Playbook for combining multiple signals into a μ / confidence / relation estimate in prototypes/mu_cosine. Use when the work involves fusing multiple μ sources, "confidence weighting", calibration, product-of-experts / precision / inverse-variance combining, selective prediction, or picking a confidence gate — so you start from the calibrated joint-posterior + margin-gate approach instead of hand-set independent weights. Trigger on: "confidence", "uncertainty", "combine sources", "fuse judges", "which source to trust", "calibrate", "AURC/ECE".
Use when the apply_patch tool is blocked by approval/path-resolution errors even though the target file is inside the trusted workspace. Try the normal apply_patch tool first; if it requires approval or rejects writable workspace paths, use a deterministic repo-local edit script and immediately verify the diff.