prompt-forge-claude-code

prompt-forge-claude-code

Automatic prompt enhancement for Claude Code. Enhances your prompts via Claude Haiku and presents both versions for you to choose from — full visibility, full control. Also includes a manual /forge skill for on-demand enhancement.

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How It Works

prompt-forge operates in two modes:

Auto Mode (Default)

A UserPromptSubmit hook intercepts your prompt, enhances it via Claude Haiku (~2s), and presents both versions for you to choose from. You stay in control.

You type: "fix the auth bug"
        |
        v
Hook fires → Haiku enhances (~2s)
        |
        v
Claude shows you:
  ┌─────────────────────────────────────────────────┐
  │  Prompt Forge enhanced your request:             │
  │                                                  │
  │  Original: "fix the auth bug"                    │
  │                                                  │
  │  Enhanced: "Fix the auth bug in the login        │
  │  handler — check for null session, incorrect     │
  │  password comparison, or missing error handling.  │
  │  Ensure existing tests pass."                    │
  │                                                  │
  │  1. Use enhanced                                 │
  │  2. Use original                                 │
  │  3. Edit                                         │
  └─────────────────────────────────────────────────┘
        |
        v
You choose → Claude proceeds with your choice

Your prompt is never silently modified. You always see the enhancement and decide what happens next.

Manual Mode (/forge)

Type /forge <your prompt> in Claude Code for an on-demand enhancement:

/forge fix the auth bug

Claude will show you a before/after comparison and ask if you want to use the enhanced version.

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Installation

Inside a Claude Code session:

/plugin marketplace add Yamparala-Venkata-Gopi/prompt-forge-claude-code

/plugin install prompt-forge-claude-code@prompt-forge-claude-code

Prerequisites

• Claude Code installed and authenticated
• Python 3.8+ available as python3
• Anthropic API key set via one of:
  • ANTHROPIC_API_KEY environment variable (recommended)
  • ~/.claude/.credentials.json file (Linux/Windows, auto-detected)
  • macOS keychain (auto-detected)

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Uninstall

/plugin uninstall prompt-forge-claude-code@prompt-forge-claude-code

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Configuration

Environment Variables

Variable	Values	Default	Description
PROMPT_FORGE_DISABLED	1, true, yes	unset	Disable all prompt enhancement
PROMPT_FORGE_MODE	auto, off	auto	auto = silent hook enhancement; off = disable hook
ANTHROPIC_API_KEY	API key string	unset	Anthropic API key for Haiku calls

When Prompts Are Skipped

The hook silently skips enhancement for:

• Empty prompts or whitespace only
• Short prompts under 4 words
• Simple confirmations: yes, no, ok, done, continue, y, n, etc.
• Slash commands starting with /
• Already-detailed prompts over 600 characters
• When PROMPT_FORGE_DISABLED=1
• When PROMPT_FORGE_MODE=off

Cost

Uses Claude Haiku -- the fastest and cheapest Claude model. Typical cost per enhancement: less than $0.001.

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Cross-Platform Support

prompt-forge works on macOS, Linux, and Windows (via WSL or Python).

• API key resolution checks env var, credentials file, and macOS keychain in order
• No platform-specific tools required (no gum, no /dev/tty)
• Python stdlib only -- zero external dependencies

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Plugin Structure

prompt-forge-claude-code/
  .claude-plugin/
    plugin.json              Plugin manifest
    marketplace.json         Marketplace metadata
  agents/
    prompt-forge.md          Agent definition (uses Haiku)
  skills/
    prompt-enhance/
      SKILL.md               /forge skill definition
  hooks/
    hooks.json               UserPromptSubmit hook config
    enhance_prompt.py        Core hook script (Python)
  tests/
    test_enhance_prompt.py   Unit tests (60 tests)
  CHANGELOG.md               Version history and upgrade notes
  README.md
  package.json

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Upgrading from v1

v2 is a complete redesign. The hook no longer uses TTY-based interactive menus (which were incompatible with the Claude Code hook system). Instead, Claude itself presents the enhancement and lets you choose.

# 1. Update the plugin
/plugin update

# 2. Reload to pick up new hook + skill files
/reload-plugins

That's it. Your existing PROMPT_FORGE_DISABLED env var still works. See CHANGELOG.md for full details.

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Development

Run tests

python3 tests/test_enhance_prompt.py

All 60 tests use mocks — no API key or network access required.

Test locally in Claude Code

claude --plugin-dir /path/to/prompt-forge-claude-code

Then type any prompt with 4+ words to see the enhancement flow.