What is hash CLAUDE.md?

Repository guidance for Hash, a Go-based command-line shell with built-in AI features and support for connecting to different agents. It covers the project layout, build and test commands, and fuzz testing, which checks how code handles many unexpected inputs.

Use it when working on Hash, especially its parser, learning system, agent connections, configuration, or command-line interface.

It gives a coding agent the project context and the commands needed to build, test, inspect, and safely change the code.

How tfcace/hash configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to tfcace/hash. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/tfcace/hash/master/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/tfcace/hash

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/tfcace/hash/claude-md/github.svg)](https://agentmods.dev/instructions/tfcace/hash/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/tfcace/hash/claude-md"><img src="https://agentmods.dev/badge/instructions/tfcace/hash/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/tfcace/hash/claude-md"><img src="https://agentmods.dev/badge/instructions/tfcace/hash/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,137 This file is loaded in full into every session.

When invoked 1,137 The same file — it is already loaded in full.

Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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	$0.01137	$0.01137
Opus 5.5	$0.00455	$0.00455
Sonnet 5.5	$0.00227	$0.00227
Haiku 4.5	$0.00114	$0.00114

Measured 1mo ago against content hash 28e41d41308a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

hash CLAUDE.md scanned grade B 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 1mo 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.

Asks for rootmediumPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

│ ├── history/ # SQLite history, sudo tracking

CLAUDE.md · 104 lines

How it starts

The opening of the file, as written. The whole thing — 104 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Project Overview

Hash (Harness Assisted SHell) is an AI-powered shell written in Go with ACP (Agent Client Protocol) integration. It provides a Warp-like intelligent experience while being agent-agnostic, local-first, and protocol-based.

Build Commands

go build -o hash ./cmd/hash      # Build binary
go test ./...                     # Run all tests
go test ./internal/parser/...     # Run tests for a specific package
go test -run TestName ./...       # Run a single test
go vet ./...                      # Lint

# Fuzz testing (parser and learning system)
go test -fuzz=FuzzParse -fuzztime=30s ./internal/parser/...
go test -fuzz=FuzzNormalizeError -fuzztime=30s ./internal/learning/...

Architecture

hash/
├── cmd/hash/          # Main entry point
├── internal/
│   ├── agent/         # ACP client, StdioTransport, HTTPTransport
│   ├── clipboard/     # Copy command/output buffer
│   ├── completion/    # Three-tier completion router
│   ├── config/        # TOML configuration parsing
│   ├── context/       # Context picker TUI
│   ├── executor/      # POSIX interpreter (mvdan/sh), PTY-on-demand
│   ├── history/       # SQLite history, sudo tracking
│   ├── learning/      # Error pattern learning, fix suggestions
│   ├── parser/        # ?? detection and command parsing
│   ├── progress/      # OSC 9;4 progress bar support
│   ├── prompt/        # Starship + built-in prompt engines
│   ├── readline/      # Input, Emacs/Vim/Helix keybindings
│   └── shell/         # REPL, builtins, agent integration
└── go.mod

Agent Invocation

Use ?? to invoke the agent:

?? find large files - Full agent request
cmd | ?? filter output - Pipe command output to agent
cmd --flag=?? description - Inline completion

Key Design Decisions

Agent invocation: ?? prefix (not #). Supports ?? <prompt> at line start, cmd | ?? <prompt> for pipe completion, and cmd ?? <prompt> for inline completion.

Read the full file on GitHub · 104 lines

Changes

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.

1mo ago First seen · 104 lines · 1,137 tokens per session scan B 28e41d41308a

Subscribe to this mod's changes

hash CLAUDE.md is an instructions file published in the GitHub repository tfcace/hash (33 stars, last pushed 2d ago), licensed MIT. It adds 1,137 tokens to every session, about $0.0045 per session on Opus 5.5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Claude Code acp agent-client-protocol ai bubbletea cli

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).

microsoft/vscode · 9,715 tokens

hash: Instructions file for Claude Code