5 OneChat is one AI agent in a single chat that never ends. A daemon owns
6 the agent and its files, and a terminal client and a Telegram bot talk
7 to it. It is in early development. Linux is supported.
13 OneChat keeps its data and its token file in one directory. It uses the
16 #. ``ONECHAT_DIR``, when it is set.
17 #. ``$XDG_DATA_HOME/onechat``, when ``XDG_DATA_HOME`` is an absolute
18 path. A relative value is ignored.
19 #. ``~/.local/share/onechat``. With no home directory, OneChat exits
22 OneChat creates the directory with mode 0700.
28 ``config.json`` in the data directory holds the settings. OneChat does
29 not create it. A missing file or field takes the default, and an unknown
35 "endpoint": "chatgpt",
36 "compactor": {"model": "gpt-6.1-sol", "effort": "high"}
40 ``chatgpt`` (the default) sends model calls to the ChatGPT backend
41 with the subscription login. ``api`` sends them to the OpenAI API
42 with the key in ``OPENAI_API_KEY``, which must then be set. With
43 ``chatgpt``, OneChat ignores ``OPENAI_API_KEY``.
46 The model and the reasoning effort of the summaries. The defaults are
47 ``gpt-6.1-sol`` and ``high``.
53 The ``chatgpt`` endpoint needs a login with a ChatGPT account:
59 The command shows a link and a code. Open the link on any device, enter
60 the code, and approve the login. Device code login must be allowed in
61 the ChatGPT security settings. OneChat writes the tokens to
62 ``auth.json`` in the data directory, with mode 0600, and refreshes them
63 before they expire. The file belongs to OneChat only. Do not share it
64 with the Codex CLI, because each program rotates the refresh token and
71 Start the daemon, and then the client in another terminal:
78 The daemon owns the root agent in ``agent/`` in the data directory and
79 listens on the Unix socket ``onechat.sock`` there. In the client, each
80 line is a message to the agent, the line ``/stop`` interrupts the
81 running turn, and Ctrl-D ends the client. The client shows the replies,
82 the tool calls, and the first lines of each tool result as they happen.
83 It also shows each message that the user sends from another client, with
84 the client as a mark, such as ``[telegram] text``. The daemon is the
85 only process that uses the token file while it runs, so ``onechat
86 login`` and ``onechat probe`` refuse to start until it stops.
88 The agent runs commands with bash as the user in its working directory,
89 with no sandbox. It has the rights of the user, also on the token file.
91 ``agent/config.json`` holds the settings of the agent. The first start
92 writes it with the defaults and a random ID. Do not change the ID: the
93 prompt cache key comes from it.
99 "id": "0123456789abcdef0123456789abcdef",
100 "model": "gpt-6.1-sol",
102 "workdir": "/home/user"
105 ``workdir`` is an absolute path, and its default is the home directory.
106 ``agent/instructions.md`` holds the user's instructions: who they are,
107 how their files are organized, and how they want work done. The prompt
108 ends with them, and a change applies at the next call.
114 The daemon also connects the agent to a Telegram bot when
115 ``telegram.json`` exists in the data directory. It polls the Bot API for
116 new messages, so it needs no open port.
118 #. Make a bot with BotFather and keep its token.
120 #. Find your numeric Telegram user ID.
122 #. Write the token and the ID to ``telegram.json``, and give the file
123 mode 0600, because the token is a secret. The daemon refuses the file
126 #. Start the daemon, open a private chat with the bot, and write.
130 {"token": "123456:ABC-token-from-BotFather", "owner": 123456789}
132 The bot reads only the private chat of the owner and ignores all other
133 updates. Each text message goes to the agent as a user message, and the
134 line ``/stop`` interrupts the running turn. The bot sends the replies in
135 parts of at most 4096 characters, with their Markdown as Telegram
136 formats: bold, italic, strikethrough, code, code blocks, links, and
137 headings as bold text. When Telegram refuses the formats of a part, the
138 bot sends the part again as plain text. Each error goes as a short
139 message in plain text. It shows the typing action while a turn runs. It
140 does not send the tool calls. It sends each message that the user types
141 in the terminal client, with the mark ``[terminal]``.
143 ``agent/telegram-offset.json`` holds the ID of the next update. The bot
144 moves it past an update only after the message is durable in the log, so
145 a restart of the daemon does not lose a message. A crash just after the
146 write of a message can make the message repeat once. A network failure
147 or a rate limit makes the bot wait and try again, and does not stop the
154 ``onechat probe LOG COUNT [BUILDS]`` measures the compactor on a log. It
155 appends the first COUNT messages of LOG, one JSON object ``{"kind",
156 "text"}`` on each line, to a new chat in ``probe/`` in the data
157 directory, and builds its tree with real model calls. The calls use the
158 quota of the account. The run stops at the first failed call, after 660
159 calls, or when the used percent of a quota window grows by more than 15
160 points. At the end it reports the calls per message, the cached share of
161 the input tokens, the retries, the line sizes, and the quota at the
162 first and the last call. BUILDS, from 1 to 8, limits the model calls at
165 A test writes a generated log of readable made-up messages:
169 ONECHAT_PROBE_LOG=probe.jsonl go test -run TestProbeLogHasTheSyntheticMix
175 Nix supplies the Go toolchain and all tools. Enter the development shell
182 Or enter it directly:
188 The shell sets ``ONECHAT_DIR`` to ``.devenv/onechat`` in the checkout,
189 unless it is already set. Development data goes there, and Git ignores
199 Format and check all files:
207 ``bin/check`` and ``nix build`` run a short replay of the synthetic log.
208 ``nix flake check`` also runs the full replay of 100,000 messages.