Hashline

hashline

**Hash-anchored file editing for Claude Code, AI coding agents, and patch-safe automation.** Every line gets a stable xxh32 hash (`42:a3`). Patch by anchor, not by fragile text match. Stale reads are caught and rejected before they corrupt your work.

curl -fsSL "https://raw.githubusercontent.com/quangdang46/hashline/main/install.sh?$(date +%s)" | bash

🤖 Agent Quickstart (MCP / Robot Mode)

hashline ships a 6-tool MCP server that works with Claude Code, Codex, Cursor, Windsurf, Gemini CLI, and OpenCode. The installer auto-configures it.

# MCP stdio server (auto-wired by installer)
hashline mcp

# Read a file with hashes — agents copy anchors, not lines
hashline read src/auth.js

# Patch by anchor — survives nearby edits (compact output)
hashline patch src/auth.js 'SWAP 2:b2:
+  const decoded = jwt.verify(token, env.SECRET)'
# OK src/auth.js#7f2a edits=1 changed=1
# ~2:f9|  const decoded = jwt.verify(token, env.SECRET)

# Dry-run before applying
hashline patch src/auth.js 'DEL 3' --dry-run

**Output architecture** — agent-first, token-minimal by default:

**Output conventions**

• stdout = data only