🐙 Omni Coder

An AI coding agent that plans, edits, and tests code by driving Qwen Coder (or any OpenAI-compatible model) through a scoped set of file and shell tools, with human approval on every write, edit, or shell command.

📦 Install

pip install omni-coder
ollama pull qwen3-coder:30b   # example: pulling the default model via Ollama

▶️ Usage

omni "Add type hints to utils.py, then run the test suite" \
    --project-root ./myrepo

Equivalent: python -m omni "..." --project-root ./myrepo.

Omit the task string to enter an interactive session instead:

omni --project-root ./myrepo

Run omni --help for the full option list.

✨ Features

• Structured intent parsing — the raw task is classified (bug fix, feature, refactor, risk level, target files) before any action is taken, and high-risk tasks force human approval even under --auto-approve.
• Session persistence — every message is saved to SQLite as the run happens. Resume a previous run by id or a name you gave it (--resume), browse saved sessions (--list-sessions), or delete one (--delete-session).
• Interactive mode — drop into a REPL that keeps the model connection and tool session alive across turns. Ctrl-C during a running turn cancels just that turn instead of killing the session — you land back at the prompt and can keep going. Type / for a completion menu of every command, including /model (switch models) and /server:prompt (run an MCP prompt template).
• Automatic context compaction — once the running conversation exceeds --context-char-budget (default 200k chars), older messages are replaced with an LLM-written summary instead of growing forever or being silently dropped. Trigger it manually anytime with /compact.
• Human-in-the-loop approval — every write, edit, or shell command shows a diff or command preview before you confirm (diffs render with line numbers and red/green highlighting), unless explicitly marked safe or run with --auto-approve.
• Retry and recovery — transient model failures retry with backoff; malformed tool-call output is caught and reported back to the model instead of crashing the run.
• Codebase exploration tools — regex content search with glob filtering, pattern-based file discovery, directory listing, and a full git toolset (status/log/diff/show/branch/fetch read-only; add/commit/ pull/push approval-gated), all skipping noise directories (.git, node_modules, build output).
• Persistent project memory — the agent can save durable notes (a save_memory tool call) to a per-project agent_memory.md, auto-loaded into the system prompt at the start of every new session.
• Extensible via custom MCP servers — point at any MCP server, local (stdio) or remote (SSE / Streamable HTTP), and its tools merge into the model's toolset automatically, no code changes required. Register one permanently (--add-mcp-server, available on every future run) or add one per run (--mcp-server/--mcp-config). One server failing to connect doesn't take down the session — check /mcp for live ✅/❌ status per server, and --mcp-log-path for their stderr output.
• Deferred tool loading + semantic search_tools — register a custom MCP server with --defer and its tools stay out of the model's context until a synthesized search_tools tool loads matching ones on demand, ranked by on-device embeddings (nomic-local, default) or a remote OpenAI-compatible embedding model, with automatic keyword-match fallback.

🏗️ Architecture

Tools are served over the Model Context Protocol (MCP), not called in-process — the agent is an MCP client that talks to a tool server over stdio:

+-----------------------------+
|          CLI / REPL         |
+-----------------------------+
               |
               v
+-----------------------------+
|          Agent loop         |
|  parse intent, call model,  |
|  approve, execute, persist  |
+-----------------------------+
               |
               v
+-----------------------------+
|          MCP client         |
|  built-in + custom servers  |
|  merged into one tool list. |
| "defer"-registered servers  |
| hold tools back for on-     |
| demand search_tools lookup  |
+-----------------------------+
               |
 stdio / SSE / streamable-http
               v
+-----------------------------+
|        MCP server(s)        |
+-----------------------------+
               |
               v
+-----------------------------+
|            Tools            |
|    read / write / edit /    |
|        search / shell       |
+-----------------------------+

Because tools are exposed over MCP, any MCP-compatible client — Claude Desktop, another agent framework, a different model entirely — can reach the exact same toolset, approval-preview logic, and path scoping. The reverse also holds: any additional MCP server — local (stdio) or remote (SSE / Streamable HTTP) — can be plugged into this agent, and its tools merge into the same list the model already sees —

omni --add-mcp-server "weather=python -m weather_mcp_server"     # local, stdio
omni --add-mcp-server "weather=https://example.com/mcp/sse"      # remote, SSE
omni "what's the forecast?"   # picked up automatically, every run from here on

A value after name= starting with http:///https:// is treated as a remote server (SSE by default, append ,streamable_http for that transport instead); anything else is a local command spawned over stdio — it doesn't need to be -m-invokable, a standalone script's absolute path works too (e.g. "myserver=python C:/absolute/path/to/mcp_server.py").

Append ,defer (or pass --defer with --add-mcp-server) to keep a server's tools out of the model's default tool list — it discovers them on demand via search_tools, ranked semantically by default (pip install "omni-coder[local-embeddings]" for on-device embeddings, or point --embedding-model at a remote one instead; --embedding-model "" falls back to plain keyword matching). See the full README for details.

⚙️ Configuration

Point at any OpenAI-compatible host with --llm-host or the LLM_HOST env var. If it sits behind an authenticated proxy, set LLM_API_KEY as an environment variable rather than a CLI flag so the key doesn't end up in shell history. Seeing repeated retries in the terminal? That's usually a client-side timeout, not a dead server — raise it with --llm-timeout <seconds> (default 300).

🔗 Links

Source, full documentation, and issue tracker: https://github.com/HarryChen1995/omni-coder

📄 License

MIT