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Forge AI

Forge AI (ForgeCode) is a CLI-based AI coding harness — a competitor to Claude Code with first-class support for many AI providers. It works with cloud models, open-weight models, and local models.

Website: https://forgecode.dev

Agents

Forge provides three built-in agents:

Agent Access Purpose
muse read + write Planning and analysis — reviews impact, plans changes
forge read + write Implementation — makes changes, fixes bugs (default)
sage read Research — used internally by muse/forge for codebase understanding

Typical workflow: use muse to plan, switch to forge to implement.

Switch agents with :agent, :muse, :forge.

Custom Agents

Create agents as markdown files with YAML frontmatter in .forge/agents/ (project) or ~/forge/agents/ (global).

---
id: my-agent
title: My Agent
description: Brief description
tools: [read, search, shell]
model: claude-sonnet-4
provider: anthropic
temperature: 0.1
---
System prompt here.

Tools: read, write, patch, shell, search, fetch, remove, undo, or "*" for all.

Custom Commands

Repeatable workflows as slash commands in .forge/commands/:

---
name: check
description: Runs lint and tests before commit
---
Run `lint` and `test`, fix any issues found.
<lint>cargo clippy --fix</lint>
<test>cargo test</test>

Invoke with :check in the Forge chat.

MCP Integration

Connect external tools via .mcp.json:

{
  "mcpServers": {
    "browser": {
      "command": "npx",
      "args": ["@playwright/mcp@latest"]
    }
  }
}

Manage with forge mcp import, forge mcp list, forge mcp remove, forge mcp reload.

Environment Variables

Variable Default Purpose
FORGE_TERM on Terminal context capture — passes command history to the model
FORGE_TERM_MAX_COMMANDS 5 History buffer size
FORGE_CONFIG ~/forge/ Config directory (for dotfiles repos)
FORGE_BIN forge Binary path (for local builds or version switching)

$FORGE_TERM

On by default. The Zsh plugin tracks what commands you run, whether they succeeded, and passes that to ForgeCode on every : invocation. Means forge fix it already knows what failed — no need to narrate.

Disable per-session: export FORGE_TERM=false

Forge Services

Optional backend for enhanced capabilities: context engine (semantic search), tool-call guardrails, and skill engine. Enable with :login → select ForgeServices.

Index project with :sync, check status with :sync-status.

Setup

# 1. Install
curl -fsSL https://forgecode.dev/cli | sh

# 2. Zsh plugin
forge zsh setup

# 3. Login to provider
:login

# 4. Pick model
:model

# 5. First prompt
: Hi!

Requires: Nerd Font, Zsh.

Skills

ForgeCode skills are markdown files (.forge/skills/) that provide reusable workflows. Similar to custom commands but more powerful — skills can use templating and conditional logic.

Configuration Files

File Purpose
.forge.toml Main config ( ForgeConfig dir)
.mcp.json MCP server definitions
.forge/agents/ Custom agent definitions
.forge/commands/ Custom slash commands
.forge/skills/ Reusable skill workflows
AGENTS.md Project-wide rules for all agents