sk-hashline-protocol

name	sk-hashline-protocol
description	Enforces hash-anchored line verification to prevent stale-line edits during file mutations. Use when any agent performs file mutations in a worktree — mandates that read lines carry content-identifier hashes and that those hashes are verified before an edit is committed.
disable-model-invocation	true
user-invocable	false

Hashline Protocol — Anchored Edit Verification

The Hashline Protocol ensures atomic mutation safety. Every line read is tagged with a 16-character content-identifier hash; an edit is only committed when the underlying file state matches the recorded hash, eliminating stale-line and whitespace-drift errors. A 16-character string appended to a line representing its exact content state. A mutation operation that references the content-identifier hash rather than a line number.

Protocol Execution

### 1. READ WITH HASHES - Target files are read with line-level hash annotations. - Expected format: `#| ` - Example: `42#a3f9b2c1d8e04f7a| return result`

2. PREPARE THE EDIT

• The target block is identified by its content, not its line number.
• The edit payload includes the explicit <HASH> identifiers alongside the target content.
• Example payload reference: #a3f9b2c1d8e04f7a → replacement content.

3. VERIFICATION (PRE-WRITE)

• The harness recalculates the current hash of each target line before writing.
• If the current hash does not match the recorded hash, the write operation is REJECTED.
• On rejection, the file is re-read to acquire fresh hashes; the hash is never guessed or synthesized.

4. COMMIT

• When all hashes match, the mutation is committed to the isolated worktree for Stage 1 functional review.

- NEVER target a file edit using static line numbers; always anchor to the Content Identifier Hash. - ALWAYS re-read the file upon a hash mismatch; never guess or synthesize the current state. - Edits must be fully localized to the targeted hashes to prevent collateral mutations.

Reference Skills

• sk-worktree-safety — Isolated worktree safety principles.