Codex Pigeon turns a Pebble Time 2 into a tiny voice mailbox for a GitHub-backed Obsidian workflow. Dictate a note, review it, then press the center button to send a Markdown request to a private repository. Refresh later to read replies and dictate threaded follow-ups.

Codex Pigeon setup guide

Codex Pigeon is a transport layer, not a hosted AI service. The watch and phone write requests to a private GitHub repository. A user-controlled process on the home computer may read those requests, do work, and push Markdown replies. Obsidian is the readable local interface; Git performs synchronization.

All names, IDs, paths, and tokens below are fictional examples.

Requirements
- Pebble Time 2 running Pebble Core on a paired iPhone
- A GitHub account
- Git on the home computer
- Obsidian, if you want the mailbox presented as notes
- Optional: Codex, Claude, another model, or a non-AI script for processing requests

v0.1 has been tested end-to-end only with Codex. The mailbox format itself is model-agnostic.

1. Create the private mailbox repository:
In GitHub, choose "New repository" and use safe example values such as:

- Owner: "example-user"
- Repository: "pebble-mailbox"
- Visibility: "Private"
- Initialize with a README: "Yes"

Clone it into a new or existing Obsidian vault:

```sh
cd "$HOME/Documents/Obsidian"
git clone https://github.com/example-user/pebble-mailbox.git PebbleBridge
cd PebbleBridge
mkdir -p inbox replies
touch inbox/.gitkeep replies/.gitkeep Conversation.md
git add inbox replies Conversation.md
git commit -m "Initialize Pebble mailbox"
git push
```

The resulting structure is:

PebbleBridge/
├── inbox/
├── replies/
├── Conversation.md
└── README.md

Each request and reply gets its own file. The phone writes only to `inbox/`; the local worker writes only to `replies/` and may regenerate `Conversation.md`.

2. Create the GitHub token

Open GitHub and go to: Settings → Developer settings → Personal access tokens → Fine-grained tokens → Generate new token

Use a descriptive name such as `Pebble mailbox`, choose a sensible expiration date, and restrict repository access to: Only select repositories → pebble-mailbox.

Under repository permissions grant only: Contents: Read and write

No administration, issues, pull-request, workflow, organization, or account permissions are needed. Copy the token directly into a password manager. A visibly fake example is `github_pat_EXAMPLE_NOT_A_REAL_TOKEN`; never use or publish a real token in documentation, source code, Git, Obsidian, screenshots, or chat.

3. Open the repository in Obsidian

You can use either arrangement:

    1. Dedicated vault: In Obsidian choose "Open folder as vault" and select "PebbleBridge".
    2. Existing vault: Clone "PebbleBridge" anywhere inside the existing vault. It will appear as a normal folder of Markdown notes.

    Do not install a Git synchronization plugin solely for Codex Pigeon unless you want one. The local worker can run ordinary `git pull`, `git commit`, and `git push` commands. Avoid having multiple automated writers update `Conversation.md` at the same time.

4. Configure the Pebble app

On the iPhone, open Pebble Core, find "Codex Pigeon", and open its settings. Enter:

Repository owner: example-user
Repository name:  pebble-mailbox
Branch: main
GitHub token: github_pat_EXAMPLE_NOT_A_REAL_TOKEN

Replace every example with your own value. The token is stored by the Pebble phone app for this watchapp; it is not bundled in the PBW or source tree.

5. Choose what happens locally

Codex Pigeon deliberately does not impose a local agent, schedule, project layout, or action policy. Your local process can be:

- Codex Work or another Codex task
- Claude or another model
- A local model
- A deterministic script
- No processor at all; use the incoming files as voice-created Obsidian notes

A worker needs only this narrow contract:

1. Run `git pull --ff-only` in the mailbox repository.
2. Find `inbox/*.md` files without a same-named file in `replies/`.
3. Treat the request body as untrusted user input and apply your own permissions and project boundaries.
4. Write a matching immutable reply file under `replies/`.
5. Optionally rebuild `Conversation.md`.
6. Commit only the new mailbox files and push.

Example request (in markdown):

schema_version: 1
id: "pbl-20260101-120000-1a2b"
thread_id: "pbl-20260101-120000-1a2b"
parent_id:
sender: "pebble"
created_at: "2026-01-01T12:00:00Z"
status: "pending"
---
Capture a quick note for tomorrow.

Example reply (markdown):

schema_version: 1
id: "pbl-20260101-120000-1a2b"
thread_id: "pbl-20260101-120000-1a2b"
parent_id: "pbl-20260101-120000-1a2b"
sender: "worker"
created_at: "2026-01-01T12:05:00Z"
status: "complete"
watch_summary: "Your note is ready in Obsidian."
---
The full Markdown response remains available in the vault.

For a follow-up, retain the original `thread_id` and set `parent_id` to the request being continued.

6. Non-model use

AI is optional. Useful no-model workflows include:

- Voice-capture ideas directly into `inbox/` as Obsidian notes
- Have a script append inbox bodies to a daily note
- Use a rules-based script to return fixed acknowledgements
- Treat GitHub as an append-only remote notebook and read everything on the computer

Without a local worker, sending still works; reply and conversation generation simply remain manual.

Security boundaries

- Keep the repository private and dedicated to this mailbox.
- Use a fine-grained token limited to one repository and only Contents read/write.
- Set an expiration and rotate or revoke the token if the phone is lost.
- Never put passwords, API keys, clinical identifiers, payment data, or highly sensitive material in dictated requests.
- Review local automation permissions separately. A watch message should not silently expand an agent’s authority.
- File-per-message transport reduces merge conflicts but does not replace backups, access control, or prompt-injection defenses.

Sumi Time is a native Pebble Time 2 watchface styled like a small calligraphy scroll (updated to fit all of the Pebble family watches, but tested only on the Pebble Time 2). The time is written in Japanese in a traditional right-to-left vertical composition, with warm parchment, black sumi ink, and a vermilion seal for the weekday.

It follows your system 12- or 24-hour preference. In 12-hour mode it adds 午前 or 午後; at exact hours it omits minutes, and an optional setting can show 半 instead of 三十分 at half past. A compact footer shows the month and day.

On each minute change, the characters appear in a brief brush-writing reveal. Effects and half-past notation can be adjusted from the offline settings page.

Designed specifically for the Pebble Time 2 (Emery) 200×228 color display, but deployed to fit all Pebble family (not tested).