100 lines
3.9 KiB
Markdown
100 lines
3.9 KiB
Markdown
# Sausage
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You can see how the sausage is made.
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Sausage is a world of small WASI programs ("plugins") that you grow by
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talking to it. A plugin is a `.wasm` file with JSON-RPC methods. Each call
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to a plugin starts a new process. The agent is a plugin too: it writes new
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plugins in Rust, builds them, tests them, activates them, and can change its
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own code.
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## Start
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You need [Nix](https://nixos.org/download) with flakes, and an API token for
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an LLM (OpenAI Responses or Anthropic Messages API). No clone needed:
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```sh
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nix run git+https://gitea.surma.technology/surma/sausage
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```
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This creates a world in `./world` the first time (it builds the agent, which
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takes a few minutes), then starts it with a console. Later runs start the
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existing world. The two steps on their own:
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```sh
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nix run git+https://gitea.surma.technology/surma/sausage -- init # creates ./world and builds the agent
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nix run git+https://gitea.surma.technology/surma/sausage -- run # starts the world and a console
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```
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`init` asks for the API shape (`openai-responses` or `anthropic-messages`),
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the base URL, the model, and the token. It reads `SAUSAGE_API`,
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`SAUSAGE_BASE_URL`, `SAUSAGE_MODEL`, and `SAUSAGE_API_TOKEN` first. The
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values go to `world/config/agent.json`. Both commands take another folder as
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an argument, for example `... -- run my-world`.
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To keep a world on the newest version, run it in a loop:
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```sh
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nix run git+https://gitea.surma.technology/surma/sausage#loop # ./world, created if needed
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nix run git+https://gitea.surma.technology/surma/sausage#loop -- my-world # an existing world
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```
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When the host crashes or a plugin calls `core.exit`, the loop fetches the
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newest commit and starts it again. `quit` ends the loop. Set `SAUSAGE_FLAKE`
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to run another flake URL instead, for example your fork.
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From a clone (`git clone https://gitea.surma.technology/surma/sausage`), the
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same commands are `nix run`, `nix run -- init`, `nix run -- run`, and
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`nix run .#loop`.
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### Headless
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`--headless` (or `SAUSAGE_HEADLESS=1`) turns the console input off. The host
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runs until SIGTERM or SIGINT (exit code 0) or until a plugin calls
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`core.exit` (exit code 75, so the loop starts the newest version):
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```sh
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nix run git+https://gitea.surma.technology/surma/sausage#loop -- --headless my-world
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```
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## The console
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| Input | Effect |
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| --- | --- |
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| text | a message to the agent (`agent.chat`) |
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| `<plugin>.<method> {json}` | a call. The console prints the result. |
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| `ls [path]`, `cat <path>` | the filesystem as a process sees it, with `/proc` and `/run` |
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| `methods <plugin>` | the methods of a plugin, with params and docs |
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| `ps` | the running processes |
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| `log [plugin or pid] [-n N]` | the journal |
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| `activate <plugin> <wasm>`, `revert <plugin>` | activate a new version, or go back |
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| `stop <pid>`, `kill <pid>` | stop a process |
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| `help`, `quit` | |
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## The world folder
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```text
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plugins/<name>/plugin.wasm the current version of a plugin
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plugins/<name>/source/ its source
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state/<plugin>/ the state of a plugin, by convention
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state/core/journal.sqlite the journal: stderr of all processes, and core events
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config/boot.json the services that start with the world
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config/agent.json the configuration of the agent
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```
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Each process also sees `/proc` (the processes and the state of the core),
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`/self` (its own folder in `/proc`), and `/run` (shared files in memory).
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To replace a plugin by hand, copy a `.wasm` file to its `plugin.wasm`. That
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skips the interface checks. `revert <plugin>` goes back to the version
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before the last activation.
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## More
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- [PROTOCOL.md](PROTOCOL.md): calls, processes, the filesystem, locks,
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interfaces, and `cargo`. Read this to write a plugin in any language.
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- [DECISIONS.md](DECISIONS.md): why Sausage is the way it is.
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- [`sdk/`](sdk/): `sausage-plugin`, the SDK for Rust plugins.
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- [`examples/`](examples/): small plugins.
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- [AGENTS.md](AGENTS.md): how to work on Sausage itself.
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