muxplex-client

Typed sync/async HTTP client for the muxplex tmux-session-dashboard API.

Ships as its own PyPI distribution (import name muxplex_client) so a consumer that only needs to make ~12 HTTP calls -- a Stream Deck sidecar, an Amplifier tool module -- never has to install the server's dependencies (fastapi, uvicorn, python-pam, ...) or its muxplex server console script. See ../muxplex-client-design.md for the full design rationale.

Install

pip install muxplex-client

Runtime dependency: httpx>=0.27.0. Nothing else -- no muxplex server dependency, no console script installed.

Usage

Synchronous:

from muxplex_client import MuxplexClient

with MuxplexClient("https://your-server:8088", "federation-key") as client:
    for session in client.sessions():
        if session.bell.needs_attention:
            print(f"{session.name} needs attention")

Asynchronous (Amplifier tool modules, or any asyncio caller):

from muxplex_client import AsyncMuxplexClient

async with AsyncMuxplexClient("https://your-server:8088", "federation-key") as client:
    result = await client.run_shell_command("my-session", "pytest -q")
    print(result.exit_code, result.elapsed)

A localhost caller needs no credential -- federation_key=None is the default and is fine when running on the same host as the server.

What's in here vs. what isn't

See muxplex-client-design.md §3 for the full included/excluded endpoint table and rationale. Notably excluded: PATCH /api/settings (highest blast-radius operation in the API; a v2 concern requiring CAS + 409 retry + backstop discrimination), all federation endpoints (server-to-server protocol, no client consumer), and /api/internal/setup-hooks (internal, self-healing as of server v0.18.0).

Version alignment

muxplex_client.__version__ is cut in lockstep with the muxplex server version -- one vX.Y.Z tag publishes both wheels. This is provenance ("cut against server X"), not a runtime requirement: the client declares no dependency on the muxplex package and enforces no version at runtime. MIN_SERVER_VERSION backs an opt-in check_server() helper the caller may call; it is never invoked automatically.

The load-bearing correctness mechanism is muxplex/tests/test_client_contract.py, living in the server's own test suite: it drives this client over httpx.ASGITransport against the real FastAPI app and asserts every field the client parses actually exists on the real response, that mirrored constants (KNOWN_KEYS, MAX_CAPTURE_LINES, DEFAULT_CAPTURE_LINES) equal their server originals, and that Bell.needs_attention agrees with the server's own predicate across a truth table.

The shell-command sentinel

run_shell_command() (and the lower-level muxplex_client.sentinel module) implements the completion-detection convention from AGENT_GUIDE.md §6.2/§6.4: wrap a command with ; rc=$?; ... ; echo "MUXPLEX_DONE_<token>_EXIT_$rc" and poll the pane for the marker.

This assumes the target pane is an idle POSIX shell prompt. It is not a general HTTP contract -- it fails (types a garbage line into whatever is actually running, then hangs until timeout) against vim, a REPL, less, a TUI, an ssh session, or a non-POSIX shell without a matching exit_expr.

The one correctness rule worth calling out explicitly: matching must be digit-anchored (MUXPLEX_DONE_<token>_EXIT_(\d+)), never a bare-token substring check. tmux echoes the literal, unexpanded ...EXIT_$? into the pane the instant you send the line -- before the shell has even run it -- so a bare-token match reports "done" with a bogus exit code immediately. See muxplex_client/sentinel.py's docstring and tests/test_sentinel.py's digit-anchor regression test.

Development

uv sync --extra dev   # from this directory, or from the repo root via the
                       # [tool.uv.workspace] declaration
uv run pytest

tests/ is pure -- no network, no server import, and passes with muxplex not installed at all.

Project links

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  • Released:
Newer release available (0.58.2)

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Credits

Author: Brian Krabach

GitHub Statistics

Data verified by PyPI on Aug 18, 2026
The GitHub source repository was provided by the project maintainers and verified by PyPI at the time of upload. Stars, forks, and open issues/PRs are derived from that repository and have not been independently verified.

License

MIT License (MIT)

Requires

Python >=3.11

Provides Extra

dev

Tags

api client http muxplex tmux

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