Extension

Use LunaRoute from OpenCode in under a minute: log in, and every LunaRoute model shows up automatically — correctly configured and ready to use. No hand-editing of opencode.json, no copying API keys around. The hosted LunaRoute MCP server (image generation and more) is wired up for you too.

Why

• Zero-config models. LunaRoute's model catalog is synced into OpenCode automatically — context windows, token limits, reasoning, and vision capabilities all come through pre-mapped. Run /models and pick a lunaroute/* model. The catalog is fetched when OpenCode loads your config, so new models appear after a restart (or a new login) as soon as they ship.
• Login that doesn't leak keys. Browser-based login (PKCE) issues a fresh lr_ key and stores it in ~/.local/share/opencode/auth.json — OpenCode's own credential store. The plugin never writes your key to any other file. Prefer a key you already have? Paste it (it's validated against the gateway before it's accepted).
• LunaRoute MCP built in. When you're logged in, the hosted LunaRoute MCP server is registered in your live session config so tools like generate_image are callable from OpenCode. Nothing is written to your config files.
• Web search built in. A first-class web_search tool (LunaRoute-hosted) is registered when you're logged in — the same backend the MCP server offers, with the same attribution, called directly. OpenCode's builtin websearch needs opencode-native providers or Exa/Parallel keys; this one needs nothing but your login.
• Attribution on every request. Each LunaRoute request carries a per-session agent + session id so traffic is traceable on the LunaRoute side.

Requirements

• OpenCode >= 1.14.49.
• A LunaRoute account with access to at least one organization.
• Linux or macOS. (Windows is untested and unsupported in v1.)

Quick start

Add the plugin to your OpenCode config — the global ~/.config/opencode/opencode.json or a project opencode.json (or .opencode/opencode.json) in the project root. OpenCode reads all of them; the project one wins on conflicts. (Do not use the config.json that OpenCode writes per instance — it is not a plugin source.)

{
  "$schema": "https://opencode.ai/config.json",
  "plugin": ["@lunaroute/opencode-extension"]
}

Previously installed an older release? Clear OpenCode's plugin cache first — see Troubleshooting.

Then in OpenCode:

/connect

Choose LunaRoute, then Log in with browser (a browser opens to https://app.lunaroute.com/device-auth/opencode; after you approve, an API key is issued and stored) or Paste an API key (paste an existing lr_... key). If you haven't already set a default model, the first LunaRoute model is picked for you — run /models only if you want to choose a different one. The pick is recorded in the instance log so you can see what happened.

On a headless machine (or when your browser is on another computer), choose Log in from a remote browser instead: open the URL it shows in any browser and approve there, then paste back what the approval page gives you — its curl command, the callback URL, its ?code=...&state=... part, or a bare code all work. The callback URL is a 127.0.0.1 address; opening it on the remote machine fails to load — that's expected. Codes are short-lived: paste promptly. A failed paste ends the flow (OpenCode cannot re-prompt) — re-run /connect for a fresh code; the instance log carries the exact reason.

Before your first login, /models shows a single LunaRoute entry — Log in to load models. That placeholder is intentional: it keeps LunaRoute visible in /connect (OpenCode hides providers that have no models). Selecting it before logging in just fails with a 401; log in via /connect and it is replaced by the real catalog.

LunaRoute MCP tools

When you are logged in, the extension registers the hosted LunaRoute MCP server (https://mcp.lunaroute.com/mcp) in the live session config — tools (in v1: generate_image) become callable from OpenCode. The entry exists only in memory for the session: it is never written to opencode.json or any other config file, and your lr_ key is never persisted anywhere outside OpenCode's own auth store.

• Logged out: no registration occurs (silent). Log in with /connect.
• After login or key rotation: MCP refreshes automatically when the instance reloads (the reload that follows the post-login default-model update); a new key is picked up on the next instance without a process restart. Restarting also works, but is not required.

Duplicate surface — endgame note. The first-class tool set now covers every capability the hosted MCP server offers: web_search (+ web_fetch when it ships), generate_image, edit_image, upload_image, and convert_document. The MCP server stays registered under prefixed names (lunaroute_web_search, lunaroute_generate_image, …) for compatibility — user scripts and flows may reference those names — and so that tools the server adds later are available immediately, before a first-class port lands. OpenCode's MCP config cannot filter individual tools of a registered server; to suppress the MCP surface entirely, diverge the mcp.lunaroute entry (see MCP entry management).

MCP entry management

The plugin recognizes its own mcp.lunaroute entry by its shape (remote + the LunaRoute MCP URL + the expected headers). Two consequences:

• If you hand-write a mcp.lunaroute entry that matches that shape, the plugin treats it as its own and refreshes its header values (credential
  • attribution) whenever you're logged in.
• To keep OpenCode from managing an entry, make it diverge — set "enabled": false (keeps the entry but stops the plugin from touching it) or point it at a different URL. Adding extra headers is not recommended as an opt-out: they would be forwarded to the MCP server.

A mcp.lunaroute entry that doesn't match the plugin's shape is always left untouched.

Any-name servers at the hosted URL win

The defer rule also covers differently-named entries: if any MCP server in your config points at the hosted LunaRoute MCP URL (regardless of its name, compared modulo case and trailing slashes), the plugin does not register its own mcp.lunaroute — your server wins, and the plugin logs a one-time notice. Without this, the model would see two copies of every hosted tool with divergent credentials (your static key vs the plugin's rotated one), and only the plugin's would carry the attribution headers.

Note the trade-off: your entry's key is static — after a rotation, edit it (or remove it and let the plugin re-register with the fresh key). If the plugin had registered earlier in the session, it removes its own duplicate when your entry appears (only ever touching entries it placed itself).

Settings

User preferences live in $XDG_DATA_HOME/opencode/lunaroute.json (default ~/.local/share/opencode/lunaroute.json — next to the auth store, mirroring pi's layout). The file is the source of truth and every consumer re-reads it: provider selection follows the file on the very next tool call.

Key	Values	Default	Controls
mcp	"on" / "off"	"on"	mcp.lunaroute registration
webTools	"on" / "off"	"on"	first-class web_search / web_fetch
searchProvider	"server" / "brave" / "exa" / "kagi"	"server"	default search provider (server = omit → server default)
imageTools	"on" / "off"	"on"	first-class image tools (when they land)
convertTools	"on" / "off"	"on"	first-class document conversion (when it lands)

Environment escape hatches only ever disable (values off, 0, false): LUNAROUTE_WEB_TOOLS, LUNAROUTE_IMAGE_TOOLS, LUNAROUTE_CONVERT_TOOLS.

• Tolerant reader: an unreadable or malformed file falls back to defaults and logs one warn line — it never crashes the session. Invalid single values fall back per key, silently.
• Live apply: provider selection applies to the very next tool call with no reload. Registration-time gates (web tools, MCP) re-evaluate when the instance reloads — a restart, a login, or any config change does it (the plugin's own post-login config write triggers exactly this).
• Isolation: turning mcp off never affects models or the web tools — each contributor gates independently.

/lunaroute settings command (TUI)

The package ships a TUI plugin (exports["./tui"]) that registers a /lunaroute slash command: it lists the five settings with their current values, and selecting one changes it — write-first, then the live-apply reload (a failed write never triggers the reload). It runs in the TUI process, outside the prompt loop, so it never spends a model turn.

Loading status — unverified. In the 7pd6 spike the external TUI module was never imported on OpenCode 1.18.30 despite a correct manifest and tui.json (the server half of the same package loaded, and opencode's own TUI-plugin commands rendered). The spike could not distinguish a broken loader from the unpublished/local-spec install used in the sandbox; a real published install may work. Until smoke item T1 confirms it, treat the lunaroute.json file + env hatches below as the supported interface and the command as best-effort. See docs/tui-plugin-loading-spike.md.

TUI plugins are declared in tui.json, not opencode.json:

// ~/.config/opencode/tui.json  (global)  or  <project>/.opencode/tui.json
{ "plugin": ["@lunaroute/opencode-extension"] }

opencode plugin @lunaroute/opencode-extension writes that entry for you (it detects the server + TUI targets from the package manifest).

Headless / no TUI: the command is simply absent — settings stay fully functional as the lunaroute.json file plus the env hatches above. Edit the file and restart (or trigger any config change) to apply registration-time gates; nothing depends on the TUI plugin.

Web search (web_search)

When you're logged in and the hosted LunaRoute MCP server offers it, the extension registers a first-class web_search tool — same backend as the MCP server, same attribution headers, but called directly (no mcp.lunaroute dependency). A companion web_fetch tool registers the same way once the hosted server ships one (it hasn't yet; registration is driven by the server's tools/list on every session start).

• Provider: the per-call provider argument wins; otherwise the searchProvider setting from ~/.local/share/opencode/lunaroute.json (brave / exa / kagi; server = the server default), re-read on every call — a change applies to the very next search. Absent everywhere → the server default.
• Key rotation: the current key is re-read from OpenCode's auth store on every call — once the tool is registered, a rotated key is used by the next search without any restart.
• Login mid-session: tools register at session start; after a fresh login they appear on the next instance reload (a restart always works).
• Logged out: not registered. If you log out mid-session, an already-registered tool fails with a "run /connect" error instead of silently using a stale key.

Settings and escape hatches (the file is the source of truth; the env var only ever disables):

Variable	Effect
LUNAROUTE_WEB_TOOLS=off (also 0 / false)	Never register the web tools

File (~/.local/share/opencode/lunaroute.json)	Effect
{"webTools": "off"}	Never register the web tools
{"searchProvider": "brave"}	Default provider for every search (per-call arg still wins)

Notes and limits:

• Coexistence with the builtin websearch: OpenCode's builtin stays untouched (it only appears for opencode-native providers or with Exa/Parallel API keys set); both can be visible under different names.
• Other plugins: pi's extension detects other web-search tools and stays silent; OpenCode plugins cannot enumerate tools, so this extension registers unconditionally. If another plugin also registers web_search, both will exist (host precedence for that case is unverified).
• The MCP duplicate: web_search and the MCP server's lunaroute_web_search are the same backend; the MCP registration stays because it serves tools the first-class set does not cover (and OpenCode's MCP config cannot filter individual tools). To suppress the MCP surface, diverge the mcp.lunaroute entry (see MCP entry management).

Image tools

When you're logged in and the hosted LunaRoute MCP server offers them, the extension registers first-class generate_image, edit_image, and upload_image tools (same gate as the web tools: settings + valid key + the server's tools/list, checked on every session start).

• Images you can see: generated and edited images are saved locally (temp-then-rename, so a cancelled call never leaves a partial file) and returned as a file:// attachment — vision models see the actual image, not just a URL. The server's own result lines are never rewritten; the local path is appended (saved to: …, or not saved locally — fetch the url before it expires).
• Per-org models: the model parameter's allowed values come from the server's tools/list (per-org entitlement, with per-model limit hints in the description) — re-probed on every session start, so catalog changes apply on the next instance.
• upload_image is local-safe by construction: the file is sniffed by magic bytes (png/jpeg/webp) before any bytes leave the machine, read through a bounded descriptor read (at most the 11 MiB ceiling + 1 byte ever enters memory, however the file changes mid-read), and ids are validated (img_… only) before anything touches a filesystem path.
• Save location: $XDG_DATA_HOME/opencode/lunaroute-images (default ~/.local/share/opencode/lunaroute-images), override with LUNAROUTE_IMAGE_DIR. Saved images are private by default (dir 0700 / files 0600); the plugin-owned default directory is hardened on every save, while an explicit LUNAROUTE_IMAGE_DIR is respected as-is (user-managed).
• Key rotation: the current key is re-read on every call — no restart needed.
• Disable: LUNAROUTE_IMAGE_TOOLS=off / {"imageTools": "off"} — same semantics as the web tools.

Document conversion

When you're logged in and the hosted LunaRoute MCP server offers it, the extension registers a first-class convert_document tool: documents (Word, PowerPoint, Excel, OpenDocument, RTF, EPUB, CSV, PDF) and raster images (always OCR'd server-side) become Markdown, returned inline.

• Local safety first: files are sniffed by content (ZIP-family / PDF / RTF magics, strict UTF-8 for text) before any bytes leave the machine. Plain text uploads only when it is genuinely CSV — from a .csv path, or an extensionless path with an explicit .csv filename. Dotfiles and hidden path components (.ssh, .aws, …) never leave as text, whatever they claim; binaries are content-sniffed, never name-trusted (a PNG named notes.csv is converted as an image, not read as text).
• Size: files over the 10 MiB conversion ceiling are rejected before upload (checked on the bytes actually read, so a swapped file can't sneak through).
• Oversized output: when the server stores the result as an artifact (output_too_large), the tool retries once with embed: false, downloads the artifact, and saves it to $XDG_DATA_HOME/opencode/lunaroute-docs (default ~/.local/share/opencode/lunaroute-docs, override with LUNAROUTE_DOCS_DIR) — the model gets the path plus the document's opening lines. Private by default (dir 0700 / files 0600); an explicit override directory is respected as-is.
• Scanned PDFs: with ocr: false (default) a scanned PDF answers needs_ocr — rerun with ocr: true (the costly path is the model's call).
• Key rotation: the current key is re-read on every call. Disable: LUNAROUTE_CONVERT_TOOLS=off / {"convertTools": "off"} — same semantics as the other toggles.

Configuration

The gateway, API, and front URLs default to production and are overridable for dev/staging via environment variables before starting OpenCode:

Variable	Default	Purpose
LUNAROUTE_ROUTING_URL	https://gw.lunaroute.com/v1	Gateway base URL (provider baseURL + /models)
LUNAROUTE_API	responses	Wire format. Accepts responses or completions (case-insensitive; absent means responses). responses routes models through opencode's OpenAI Responses protocol (@ai-sdk/openai, gw/v1/responses); completions is the chat-completions kill switch (@ai-sdk/openai-compatible). An unrecognized value warns and falls back to completions.
LUNAROUTE_API_URL	https://api.lunaroute.com	API host for /v1/auth/exchange
LUNAROUTE_FRONT_URL	https://app.lunaroute.com	Web app host for /device-auth/opencode browser login
LUNAROUTE_MCP_URL	https://mcp.lunaroute.com/mcp	Hosted MCP server URL registered in the live config

Setting provider.lunaroute.options.baseURL in your OpenCode config takes precedence over LUNAROUTE_ROUTING_URL everywhere (chat, model catalog, key validation) — one effective URL for all of them.

Setting provider.lunaroute.npm in your OpenCode config pins the wire format opencode routes every LunaRoute model on (opencode derives each model's routing npm from the provider-level value, so an explicit pin wins over LUNAROUTE_API); unset, the environment variable decides, and absent that the Responses default applies.

Troubleshooting

• /connect doesn't list LunaRoute: run opencode models | grep -i lunaroute first — the LunaRoute provider (placeholder model Log in to load models before first login) must appear there too.
  • Missing from opencode models too → the plugin isn't loading (or is stale). OpenCode only reports load failures in the server log (~/.local/share/opencode/log/opencode.log — look for failed to load plugin; LunaRoute hook activity lands there as LunaRoute: lines). In order of likelihood:
    • Stale plugin cache (if you installed an older release before): OpenCode pins the plugin at ~/.cache/opencode/packages/@lunaroute/opencode-extension@latest (macOS: ~/Library/Caches/opencode/packages/@lunaroute/…) and never re-checks npm — a cached pre-0.1.2 copy keeps running forever, and releases before 0.1.2 don't keep LunaRoute listed in /connect. Clear it and restart OpenCode: rm -rf ~/.cache/opencode/packages/@lunaroute.
    • Wrong config file or entry form: the plugin entry must be in a config file OpenCode reads (global ~/.config/opencode/opencode.json or a project opencode.json) and spelled as the npm name "@lunaroute/opencode-extension" — a tarball/file: path entry does not load on OpenCode ≥ 1.18.30.
  • Listed in opencode models but not /connect → check enabled_providers / disabled_providers in your OpenCode config: OpenCode hides providers not in enabled_providers and those in disabled_providers — remove lunaroute from the latter or add it to the former.
  • Re-authenticating after a revoked key (shape-valid credential, gateway 401): /connect may not list LunaRoute — use the CLI instead: opencode providers login --provider lunaroute opens the same login-method picker.
• Placeholder says "Couldn't load models — check connection and restart": you're logged in, but the model catalog could not be fetched (network, or a custom baseURL/LUNAROUTE_ROUTING_URL pointing somewhere that doesn't answer /models). The provider stays listed so you can retry; fix the connection or URL and restart OpenCode.
• No models appear after login: the gateway may be unreachable, or the key may be stale. Re-run /connect.
• Key rotation: re-run /connect — the new key replaces the old one, and MCP picks it up on the next instance reload (no restart needed).
• Removing your credentials: delete the lunaroute entry from ~/.local/share/opencode/auth.json (OpenCode has no /disconnect command yet). The plugin stops injecting models and MCP on the next start; until then, an open session keeps using the old key — server-side revocation is what actually cuts access.
• Unreadable or corrupt auth.json: the plugin logs one secret-free warning and behaves as logged out (nothing is removed from your config). Re-running /connect rewrites the store and restores the session.
• web_search missing: it only registers when logged in and the hosted MCP server offers it (checked at session start). Log in via /connect, then reload or restart; if it's still missing, the server didn't offer it to your org. LUNAROUTE_WEB_TOOLS=off disables it on purpose.
• Settings file problems: a malformed lunaroute.json logs one warn and behaves as if the file were absent (defaults) — fix the JSON and reload; nothing else is affected.
• Generated image not visible to the model: it is saved locally and attached as a file — if the model still can't see it, the model in use may lack vision; check the model's capabilities in /models.
• Windows: not supported in v1 — the auth store path is verified on Linux and macOS only.

Development

npm install
npm run check   # typecheck + tests

Manual smoke test: see docs/smoke-checklist.md (run against staging before every release).

Package dry run:

npm pack --dry-run

Release

Publishing is tag-driven via .github/workflows/publish.yml, using npm Trusted Publishing (OIDC) — no NPM_TOKEN secret.

One-time setup (human, out of band): add a Trusted Publisher entry on npmjs.com for @lunaroute/opencode-extension pointing at

• org/user: lunaroute
• repo: lunaroute-opencode-extension
• workflow: publish.yml
• allowed: npm publish

Then, for every release:

1. The staging smoke checklist (docs/smoke-checklist.md) must be green.
2. Tag and push (e.g. git tag v0.1.0 && git push origin v0.1.0) — the tag push triggers the workflow, which runs npm run check as a gate and publishes with provenance. (If Trusted Publishing is not yet usable — the package must exist on npm first — the initial publish can be done locally with npm publish --provenance.)
3. Verify: the workflow is green and npm view @lunaroute/opencode-extension version shows the new version.

License

MIT License. See LICENSE.