deslop skill

---
name: deslop
description: Audit or apply evidence-backed, test-first subtractive cleanup for accumulated agent-created test bloat, verification theater, and defensive or fallback bloat while preserving independent external behavior. Invoke explicitly for semantic simplification, not generic refactoring.
---

# Deslop

Deslop removes complexity accumulated during repeated coding-agent implementation and correction cycles. It is a semantic cleanup policy, not a beautifier, dead-code sweeper, generic refactoring tool, or redesign assistant.

## Priority order

Work in this order. Do not let an easy dead-code deletion displace a higher-priority cluster.

1. **Test-suite bloat.** Treat tests as production code that can accumulate after every agent correction. Remove duplicate, self-referential, implementation-detail, and obsolete tests while retaining a minimum sufficient set of independent behavioral evidence.
2. **Verification theater.** Investigate checksums, receipts, manifests, validators, recomputation, and result envelopes whose producer and verifier share the same information and failure domain.
3. **Defensive and fallback bloat.** Investigate broad catches, catch-and-fallback paths, speculative compatibility branches, repeated validation, and recovery machinery that masks errors without a current contract.

Generic dead code, wrappers, abstractions, comments, and ordinary duplication are secondary. Touch them only when they belong to one of the three target clusters or have direct high-confidence evidence.

**Reduce test surface, not behavior surface.** Evidence that a test is redundant or accumulated test-suite bloat justifies deleting or consolidating that test; it is not independent evidence for changing the production behavior the test exercises. When test-suite bloat is the active target, keep distinct externally observable production semantics—including public success, rejection, error, edge-case, and supported compatibility behavior—outside the deletion target unless the production construct is separately justified for removal by another target cluster, or direct evidence from current requirements, real callers, specifications, or history establishes that the behavior is obsolete or incorrect. Do not reclassify tested behavior as defensive or validation bloat merely because deleting its test leaves nothing else requiring it; the test may be its clearest executable specification.

Adding tests is not the default response to cleanup. When production slop is deleted, tests whose only purpose is to protect that slop should normally be deleted in the same change.

## Test-first evidence pass

When tests are in scope, complete this pass before changing production behavior:

1. Inventory collected test nodes plus their fixtures, fakes, helper stacks, generated inputs, output targets, skips, and deselection rules.
2. Map each test to `current owner -> production branch -> observable result -> independent oracle -> failure domain`.
3. Group tests by failure domain. Consolidate inputs that reach the same branch and result; preserve separate rejection, safety, persistence, protocol, resource, and numerical semantics.
4. Choose the strongest surviving evidence root for each group: a public seam where possible, an independently specified low-level invariant where necessary, and one hermetic cross-layer root for each current delivery path.
5. Remove fixtures and test-only support with the tests they serve. Remove production code in that cluster only when separate caller, contract, history, and reachability evidence also justify it.
6. Re-collect and run the remaining suite. Record skips and deselections, and compare worktree state before and after tests that may generate files.

Do not use coverage, test count, or a test-created configuration as an owner. The output of this pass is a smaller evidence set with the same real failure domains, not a target number of tests.

### Test decision contrast

- **HIGH cleanup:** several tests reach the same public success branch; one asserts the exact externally visible result while the others only repeat construction, type, or non-empty checks. Keep the strongest behavioral root and remove the dominated tests plus support used only by them.
- **PRESERVE:** one test covers successful output and another covers externally visible rejection, safety, persistence, or supported compatibility behavior. They protect different results or failure domains; do not merge or delete one merely to reduce the count.

## Closed justification loops

Production code does not justify a test merely because the test exercises it. A test does not justify production code merely because the production code exists. Follow justification chains outward until they reach an independent evidence root.