github/flowpact/flowpact.config.yml, by code or by name:

.github/flowpact/flowpact.config.yml

rules:
  FP404: off
  # or: undefined-matrix-key: error

Explain it in the terminal:

flowpact explain FP404

FP403 · dynamic-matrix-unverified

The matrix is computed at runtime, so flowpact cannot check that every combination defines the keys it reads.

FP405 · unused-matrix-shape

A `matrixShapes` entry in the config does not match a job with a runtime-computed matrix.