cli-bridge

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name: cli-bridge version: 0.3.0 description: | Manage short-code bundles that authorize the local starchild CLI to talk to this agent, including the agent-shell local-exec channel.

Use when connecting or disconnecting the starchild CLI (e.g. mint a CLI bridge code, list my CLI bundles, revoke an old CLI session, or let the agent run shell commands on the user's own machine). delivery: script metadata: starchild: emoji: "🔗" skillKey: cli-bridge requires: bins: [python3] user-invocable: false author: starchild tags: [cli, akm, bridge, sc-chatroom, short-code]

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cli-bridge — issue CLI bundles for the user's own starchild binary

This skill mints a fresh AKM key (scope=chat:bridge:cli) on the local clawd, then registers it with sc-chatroom in exchange for a short opaque code (sc_xxxxxxxx). The bundle handed to the user contains only that short code — never the AKM secret, never the Fly machine id.

+----------------+   POST /agent/chat/stream   +-----------------+
| starchild CLI  |   Bearer sc_xxxxxxxx        | sc-chatroom     |
| (user laptop)  | --------------------------> | (gateway)       |
+----------------+                             +--------+--------+
                                                        |
                            resolves sc_… → AKM + container_id
                                                        |
                                                        v
                                          POST /chat/stream (Bearer sk_…
                                          + fly-force-instance-id)
                                          +----------------------+
                                          | user's own clawd     |
                                          | (Fly internal)       |
                                          +----------------------+

Why a short code instead of the raw AKM?

Earlier versions baked the AKM secret + Fly machine id into the bundle directly. That worked but had two downsides — the bundle leaked routing metadata when decoded, and any party that ever held the bundle held a permanent AKM secret. The short-code form fixes both:

• Bundle base64 decodes to {d, c:"", k:"sc_…", s, exp, l} — no secret, no Fly machine id.
• cli-revoke <sc_…> kills just the short code; the underlying AKM stays alive (use cli-revoke --akm <prefix> to nuke that too).
• sc-chatroom now holds the AKM secret in its DB. That's a deliberate trust shift — the AKM stays inside Fly's internal network instead of riding around on user laptops.

Scope boundary — read this first

cli-bridge covers exactly one path: the user's local CLI talking 1:1 to that user's own clawd. It is not a chatroom membership credential.

Use case	Right credential	Wrong
Personal CLI ↔ own clawd (this skill)	chat:bridge:cli AKM, fronted by sc_… code	—
Join an sc-chatroom room	chat:thread:chatroom-{room_id} AKM via chatroom join	chat:bridge:cli AKM
Browse a public room as a guest	no credential needed	any AKM

Prerequisites

Same as chatroom:

• AKM is installed in this clawd (POST /api/keys works on loopback)
• AKM accepts scope="chat:bridge:cli" and the /chat/stream middleware allows arbitrary thread_id for that scope (already shipped in clawd branch aladdin/feat/akm-chatroom)
• sc-chatroom is on a build that includes POST /cli-keys (migration 007+)
• FLY_MACHINE_ID (or CONTAINER_ID) env is set
• CHATROOM_PUBLIC_URL env points at the sc-chatroom gateway (defaults to https://workroom.iamstarchild.com)
• CHATROOM_SERVER_URL env points at the Fly-internal sc-chatroom (defaults to http://sc-chatroom.internal:8080)

Commands

cli-login — mint a new bundle

python3 skills/cli-bridge/scripts/cli_login.py --label "my laptop"
python3 skills/cli-bridge/scripts/cli_login.py --label "codex-vm" --ttl-days 14

Default TTL is 90 days; max is 365 days. Output is a one-liner the user copies into starchild login. The bundle is opaque — sc-chatroom resolves it on each call.

cli-list — show active bundles

python3 skills/cli-bridge/scripts/cli_list.py
python3 skills/cli-bridge/scripts/cli_list.py --include-revoked

Lists every CLI short code minted by this user on sc-chatroom. Columns: code, issued, expires, uses, label.

cli-revoke — kill a bundle

python3 skills/cli-bridge/scripts/cli_revoke.py sc_xxxxxxxx
python3 skills/cli-bridge/scripts/cli_revoke.py --akm sk_yyyyyy

Default: kills the short code in sc-chatroom; underlying AKM stays alive. With --akm: also revokes the AKM on local clawd, taking out every bundle backed by it.

Local shell via agent-shell (CLI ≥ v0.2.0)

A cli-login bundle minted with --enable-shell also authorizes the agent to run shell commands on the user's own machine — for "is nginx running on my laptop", "organize ~/Downloads", and the like. A plain bundle is a chat bridge only and grants no shell access (see "Shell is off by default" below). The user starts a small daemon:

starchild agent-shell            # daemonizes; holds a WS open to your clawd
starchild agent-shell --foreground   # attach to the terminal for debugging
starchild agent-shell-stop       # stop the daemon

agent-shell refuses to start if the logged-in bundle wasn't granted shell — it tells the user to get a --enable-shell bundle rather than connecting a channel clawd would reject.

The daemon is single-instance (pidfile + flock) and macOS/Linux only. It self-updates at startup and periodically; downloaded binaries are verified against an embedded Ed25519 release key before swapping, so a hostile or MITM'd update server can't push arbitrary code to the user's machine.

How it works: the daemon dials wss://<chatroom>/ws/cli-shell with the bundle's sc_… code. sc-chatroom resolves the code and reverse-proxies the WebSocket to the user's clawd machine — it accepts the laptop's upgrade, opens its own upstream WS to clawd pinned with fly-force-instance-id, and pumps bytes between the two (this is not fly-replay: chatroom and clawd are different Fly apps, and cross-app replay is rejected with 403). The AKM is injected server-side on the upstream hop — it never reaches the laptop. clawd holds the connection in its ShellHubService; the local_shell tool is then exposed to the LLM only while a shell-capable laptop is connected, and pushes commands down the socket.

Shell is off by default (capability gate)

cli-login does not grant shell unless --enable-shell is passed. The AKM is the authoritative capability source: clawd reads it on the /ws/cli-shell handshake and refuses every exec for a connection that doesn't carry shell (#264). So a leaked plain bundle is a chat credential, never local RCE.

• Grant shell: cli_login.py --label … --enable-shell → AKM capabilities: ["shell"], bundle carries x: ["shell"].
• Upgrade an existing no-shell bundle: you can't flip it in place — mint a new --enable-shell bundle, starchild login it, and cli-revoke the old one. Privilege escalation always goes through a fresh issuance.

What the agent knows up front (capability manifest)

On connect, the daemon sends a hello frame advertising:

• Platform — os (darwin/linux), arch (arm64/amd64), and the active shell. So the agent knows whether it's talking to BSD or GNU userland, which package manager to assume, etc. — no more guessing ps flags or hitting ps: illegal option.
• Policy summary — mode (default-deny when no allow rules exist, else allowlist), the user's allowed rules, explicit denied_extra rules, and the always-on builtin_denied list.

clawd renders this into the agent's system prompt (only while connected), so the agent picks a permitted command — or tells the user plainly that the local policy forbids it — instead of probing blindly.

Session behavior

• Connection-level cwd. Each command's resulting working directory is echoed back (via a trailing-pwd sentinel stripped from stdout) and persisted for the next command, so cd has real meaning across calls within a session — without the cost/fragility of a full PTY. An explicit per-call cwd overrides it.
• Output truncation. stdout/stderr are each capped at 200 lines (plus a byte cap) so a find / or log dump can't flood the LLM context. The full pre-truncation line count is reported (stdout_lines / stderr_lines), and truncated: true is set — the agent can say "showing first 200 of N lines" rather than truncating silently.
• Heartbeat. The daemon pings every 45s to keep the idle WebSocket alive (Fly's edge cuts idle sockets at ~2.5min). Exec runs in a goroutine so a long command doesn't block heartbeats.

Local execution policy (the only auto-run guard)

The daemon runs headless (no TTY to prompt on), so every command is gated by ~/.config/starchild/exec-policy.toml (parsed as a tiny YAML allow:/deny: line format — no TOML dependency, despite the name). Rules are substring matches by default; wrap a rule in / / for a regex:

allow:
  - "ls"
  - "cat "
  - "/^git (status|log|diff)/"
  - "ps"
deny:
  - "git push"

Decision order: built-in deny (always wins) → file deny → file allow → default-deny. Two hard rules apply regardless of the file:

• A built-in deny list of interactive/TTY-blocking and destructive commands is always refused: vim/vi/nano/emacs, less/more/man, top/htop/btop, ssh/telnet, sudo/su/ doas, tmux/screen, reboot/shutdown/halt, plus the shapes rm -rf, mkfs, dd if=, … | sh, … | bash, > /dev/sd*.
• Default-deny: anything not matched by an allow rule is denied. So with no policy file the policy mode is default-deny and nothing runs until the user opts commands in.

Limitations

• Unattended policy only. There is no interactive approval prompt; the policy file is the sole guard. A future version adds a web-approval popup.
• Synchronous commands only. No background jobs / progress polling yet.
• macOS/Linux only. The daemon refuses to run on Windows.
• Revocation: cli-revoke <sc_…> kills the short code; the daemon's next reconnect then fails auth and the channel closes.

File transfer via agent-shell (CLI ≥ v0.3.0)

When the bundle is minted with --enable-files, the same agent-shell daemon also serves file transfer between the user's machine and the agent's workspace. Content streams disk→disk and never passes through the chat, so large/binary files (10MB+ PDFs, images, archives) work.

Three agent-facing tools + one user command:

• request_upload(laptop_path) — agent pulls a file FROM the laptop into workspace/uploads/ ("take my ~/big.pdf and summarize it").
• write_local_file(src, dst) — agent sends a workspace file TO the laptop ("save workspace/output/report.pdf to my ~/Downloads"). src is a workspace path, not inline content.
• read_local_file(path) — read a small text file for the agent to see (config/log snippet). Large/binary files go through request_upload.
• starchild push <file> — user proactively uploads a local file into the agent's workspace/uploads/; it's announced to the agent in its prompt.

python3 skills/cli-bridge/scripts/cli_login.py --label "laptop" --enable-files
# combine with shell if you want both:
python3 skills/cli-bridge/scripts/cli_login.py --label "laptop" --enable-shell --enable-files

files is an independent capability from shell — a bundle can have either, both, or neither. Like shell, it's off by default and authoritative on the AKM (clawd refuses transfer frames for a connection without it).

File path policy (laptop-side, layered)

Transfers are gated on the laptop by a path policy, strictest-first:

1. Built-in protected paths are ALWAYS refused (even under --yolo): ~/.ssh, ~/.aws, shell rc (.zshrc/.bashrc/…), .config/starchild, launchd/systemd/cron, .git/hooks, browser cookie stores, .env, ssh keys. Writing those would be persistent RCE; reading them leaks creds.

2. Dedicated transfer dir (~/starchild-transfer, auto-created) — always allowed for read + write. The safe default workspace; prefer it.

3. Outside that dir — denied unless the path matches a read_allow / write_allow glob in ~/.config/starchild/file-policy.toml, or the daemon was started with --yolo:

   starchild agent-shell --yolo   # allow ANY path (built-in deny still applies)
   

   # ~/.config/starchild/file-policy.toml  (YAML allow-globs)
   read_allow:
     - "~/Documents/*.md"
   write_allow:
     - "~/exports/*.csv"
   

Other guarantees: written files get mode 0644 (never executable); writes are atomic (temp file + rename, no half-written target); symlinks that escape the transfer dir are refused; per-transfer cap is 100 MiB, streamed in chunks so large files don't blow the WS frame limit.

Security note: a running agent-shell (on a --enable-shell bundle) plus a permissive policy is effectively remote command execution on the user's machine, bounded by the AKM TTL, the sc_… code's validity, and the policy file. Defaults are conservative: shell is off unless explicitly granted, the policy is deny-all until commands are opted in, and the daemon's self-update verifies an Ed25519 signature before swapping binaries. Widen deliberately.

End-to-end smoke test

# 1. Inside agent chat:
@agent give me a cli key for my laptop
# → outputs `starchild login starchild_<base64>` (bundle has sc_… code)

# 2. On laptop:
starchild login starchild_xxx
starchild whoami
starchild "hello, who are you?"
# → starchild sends Bearer sc_… to sc-chatroom; sc-chatroom resolves
# → it to AKM + container_id and forwards to user's clawd

# 3. Revoke the short code from chat:
@agent revoke cli code sc_xxxxxxxx

# 4. Next CLI call should fail at the gateway:
starchild "hello?"
# → "gateway rejected (401) — code may be revoked; ask your agent for a fresh CLI bundle"

Pipe / shell composition (CLI ≥ v0.1.0)

Once paired, starchild is pipe-friendly. It reads stdin when no positional prompt is given, writes the assistant reply to stdout, and sends diagnostics to stderr — so it composes with any Unix tool.

# stdin → reply
echo "explain monads in 3 lines" | starchild

# reply → downstream
starchild "what is the OWASP top 10?" | pbcopy

# full three-stage pipe with streaming output
( echo "summarize this README:"; cat README.md ) | starchild --stream | tee summary.md

# code review pattern — concatenate context + question upstream
( echo "review this diff, flag risky changes:"; git diff ) | starchild

Gotcha: when you pass a positional prompt, stdin is ignored. To send both context and an instruction, concatenate them upstream with ( echo "<question>"; cat <file> ) rather than relying on cat <file> | starchild "<question>" (which would silently drop the file contents).

SOUL.md hint (recommended)

Add to your agent's SOUL.md so the LLM picks the right tool when the user asks for a CLI key:

## Issuing CLI bundles for the user's own bots/scripts

When the user asks "give me a cli key" / "create a starchild bundle" /
"let me talk to you from my terminal", run:

  python3 skills/cli-bridge/scripts/cli_login.py --label "<inferred>"

This is a chat bridge only — it does NOT let you run commands on their
machine or touch their files. Two independent opt-in capabilities, each
granting local access — only add them when the user explicitly asks:

- `--enable-shell` → run commands ("run commands on my laptop", "use
  agent-shell", "organize my Downloads"). Remote command execution.
- `--enable-files` → read/write files ("save this to my laptop", "read my
  ~/notes.md"). Reads/writes files on their machine.

  python3 skills/cli-bridge/scripts/cli_login.py --label "<inferred>" --enable-shell
  python3 skills/cli-bridge/scripts/cli_login.py --label "<inferred>" --enable-files

Treat both as granting access to their machine — never add either by
default or "to be helpful". If they later want a capability, mint a new
bundle with the flag and have them revoke the old one.

Default the label to something like "untitled-YYYY-MM-DD" if the user
doesn't suggest one. Show them the resulting bundle and tell them how
to revoke: `cli-list` to find the code, then `cli-revoke sc_…`.

After pairing, mention they can also pipe into the CLI from their
shell — e.g. `echo "..." | starchild`, `starchild "..." | pbcopy`,
or `( echo "review:"; git diff ) | starchild`. Stdout is the reply
(pipe-safe), stderr is diagnostics. Note the gotcha: passing a
positional prompt makes stdin get ignored, so context + question
should be concatenated upstream.