plyngent

Single-user LLM chat and agent toolkit for the terminal.

Python 3.14+. OpenAI-compatible APIs (including DeepSeek OpenAI-compat), OpenAI Responses with optional hosted tools, SQLite session memory, workspace-scoped file/process/VCS tools, and a readline REPL with slash commands.

Requires Python 3.14+ on your PATH (or via uv / pipx).

Install

Quick try (uvx)

No permanent install — runs the published package in a temporary environment:

uvx plyngent --help
uvx plyngent chat

User tool install

Keep plyngent on your PATH as a managed tool:

# uv (recommended)
uv tool install plyngent
plyngent --help

# pipx
pipx install plyngent
plyngent --help

Upgrade later:

uv tool upgrade plyngent
# or: pipx upgrade plyngent

pip (venv or user)

python3.14 -m venv .venv
source .venv/bin/activate   # Windows: .venv\Scripts\activate
pip install -U pip
pip install plyngent
plyngent --help

Or user install (if you accept that layout):

pip install --user plyngent

From a git clone (development)

pdm install          # first time
pdm sync             # after pull
pdm run plyngent --help

Dev checks (same order as CI):

pdm run ruff check .
pdm run ruff format --check .   # or: pdm run ruff format .  to apply
pdm run basedpyright .
pdm run pytest

Commit gateway (prek): runs ruff check + format and basedpyright on git commit so format is not forgotten.

uv tool install prek    # once
prek install            # once per clone (installs .git/hooks/pre-commit)
prek run --all-files    # run all hooks on demand

Config: prek.toml. CI still runs the same checks in GitHub Actions.

Basic usage

# 1) Create / open config
plyngent config path
plyngent config edit    # $VISUAL/$EDITOR, else system open (xdg-open/open/startfile)

# Minimal provider (OpenAI platform — Responses API; preset defaults to openai):
# [providers.oai]
# access_key_or_token = "sk-..."
# # models default: gpt-5.4, gpt-5.4-mini, gpt-5.4-nano
# # provider_tools default: web_search  (use provider_tools = [] to disable)

# 2) Chat
plyngent chat
plyngent chat --provider oai --model gpt-5.4-mini
plyngent chat -p "Summarize this repo" --provider oai --model gpt-5.4-mini --no-stream

# 3) List providers from config
plyngent providers

# 4) Plugins (entry-point allowlist under [plugins])
plyngent plugins list
plyngent plugins enable acme

In the REPL: type normally, use /help for slash commands, """ … """ for multiline, /markdown for Rich rendering, /quit to leave.

Configure

Default config path (platformdirs):

plyngent config path
plyngent config edit    # $VISUAL/$EDITOR (e.g. codium --wait), else system default

Copy the example and fill in a real token:

cp doc/plyngent.example.toml "$(plyngent config path)"
# then edit providers

Minimal shape:

[providers.local]
preset = "openai-compatible"
url = "https://api.openai.com/v1"
access_key_or_token = "sk-..."
# Optional HTTP timeouts (seconds). Default: connect=10, read=600.
# timeout = 120
# timeout = { connect = 10, read = 600 }

[providers.local.models]
"gpt-4o-mini" = { text = true }

[agent]
# system_prompt = persona (omit → built-in). tool_directives = tool playbook.
# system_prompt = "" / tool_directives = "" disable each part; both "" → no system.
# Or multi-line override (prefer '''...'''):
# system_prompt = '''Your custom persona...'''
# tool_directives = '''### Workspace ...'''
confirm_destructive = true
max_context_tokens = 200000
# Fold MCP server initialize ``instructions`` (usage guidance) into the
# system prompt when tools are on (default true; false ignores server text).
# mcp_instructions = true
# Static out-of-workspace pre-allow (path → read|write|exec); never prompts.
# allow_paths = { "/data/datasets" = "read", "/tmp/build" = "exec" }
# Auto-raise tool/PTY limits without prompting (same as answering yyy).
# auto_continue_limits = false

# Optional plugins (entry-point names); default load none. See doc/plugins.md.
# [plugins]
# enable = ["acme"]

Per-provider timeout is passed to the HTTP session for chat/completions, Responses, and GET /models. A single number sets one timeout; { connect, read } splits TCP/TLS setup vs idle wait between response bytes (SSE can run longer than read while chunks keep arriving). Tool/process timeouts (run_argv, PTY, policy confirm) are separate.

Third-party plugins: install a package that declares project.entry-points."plyngent.tools" (and later other groups), then allowlist the entry-point name under [plugins].enable. Details: doc/plugins.md.

MCP servers (Model Context Protocol over stdio): define servers under [mcp.servers.<name>] (command + args, optional env/cwd/timeout/read_only) and their tools become agent tools namespaced mcp__<server>__<tool> (LOCAL tags; read_only = true also marks them READ_ONLY, eligible for /btw --tools=read). Names in [mcp].disable stay disconnected. A server may also return optional instructions (usage guidance) in its MCP initialize response; when tools are on those are folded into the agent system prompt as MCP server <name> instructions: blocks ([agent] mcp_instructions = false disables), and /mcp previews them. In the REPL, /mcp lists per-server status and tool counts; /mcp reconnect re-reads the config file and restarts every enabled server (adopts newly added ones).

Supported provider presets today:

Preset	API used by the agent	Notes
openai (default if preset omitted)	OpenAI Responses (POST /responses)	Default models gpt-5.4 / gpt-5.4-mini / gpt-5.4-nano when models is omitted; optional provider_tools (default web_search)
openai-compatible	Chat Completions	Generic hosts (vLLM, LiteLLM, proxies); requires url
deepseek	Chat Completions (DeepSeek)	Default models deepseek-v4-flash / deepseek-v4-pro when models is omitted; set convention = "responses" (provider or per-model) to use the OpenAI Responses API (POST /responses, currently only deepseek-v4-flash), or convention = "anthropic" to use the Anthropic Messages API on https://api.deepseek.com/anthropic
anthropic	Anthropic Messages (POST /messages)	Native tools/streaming; set access_key_or_token (API key)

Model-level preset / url overrides on a catalog entry can route a single provider name to a different API (e.g. gateway + Anthropic model). DeepSeek models may also carry a per-model convention (empty = inherit the provider-level one), e.g. serve deepseek-v4-flash over Responses while deepseek-v4-pro stays Chat Completions:

[providers.deepseek]
preset = "deepseek"
access_key_or_token = "sk-..."

[providers.deepseek.models]
"deepseek-v4-flash" = { text = true, convention = "responses" }
"deepseek-v4-pro" = { text = true }

DeepSeek's Anthropic convention (convention = "anthropic") points at https://api.deepseek.com/anthropic by default and is fully supported by the agent's Anthropic Messages path (tools, streaming, usage). DeepSeek maps claude-opus* model ids to deepseek-v4-pro and claude-haiku* / claude-sonnet* (and unknown ids) to deepseek-v4-flash server-side; real deepseek-v4-* ids pass through as-is. GET /models is not documented on that base, so model selection is config-driven.

If [database] is omitted (or SQLite url is unset/empty), chat uses a durable file under the user data dir (e.g. ~/.local/share/plyngent/chat.db on Linux). Set url = ":memory:" for a true in-memory SQLite (CLI warns; no file; useful for tests).

Chat

Interactive REPL

plyngent chat
plyngent chat --provider local --model gpt-4o-mini
plyngent chat --workspace /path/to/project --new
plyngent chat --session 3

Flag	Meaning
--provider / --model	Select from config (required when multiple and non-interactive)
--workspace	Tool root (default: cwd); sessions bind to this path
--new / --session ID	Fresh session vs resume by id
--tools / --no-tools	Default tools on
--max-rounds	Tool-loop rounds per turn (default 32)
--stream / --no-stream	Streaming deltas (default on)
--quiet	Less status on stderr
--yes	YOLO on: skip destructive-tool confirms for this process
--auto-continue	Auto-raise tool/PTY limits without prompting (like answering yyy)
--log-level	On the root CLI: DEBUG, INFO, WARNING, …

Sessions resume the most recently updated session for the current workspace unless you pass --new or --session. Each session remembers the last provider and model (restored on resume so you are not re-prompted). A session resumed by a fresh plyngent process also gets a [notice] resume: … line: the model is told that process-scoped state — PTY sessions, running commands, temporary workspaces — did not survive the restart, and that an unfinished turn may have been cut off. The notice is kept with the transcript; --quiet hides only the user-facing line.

When a tool-loop or PTY limit is hit, the prompt accepts y (continue once), n (stop), or yyy — stop asking for the rest of this turn (the next user turn prompts again). --auto-continue / [agent] auto_continue_limits = true skip the prompt for every turn.

Tool calls show progress as they run: known tools (read_file, run_argv, grep_files, …) print a * Read 'src/x.py' prefix the moment the call starts, and the outcome (L1-80 (done), (exit code 0)) is appended once the result lands. Piped output and --verbose print the finished line as before.

One-shot (scripts / CI)

plyngent chat -p "Summarize README.md" --provider local --model gpt-4o-mini --no-stream
echo "hello" | plyngent chat --provider local --model gpt-4o-mini

Exit codes (one-shot):

Code	Meaning
0	Success
1	Config / usage error
2	Cancelled
3	Turn failed (API / incomplete)

Input ergonomics

• Multiline: start a message with """, end a later line with """.
• /edit: compose a turn in $VISUAL/$EDITOR (blocking only; empty cancels).
• Tab: completes slash commands and some arguments (provider, model, on/off, export, /help targets).

Slash commands

Type /help in the REPL for the live list. Common ones:

Command	Purpose
/status	Provider, session, context/usage estimates
/history [N | last [N]]	Conversation grouped by turn: default = the last turn (your message + the model's answer); N = turn N, last N = the last N turns
/history -v / -vv	-v prints every row of the selected turn(s) (tool calls/results, notices); -vv prints full bodies (and the local system row). --message N prints one message in full, --preview one-lines every row. Numbers are display ordinals shown by /history, never database rows (they restart after /clear)
/sessions	Sessions for this workspace
/new /resume /rename /delete	Session lifecycle (/delete confirms)
/export [md|json] [path]	Transcript from DB (no secrets)
/compact	Soft-compact + model summary into a new session
/stream /verbose /markdown /tools /rounds	Toggles and limits
/yolo [on|off|once]	Soft destructive confirms: sticky skip, off, or next turn only

| /retry | Re-run incomplete last user turn (after error/cancel) | | /btw [--tools read\|no\|full] [--fresh] | Side question without changing the main session (read-only tools by default; the model is told the exchange is unsaved and how its tools are scoped) | | /provider /model | Switch without restarting | | /model --persist | Save current model id into plyngent.toml catalog | | /models | List config + remote GET /models (always re-fetches) | | /models --persist | Merge remote catalog into TOML for this provider | | /todos | Todo/task stack: list, push, pop, done, clear | | /grants | Directory-access grants: list, or revoke <index\|all> | | /config | Edit plyngent.toml ($VISUAL/$EDITOR or system open); reload after blocking editor | | /quit | Leave the REPL |

User messages are saved immediately. On API error or Ctrl+C, partial assistant/tool output is discarded but the user message stays so /retry works after resume. Interactive auto-retry waits 5s, 10s, 15s, 20s, then +10s each step (10 attempts); an attempt that gets a full model round back resets that budget, so a connection that recovers and drops again starts over from 5s.

Ctrl+C cancels the in-flight turn, and during the auto-retry countdown it cancels the retry. Model-initiated prompts run off the event loop: a wait prompt is cancelled by Ctrl+C (the tool reports cancelled by user and the turn continues), while ask_user_* and confirm prompts ignore it with a one-line hint — answer them to continue. Ctrl+C never exits the REPL (use Ctrl+D or /quit), and MCP servers run in their own process group, so it never kills them either.

Workspace model

• Workspace = root for file/process/VCS tools (default cwd).
• Session = SQLite chat bound to a workspace path.
• Paths outside the workspace need a directory-access grant: the model calls request_directory_access (read / write / exec), the human approves at the requested level or another one (timed y/N, default deny; --yes//yolo auto-approve as a process-only grant), and approval lasts for the session (/grants lists/revokes). Static pre-allow lives under [agent].allow_paths. The path denylist always wins, and grants gate path-resolving tools only — they are not a sandbox (run_argv/PTY reach the whole filesystem).
• Resuming a session from another directory prompts: keep session workspace, rebind to current, or abort.

Tools (when enabled)

Default registry: file ops (including tree with a markdown bullet-list default, flat paths or classic decorated on demand; default noise-dir skips), run_argv / run_argv_batch / PTY (POSIX openpty; Windows ConPTY via pywinpty), read-only VCS (git), HTTP fetch (GET/POST/PUT/DELETE via niquests; private/loopback hosts need a human policy grant, not YOLO), human prompts (ask_user_line / ask_user_choice / ask_user_form), wait (line prompt with timeout; Enter disturbs), request_directory_access (out-of-workspace access grants), get_truncated (resume any truncated result via its truncate_token=...), and todo stack tools (todo_list / todo_push / todo_pop / todo_update / todo_clear).

Safety defaults:

• Paths stay under the workspace unless granted (request_directory_access / [agent].allow_paths); optional path_denylist substrings always apply (tree also skips denylisted children by default).

• Command basename denylist (e.g. dangerous shells/utilities).

• Destructive tools (delete/move/overwrite) can require confirm (confirm_destructive; default deny in non-TTY). Override for the session with /yolo on|off|once or startup --yes (path/command denylists still apply).

• PTY sessions: caps, idle TTL, output budget; master FD is non-inheritable; sessions closed on chat exit. Prefer file tools over full-screen editors (vim/nano) for edits. read_pty sanitizes CSI/controls so tool results cannot reprogram the host TTY (no host terminal reset on exit). write_pty is literal text only; use write_pty_keys for \xHH, ctrl+x, key=esc|enter|…. For passwords/sudo/ssh prompts use ask_into_pty (human types locally; answer never returns to the model).

• Mis-typed tool arguments are answered, never guessed: a string where an array is expected (run_argv argv, ask_user_choice options, ask_user_form fields), a call that omits a required argument, or a non-numeric wait duration (numeric strings are accepted) returns an error showing the shape/names to send — the human never sees a garbage prompt, and no confirm prompt fires for a call that cannot run.

Usage / context (CLI)

• Context size prefers API prompt_tokens from the last model call; otherwise a char-based estimate (~4 chars/token).
• Turn/session usage sum billed completion usage across tool rounds (history is re-sent each round).
• Soft compact can calibrate from reported prompt_tokens. See /status.

Other commands

plyngent providers          # list configured providers
plyngent config path|edit
plyngent --log-level INFO chat ...

Architecture (short)

See doc/architecture.md and AGENTS.md for developers.

• lmproto/ — OpenAI-compatible, OpenAI Responses, Anthropic Messages, DeepSeek msgspec models and async SSE clients
• agent/ — kind-based tool loop (chat_completions / responses / messages), streaming, usage, compact
• memory/ — async SQLAlchemy sessions/messages
• tools/ — workspace tools
• cli/ — Click entry + slash registry (awaitlet bridges sync Click to async work)
• Multi-tenant / web (router/, real web/) are not in scope for the single-user CLI (Phase H).

License

MIT