gnoma

A provider-agnostic agentic coding assistant in Go. gnoma routes each prompt to the best available model — cloud or local — through a multi-armed bandit router, executes tools on your behalf, and stays extensible through hooks, skills, MCP servers, and plugins.

Named after the northern pygmy-owl (Glaucidium gnoma); agents are called elfs (elf owl).

• Upstream: https://somegit.dev/Owlibou/gnoma
• GitHub mirror: https://github.com/VikingOwl91/gnoma

---

Install

Pre-built binary (no Go toolchain required)

Releases are built by GoReleaser for linux, darwin, and windows × amd64/arm64 as static (CGO_ENABLED=0) archives. Grab the one matching your OS/arch from https://github.com/VikingOwl91/gnoma/releases:

# Linux/macOS one-liner (substitute the asset URL):
curl -fsSL <ARCHIVE_URL> | tar -xz -C /tmp
sudo mv /tmp/gnoma /usr/local/bin/
gnoma --version

Windows: download the _windows_*.zip, extract gnoma.exe, and put it on %PATH%.

Docker

Multi-arch images (linux/amd64, linux/arm64) are published to GitHub Container Registry on each tagged release:

docker pull ghcr.io/vikingowl91/gnoma:latest
docker run --rm -it -v "$PWD:/workspace" ghcr.io/vikingowl91/gnoma:latest --version

Mount your project as /workspace (the image's working directory) and pass any provider keys via -e VAR_NAME — see the Providers table for env-var names.

Go users

go install somegit.dev/Owlibou/gnoma/cmd/gnoma@latest   # latest tagged
go install somegit.dev/Owlibou/gnoma/cmd/gnoma@main     # bleeding edge

Build from source

git clone https://somegit.dev/Owlibou/gnoma && cd gnoma
make build       # → ./bin/gnoma
make install     # → $GOPATH/bin/gnoma

Requires Go 1.26+.

---

Quickstart

Set at least one provider key (env var names are listed in the Providers table below) — or run a local model and skip the keys entirely.

gnoma                              # interactive TUI
echo "list files" | gnoma          # pipe / one-shot mode
gnoma --provider ollama            # use a local model (no API key needed)
gnoma --version

Inside the TUI, Ctrl+X toggles incognito (no session saved, no router learning); /help lists slash commands; Esc cancels an in-flight turn.

---

Vision / image input

Ctrl+V in the TUI pastes a screenshot from the system clipboard: gnoma writes the bytes to your user cache and inserts a [Pasted image #imgN] placeholder, which expands to [Image: /path] when the turn is sent. You can also type a literal [Image: /path] marker anywhere in a prompt to reference an existing file:

explain this error [Image: /tmp/screen.png] — what's the root cause?

Image markers are parsed by the engine, files larger than 10 MiB are skipped (the marker stays as plain text), and the router only routes vision-tagged turns to arms that declare the Vision capability (Anthropic, OpenAI, Google, and Ollama models that advertise multimodal support). Image paste is disabled under --incognito to honour the no-persistence contract.

---

Providers

Provider	Env var	Default model	Also available
Anthropic	ANTHROPIC_API_KEY	claude-sonnet-4-6	claude-opus-4-7, claude-haiku-4-5-20251001
OpenAI	OPENAI_API_KEY	gpt-5.5	gpt-5.5-pro, gpt-5.2, gpt-5.2-chat-latest
Google (Gemini)	GEMINI_API_KEY (alt: GOOGLE_API_KEY)	gemini-3.5-flash	gemini-3.1-pro-preview, gemini-3.1-flash-lite
Mistral	MISTRAL_API_KEY	mistral-large-latest (Mistral Large 3)	mistral-medium-3.5, magistral-medium-2509
Ollama (local)	—	qwen3:8b (override with --model)	any model on your Ollama instance
llama.cpp (local)	—	reported by /v1/models	n/a
Subprocess (claude, gemini, agy, codex, vibe CLIs)	provider-specific	binary name	configurable via [cli_agents]

Override per-invocation:

gnoma --provider anthropic --model claude-opus-4-7
gnoma --provider openai    --model gpt-5.5-pro     # GPT-5.5 is the default; pro is the higher-accuracy tier
gnoma --provider google    --model gemini-3.1-pro-preview
gnoma --provider ollama    --model qwen2.5-coder:3b
gnoma --provider llamacpp                          # model picked from server

gnoma providers prints every discovered provider, model, and CLI agent.

Subprocess sandbox bypass. The agy and codex CLIs each run with their respective sandboxes enabled by default. Two env vars exist for the rare case where a sandbox blocks legitimate work (e.g., reading files outside the project root):

Env var	Effect
GNOMA_AGY_BYPASS_PERMISSIONS=1	Skip agy's permission prompts
GNOMA_CODEX_BYPASS_SANDBOX=1	Disable codex's filesystem sandbox

These are footguns — set them deliberately, per-invocation. They do not disable gnoma's own permission system, hooks, or firewall.

Local models

Start your local server, then point gnoma at it:

# Ollama (default http://localhost:11434/v1)
ollama pull qwen2.5-coder:3b
gnoma --provider ollama --model qwen2.5-coder:3b

# llama.cpp (default http://localhost:8080/v1)
llama-server --model /path/to/model.gguf --port 8080 --ctx-size 8192
gnoma --provider llamacpp

Override the endpoint in .gnoma/config.toml:

[provider.endpoints]
ollama   = "http://myhost:11434/v1"
llamacpp = "http://localhost:9090/v1"

---

Config

Configuration merges (lowest → highest priority):

1. Built-in defaults
2. ~/.config/gnoma/config.toml — global base
3. ~/.config/gnoma/profiles/<name>.toml — active profile (when profile mode is enabled)
4. <projectRoot>/.gnoma/config.toml — project override
5. Environment variables (GNOMA_PROVIDER, GNOMA_MODEL, *_API_KEY)

Example global config:

[provider]
default = "anthropic"
model   = "claude-sonnet-4-6"

[provider.api_keys]
anthropic = "${ANTHROPIC_API_KEY}"

[provider.endpoints]
ollama   = "http://localhost:11434/v1"
llamacpp = "http://localhost:8080/v1"

[permission]
mode = "auto"      # default | accept_edits | bypass | deny | plan | auto

[session]
max_keep = 20      # sessions retained per project

Profiles

Drop multiple configs under ~/.config/gnoma/profiles/ and switch with --profile <name> or /profile <name>. Each profile keeps its own router quality data and session history. Full details: docs/profiles.md.

---

SLM (small-language-model) routing

gnoma can run a tiny local model alongside the main provider to:

• Classify each prompt (task type + complexity + tool requirement) so the router picks the right arm.
• Execute trivial tasks itself (knowledge questions, single file reads, anything with complexity ≤ 0.3), keeping the heavy provider for real work.

[slm]
enabled = true
backend = "auto"           # ollama | llamacpp | llamafile | openaicompat | auto | disabled
model   = "reecdev/tiny3.5:500m"

Setup, presets, and verification: docs/slm-backends.md. The auto backend probes Ollama → llama.cpp → llamafile on startup and picks the first reachable option. Inspect with gnoma slm status and gnoma router stats.

---

Session persistence

Sessions are auto-saved per project under .gnoma/sessions/<id>/ after each completed turn. On a crash you lose at most the current in-flight turn.

gnoma --resume              # interactive picker
gnoma --resume <id>         # restore by ID
gnoma -r                    # shorthand
gnoma --incognito           # no save, no router learning

Inside the TUI: /resume, /resume <id>, Ctrl+X (incognito toggle).

Router-quality data (EMA scores) is stored at ~/.config/gnoma/quality.json (or quality-<profile>.json in profile mode).

---

Extensibility

MCP servers

Connect any MCP-compatible server:

[[mcp_servers]]
name    = "git"
command = "mcp-server-git"
args    = ["--repo", "."]
timeout = "30s"

# Optionally replace a built-in tool with an MCP one
[mcp_servers.replace_default]
exec = "bash"

MCP tools appear as mcp__{server}__{tool} unless mapped via replace_default.

Skills

Drop markdown files into .gnoma/skills/ or ~/.config/gnoma/skills/. Invoke with /<skill-name>. List with /skills.

Hooks

Shell commands run on tool events (pre_tool_use, post_tool_use, etc.):

[[hooks]]
name         = "block-rm-rf"
event        = "pre_tool_use"
type         = "command"
exec         = "bash-safety-check.sh"
tool_pattern = "bash*"

Ordering rules: ADR-004.

Plugins

Plugins bundle skills, hooks, and MCP server configs. Drop a plugin directory into ~/.config/gnoma/plugins/ (global) or <project>/.gnoma/plugins/ (project-local); gnoma auto-discovers them on startup.

Each plugin's plugin.json is pinned by SHA-256 on first load (Trust-On-First-Use). A manifest that changes between runs is refused with a clear error and a re-enrolment hint. Full model: docs/plugins-trust.md and ADR-003.

Elfs (sub-agents)

The spawn_elfs tool decomposes work into parallel sub-tasks. See internal/skill/skills/batch.md for the built-in batching skill.

---

Subcommands

Command	What it does
gnoma providers	List every discovered provider, model, and CLI agent
gnoma profile list / show <name>	Profile diagnostics
gnoma router stats	Quality EMA + classifier source breakdown
gnoma slm setup / slm status	Manage the llamafile-backed SLM

gnoma --help for the full flag set.

---

Security

gnoma runs tools and shell commands on your behalf. The internal/security package canonicalises every path (TOCTOU-safe), gates network access through a configurable firewall, and scans tool output for secrets before it ever reaches the model. The SafeProvider boundary keeps incognito-mode data out of long-lived stores.

Entropy false-positive reduction

The secret scanner also computes Shannon entropy on long unstructured tokens to catch unknown-format secrets. Under a lowered threshold or redact_high_entropy = true, this can fire on shapes that are never secrets (UUIDs, SHA digests, ISO-8601 timestamps, URLs). Opt into the format-aware safelist to skip them:

[security]
entropy_threshold    = 3.5
redact_high_entropy  = true
entropy_safelist     = ["uuid", "sha_hex", "iso8601", "url"]

Default is an empty list — pre-safelist behaviour. Skips are logged (Debug-level, per pattern, token length only — never the bytes) so the real false-positive rate is measurable on real workloads.

Architecture references:

• docs/essentials/INDEX.md — full architecture map
• docs/essentials/decisions/ — ADRs 001–004

---

Development

make build          # ./bin/gnoma
make test           # unit tests
make test-integration  # //go:build integration — requires real API keys
make cover          # coverage.html
make lint           # golangci-lint
make check          # fmt + vet + lint + test

Architecture, conventions, and TDD workflow: CONTRIBUTING.md.

---

License

Apache License 2.0. See LICENSE and NOTICE.