Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add instructions/submersible/mcp-hashline-edit-server/agents-mdgit clone --depth 1 https://github.com/Submersible/mcp-hashline-edit-serverWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/instructions/submersible/mcp-hashline-edit-server/agents-md)<a href="https://agentmods.dev/instructions/submersible/mcp-hashline-edit-server/agents-md"><img src="https://agentmods.dev/badge/instructions/submersible/mcp-hashline-edit-server/agents-md.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.01872 | $0.01872 |
| Opus 5 | $0.00936 | $0.00936 |
| Sonnet 5 | $0.00374 | $0.00374 |
| Haiku 4.5 | $0.00187 | $0.00187 |
Grade A, and why
mcp-hashline-edit-server AGENTS.md scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 6d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Runs shell commandslowCapability
Expected in a hook, worth knowing in a rule or an instructions file.
| Spawn process | `` $`cmd` ``, `Bun.spawn()` | `child_process` | How it starts
The opening of the file, as written. The whole thing — 176 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Development Guide
Runtime
This project uses Bun exclusively. Do not use Node, npm, npx, or yarn.
# Bun binary location (if not in PATH)
~/.bun/bin/bun
# Install dependencies
bun install
# Run the server
bun run src/index.ts
# Type check
bunx tsc --noEmit
# Add a dependency
bun add <package>
bun add -d <package> # dev dependency
Never use:
npm install,npm run,npx— usebun install,bun run,bunxnode src/index.ts— usebun run src/index.tstscdirectly — usebunx tsc
Project Structure
src/
index.ts — Entry point, stdio transport (thin wrapper around server.ts)
server.ts — MCP server factory with all tool registrations
hashline.ts — Core hashline algorithm (hashing, formatting, parsing, edit application)
types.ts — Edit operation type definitions
fuzzy.ts — Fuzzy text matching (Levenshtein, line-level, character-level)
diff.ts — Diff generation and substr-style replace logic
normalize.ts — Line endings, BOM, Unicode normalization, indentation adjustment
descriptions.ts — Tool description strings shown to the LLM
Origin / Upstream
This project was extracted from the oh-my-pi coding agent (packages/coding-agent/). Source mapping:
| This file | Ported from (oh-my-pi) |
|---|---|
src/hashline.ts |
packages/coding-agent/src/patch/hashline.ts |
src/types.ts |
packages/coding-agent/src/patch/types.ts + schema-derived types from patch/index.ts |
src/fuzzy.ts |
packages/coding-agent/src/patch/fuzzy.ts |
src/diff.ts |
packages/coding-agent/src/patch/diff.ts |
src/normalize.ts |
packages/coding-agent/src/patch/normalize.ts |
src/descriptions.ts |
packages/coding-agent/src/prompts/tools/hashline.md, read.md, write.md, grep.md |
src/server.ts |
packages/coding-agent/src/patch/index.ts (EditTool class, schemas) + src/tools/read.ts, grep.ts, write.ts |
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 6d ago First seen · 176 lines · 1,872 tokens per session scan A e24d2f19458c
mcp-hashline-edit-server AGENTS.md is an instructions file published in the GitHub repository Submersible/mcp-hashline-edit-server (8 stars, last pushed 6mo ago), licensed MIT. It adds 1,872 tokens to every session, about $0.0094 per session on Opus 5. A static security scan graded it A with 1 finding (runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.