Add iMessage

NanoClaw talks to iMessage through a single imessage channel with two pluggable backends:

• Local (this Mac) — the Chat SDK bridge over chat-adapter-imessage,

reading this Mac's signed-in iMessage account (chat.db). macOS only; the Node binary needs Full Disk Access.

• Hosted iMessage (via photon.codes) — a native adapter over Photon's

spectrum-ts gRPC stream. The hosted service owns the iMessage line, so there's no Mac relay, webhook, or public URL. Works on any OS, and a device-login flow provisions everything for you.

Both register the same imessage channel type; only one runs per install. NanoClaw doesn't ship channels in trunk — this skill copies the unified imessage adapter in from the channels branch. Full reference: docs/imessage.md.

The mechanical steps under Apply carry nc: directive fences: an agent reads the prose and applies them, and a parser can apply them deterministically from the same document. Every directive is idempotent, so the whole skill is safe to re-run; anything a parser can't apply falls back to the prose beside it.

Apply

1. Choose a backend

Pick the backend first — it decides which package gets installed and which walkthrough runs below (the other backend's steps are skipped):

nc:prompt backend validate:^(local|hosted)$
How should iMessage run — `local` (this Mac's signed-in iMessage account; macOS only, needs Full Disk Access) or `hosted` (a managed line via photon.codes; works on any OS)?

The local backend only works on a Mac — it reads this machine's iMessage chat.db directly, and there is no such database off macOS. On any other OS, stop here and choose hosted instead; otherwise you'd write a local config that can never receive a message:

nc:run effect:check when:backend=local
[ "$(uname)" = Darwin ]

2. Copy the adapter

Fetch the channels branch and copy the unified iMessage adapter and its tests into src/channels/:

nc:copy from-branch:channels
src/channels/imessage.ts
src/channels/imessage.test.ts
src/channels/imessage-registration.test.ts

3. Register the adapter

Append the self-registration import to the channel barrel (skipped if the line is already present). This one line is the skill's only reach-in into core:

nc:append to:src/channels/index.ts
import './imessage.js';

4. Install the chosen backend's package

Pinned to an exact version — the supply-chain policy rejects ranges and latest. Install only the chosen backend's package.

Local — the Chat SDK iMessage adapter:

nc:dep when:backend=local
chat-adapter-imessage@0.1.1

Hosted — Photon's Spectrum SDK:

nc:dep when:backend=hosted
spectrum-ts@11.0.0

> Pin exactly. spectrum-ts ships breaking majors (v11 is what the adapter > targets); don't @latest. NanoClaw's pnpm gate (minimumReleaseAge) requires > a version ≥3 days old — both pins clear it. A fresher pin needs human sign-off > before a minimumReleaseAgeExclude entry (CLAUDE.md → Supply Chain Security).

5. Build and validate

Build guards the typed createChatSdkBridge(...) core call used by the local backend, and the registration test proves the channel is wired:

nc:run effect:build
pnpm run build

nc:run effect:test
pnpm exec vitest run src/channels/imessage-registration.test.ts

Both must be clean. imessage-registration.test.ts imports the real channel barrel and asserts the registry contains imessage — it goes red if the import './imessage.js'; line is missing or the barrel fails to evaluate. The adapter loads neither backend's SDK at import (hosted spectrum-ts only in setup(), local chat-adapter-imessage only in the factory), so the test needs no package.

For the hosted backend, also run the full adapter suite — it includes an integration block that exercises the real installed spectrum-ts (version, exports, builders) and auto-skips when the package is absent:

nc:run effect:test when:backend=hosted
pnpm exec vitest run src/channels/imessage.test.ts

Local backend: Full Disk Access (macOS)

The adapter reads this Mac's chat.db, which requires Full Disk Access granted to the Node binary the host runs under. The Node path is buried deep (e.g. ~/.nvm/versions/node/v22.x.x/bin/node), so open its folder in Finder to make the drag-and-drop target obvious. Harmless off a desktop (SSH/headless) — it just no-ops:

nc:run effect:external when:backend=local
open "$(dirname "$(which node)")" 2>/dev/null || true

Then tell the user:

nc:operator when:backend=local
Grant Full Disk Access to Node so iMessage can read your chat history:
1. Open System Settings > Privacy & Security > Full Disk Access.
2. Click +, then drag the "node" file from the Finder window that just opened.
3. Toggle it on, then come back here.

Stop and wait for the user to confirm Full Disk Access is granted before continuing.

Now select the local backend in .env. The configure script owns this upsert-and-remove (a plain set-if-absent env write can neither replace a stale value nor delete a key, and a lingering hosted selector would shadow the choice):

nc:run effect:external when:backend=local
bash setup/channels/imessage-configure.sh local

Hosted backend: device login (via photon.codes)

The provisioning flow needs the phone number you send iMessages from — it registers that number with your project so the hosted line recognises you:

nc:prompt owner_handle normalize:trim validate:^\+\d{8,15}$ when:backend=hosted
The phone number you iMessage from, in E.164 format — + followed by country code and number, no spaces or dashes (e.g. +14155551234).

Tell the user what's about to happen:

nc:operator when:backend=hosted
Connect your hosted iMessage line (photon.codes):
1. A login URL and a short code will print below.
2. Open the URL in a browser, approve the device, and enter the code.
3. Setup then asks for one dashboard step: add your number as a user in the Photon dashboard and accept the invite that arrives on your phone. Numbers only receive messages after that invite.
4. Once the opt-in lands, setup finishes on its own and prints your agent's iMessage number.

Run the device-login flow. It provisions the project, reuses its current secret (regenerating only when the API returns none), walks you through the dashboard Add-user + invite step (waiting until your number is opted in), and surfaces the iMessage number you'll text — writing PHOTON_PROJECT_ID + PHOTON_PROJECT_SECRET to .env and the assigned number to data/photon-auth.json:

nc:run effect:step when:backend=hosted
pnpm exec tsx scripts/photon-setup.ts setup --phone {{owner_handle}} --embedded

If the login times out, the code expired (~30 min) — re-run the step; a stored token is reused. Check state any time with pnpm exec tsx scripts/photon-setup.ts status.

Then select the hosted backend in .env — the Photon credentials already imply hosted, but the explicit selector avoids ambiguity if local keys linger:

nc:run effect:external when:backend=hosted
bash setup/channels/imessage-configure.sh hosted

Restart

Restart the service so it loads the iMessage adapter and the backend config you just wrote, and wait for its CLI socket before wiring:

nc:run effect:restart
bash setup/lib/restart.sh

For the hosted backend, confirm the connection came up: grep "Photon channel connected" logs/nanoclaw.log | tail -1.

Resolve your iMessage handle

The agent greets you in the iMessage conversation tied to the handle you message from — that handle is both your identity and the conversation address. The hosted flow already collected it above; for the local backend, resolve it now (email works too — whatever iMessage recognises):

nc:prompt owner_handle validate:^(\+\d{8,15}|[^\s@]+@[^\s@]+\.[^\s@]+)$ when:backend=local
The phone number or email you iMessage from — a +E.164 number (e.g. +14155551234) or an email / Apple ID (e.g. you@icloud.com).

Hosted first contact: text your agent's iMessage number once (it was printed above; also stored in data/photon-auth.json) before expecting any message from it. This first text is required, not just convenient — the hosted line can only message numbers that have already texted it (cold outbound is rejected with Target not allowed for this project). Tell the user:

nc:operator when:backend=hosted
Send one text — anything — from your phone to your agent's iMessage number (printed above). The hosted line can only reply to numbers that have texted it first, so its welcome message needs yours to arrive first.

iMessage is a native channel: it sends the raw handle as the conversation address, with no channel prefix — so the messaging-group platform id is that handle as-is:

nc:run capture:platform_id
echo "{{owner_handle}}"

owner_handle and platform_id are what the owner-wiring step needs. The welcome iMessage goes out through the adapter once the service is running — on the local backend that needs Full Disk Access granted (above); on the hosted backend it goes out via your photon.codes line after your first text.

Next Steps

If you're in the middle of /setup, return to the setup flow now. Otherwise /init-first-agent stands up an agent on your iMessage DM, or /manage-channels wires it to an existing agent group.

Channel Info

• type: imessage (one channel; the backend is local or hosted)
• terminology: iMessage has 1:1 "chats" (DMs) and group chats. Photon

(hosted) calls each conversation a "space".

• platform-id-format: DM = your bare handle (E.164 phone, or email for

local) — direct-addressable; the user id is imessage:<handle>. Group (hosted) = the opaque Spectrum space id.

• how-to-find-id: DMs use the counterpart's phone/email. Groups (hosted) are

discovered on first message — pnpm exec tsx scripts/q.ts data/v2.db "SELECT platform_id, name FROM messaging_groups WHERE channel_type='imessage'"

• supports-threads: no
• typical-use: Interactive 1:1 chat — personal messaging
• default-isolation: One agent per install. Multiple DMs with the same

operator can share an agent group; groups with other people should typically use isolated session mode.

Hosted features

Markdown (native; PHOTON_MARKDOWN=false for plain text), file attachments in and out (inbound staged into the session inbox, capped by PHOTON_MAX_INLINE_ATTACHMENT_BYTES, default 20 MB), tapback reactions, read receipts, typing indicators, and ask_user_question via /approve / /reject slash replies. Optional .env: PHOTON_MARKDOWN, PHOTON_TELEMETRY, PHOTON_MAX_INLINE_ATTACHMENT_BYTES, PHOTON_DASHBOARD_HOST, PHOTON_SPECTRUM_HOST. Full table in docs/imessage.md.

Troubleshooting

The backend answer is rejected. It must be exactly local or hosted, lowercase. Local only exists on macOS — it reads this Mac's chat.db directly — so on any other OS the platform check stops you and hosted is the only path.

Local: outgoing works but nothing ever arrives. Full Disk Access wasn't granted to the actual Node binary the service runs under — with nvm the path changes per Node version (~/.nvm/versions/node/v22.x.x/bin/node), so an old grant silently stops covering a new binary. Re-open System Settings → Privacy & Security → Full Disk Access, add the binary at $(which node), then restart the service.

spectrum-ts not installed (hosted) — re-run step 4 (pnpm install spectrum-ts@11.0.0) and restart.

Device login times out (hosted) — the code expires in ~30 min; re-run the login step (a stored token is reused).

Target not allowed for this project (hosted) — intended: the line only messages numbers that have texted it first. Text the agent's number once, then retry (a welcome DM queued before that first text simply fails delivery).

Your handle is rejected at the resolve step. It must be a bare +E.164 number (+14155551234 — no spaces, dashes, or parentheses) or, on the local backend, an email/Apple ID. Use the exact handle you actually send iMessages from — a number-vs-email mismatch means your messages never map to the wired conversation.

Adapter installed but silent. Run pnpm exec vitest run src/channels/imessage-registration.test.ts — red means the barrel import or the package install drifted, so re-run the Apply steps. If green, confirm the backend connected (hosted: grep "Photon channel connected" logs/nanoclaw.log), restart the service (bash setup/lib/restart.sh), then check logs/nanoclaw.error.log.

More in docs/imessage.md.

Upgrading spectrum-ts (hosted)

spectrum-ts is pinned exactly because it ships breaking majors. To upgrade, read the release notes for every version between the pins, bump the pin, reconcile src/channels/imessage.ts against the new typings, then pnpm run build and pnpm exec vitest run src/channels/imessage.test.ts. See docs/imessage.md.