Reference: the configuration file

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# Reference: the configuration file

- **Format version**: 1
- **Issue**: [#4 — Spécifier le format du fichier de configuration YAML](../../../.tickets/issues/0004-specifier-le-format-du-fichier-de-configuration.yaml)
- **Schema**: [schema/config.schema.json](../../../schema/config.schema.json) (JSON Schema 2020-12), checked by `go test ./schema`
- **Example**: [examples/test-agents.yaml](../../../examples/test-agents.yaml)

One YAML file describes the agents Sidekicks can talk to, the channels created at startup, and preferences. Conversations, messages and ACP sessions are not in it (see [Architecture](../explanation/architecture.md)).

The application reads it with the Go package `internal/config` (milestone M1): validation, defaults, paths, the default file, reloading on every save.

## Location

The file is looked up in this order; the first one that applies wins:

| # | Source | Example |
| --- | --- | --- |
| 1 | `--config <path>` command-line flag | `sidekicks --config ~/agents/team.yaml` |
| 2 | `SIDEKICKS_CONFIG` environment variable | `SIDEKICKS_CONFIG=~/agents/team.yaml` |
| 3 | the last file opened from the application (Settings → **Open…** or **Recent…**), kept in `<user config dir>/sidekicks/preferences.json` | — |
| 4 | the default location: `<user config dir>/sidekicks/config.yaml` | macOS: `~/Library/Application Support/sidekicks/config.yaml`, Linux: `~/.config/sidekicks/config.yaml` |

`<user config dir>` is Go's `os.UserConfigDir()`. When the default file does not exist, Sidekicks creates it with comments explaining each key (issue #9).

## Paths

- A relative path is resolved **against the folder of the configuration file**, never against the current directory. A folder holding a configuration and its agents can therefore be moved or versioned with git as a whole.
- `~` at the start of a path is the user's home folder.
- `command`: a bare name (`mm`, `docker`) is looked up in `PATH`; anything containing `/` is a path, resolved as above.
- `args` are passed as they are, without rewriting: the agent process starts in its `workspace`, so arguments relative to the workspace work.

## Keys

### Top level

| Key | Type | Required | Default | Meaning |
| --- | --- | --- | --- | --- |
| `version` | integer | yes | — | Format version; only `1` exists. A later format increments it, so Sidekicks can migrate or refuse an old file explicitly. |
| `ui` | object | no | | Interface preferences. |
| `limits` | object | no | | Resource limits. |
| `agents` | list of agents | yes | | The agents available with `@name`. May be empty. |
| `channels` | list of channels | no | `[]` | Channels created at startup when they do not exist yet. |

Unknown keys are **errors**, at every level: a misspelt `comand:` must be reported, not silently ignored.

### `ui`

| Key | Values | Default | Meaning |
| --- | --- | --- | --- |
| `theme` | `system`, `light`, `dark` | `system` | Colour theme; `system` follows the operating system. |
| `language` | `en`, `fr` | `en` | Language of the interface: its labels and the configuration error messages. |

### `limits`

| Key | Type | Default | Meaning |
| --- | --- | --- | --- |
| `maxRunningAgents` | integer ≥ 1 | `2` | Agents running at the same time. Each local agent keeps a model in memory; the default fits a 32 GB laptop with small models. |
| `stopIdleAgentsAfter` | Go duration (`30s`, `10m`, `1h30m`), or `0` (number or text) | `10m` | Stops an agent unused for this long, to free its memory. `0` never stops it. |

### An agent

| Key | Type | Required | Default | Meaning |
| --- | --- | --- | --- | --- |
| `name` | identifier | yes | | Lowercase letters, digits, `-`, `_`; starts with a letter; 32 characters at most. Used as `@name` and `/name:command`. **Unique.** |
| `title` | text | no | `name` | Name shown in the interface. |
| `icon` | text (an emoji) | no | | Shown next to the agent. |
| `description` | text | no | | One sentence shown in the `@` list. |
| `command` | text | yes | | Program serving ACP on stdio. |
| `args` | list of text | no | `[]` | Its arguments. |
| `env` | map text → text | no | | Extra environment variables. |
| `afterStop` | list of text, at least one | no | | Command run each time the agent's process ends — stopped, crashed, stopped to make room, or Sidekicks quitting: the program (a bare name is looked up in PATH, a path is relative to this file), then its arguments. It runs in `workspace` with `env`, for 30 s at most; its output goes to the agent's log; Sidekicks waits for it before quitting. A program that cannot be found is a warning. Example: `[../scripts/agents.sh, unload, alice]` to unload the model. |
| `workspace` | path | no | the configuration folder | The agent's folder: the process starts there and it is the `cwd` of its ACP sessions. mm reads `AGENTS.md` and `skills/` from it. |
| `runtime` | object | no | `{type: local}` | Where the agent runs (see below). |

### `runtime`

The runtime tells Sidekicks how to reach the agent's **files and terminal** (Agents panel, issue #28). It does not change how the agent is started: `command` and `args` do that.

| `type` | Extra keys | Meaning |
| --- | --- | --- |
| `local` | none | The agent runs on this computer; `workspace` is a local folder. |
| `container` | `container` (required), `workspacePath` | The agent runs in a running Docker container; files and terminal go through `docker exec`. |
| `sbx` | `sandbox` (required), `workspacePath` | The agent runs in a Docker sandbox (`sbx`); files and terminal go through `sbx exec`. |

`workspacePath` is an absolute path inside the container or the sandbox; it defaults to `workspace` (the same path, as with a bind mount). Behaviour of each runtime: [workspaces](agents-and-events.md#workspaces-milestone-m4).

### A channel

| Key | Type | Required | Meaning |
| --- | --- | --- | --- |
| `name` | text, 1–64 characters | yes | Shown as `#name`. **Unique.** May contain accents and spaces. |
| `description` | text | no | Shown when hovering the channel's name, and in an empty channel. |
| `agents` | list of agent names | no | Members of the channel. A listed agent that is not a member yet is added at startup and when the file is reloaded; removing it from the list removes nothing. No duplicates. |

A channel declared here is created at startup, or when the file is reloaded, **if no channel has this name yet** (whatever the case); after that it lives in the application like any other channel, and can be renamed or deleted there. Removing it from the file does not delete it (deleting history must be an explicit user action). Each configuration file has its own channels and history ([where it is kept](agents-and-events.md#history)).

## Rules checked by the loader, not by the schema

JSON Schema cannot express them; the configuration loader (issue #9) checks them and reports them like schema errors:

1. agent names are unique;
2. channel names are unique;
3. every name in a channel's `agents` is the name of an agent;
4. `command` exists (in `PATH`, or as a file) — reported as a warning, since an agent may be installed later.

## Error messages

Every error names the line and the key, in the language of the interface, and says how to fix it. Examples with the interface in English (the default):

| Problem | Message |
| --- | --- |
| `name: Alice Smith` | line 12 — agents[0].name: "Alice Smith" is not a valid name: lowercase letters, digits, "-" or "_", no space, starting with a letter (e.g. "alice") |
| `comand: mm` | line 14 — agents[0].comand: unknown key "comand"; did you mean "command"? |
| `command` missing | line 3 — agents[0]: the key "command" is missing |

## Full example

```yaml
version: 1

ui:
  theme: system
  language: fr

limits:
  maxRunningAgents: 2
  stopIdleAgentsAfter: 10m

agents:
  - name: alice
    title: Alice (assistante)
    icon: "👩"
    description: Questions simples, sans outils
    command: mm
    args: ["-acp", "-config", "agent.yaml"]
    workspace: ./agents/alice

  - name: garfield
    title: Garfield (traducteur)
    icon: "🐮"
    command: mm
    args: ["-acp", "-config", "agent.yaml"]
    workspace: ./agents/garfield

  - name: translator-sbx
    title: Traducteur (sandbox)
    command: sbx
    args: ["exec", "-i", "mm-translator", "mm", "-acp"]
    workspace: ./agents/translator/workspace
    runtime:
      type: sbx
      sandbox: mm-translator

channels:
  - name: général
    agents: [alice]
  - name: traductions
    agents: [garfield]
```

`sbx exec -i <sandbox> <program>` runs the agent inside the sandbox; sbx mounts the host folder at the same path, so `workspace` is also the folder seen inside it. This example is also a test fixture (`schema/testdata/valid/spec-example.yaml`).

## Go package `schema`

`git.rickub.com/bots-garden/sidekicks/schema` embeds the JSON Schema and validates documents against it.

| Identifier | Signature | Description |
| --- | --- | --- |
| `ConfigSchemaURL` | `const string` | The schema's `$id`: `https://git.rickub.com/bots-garden/sidekicks/schema/config.schema.json`. |
| `ConfigSchema` | `func() []byte` | A copy of the JSON Schema document. |
| `ValidateConfig` | `func(document []byte) error` | `nil` if the YAML document matches the schema; a YAML syntax error if it cannot be parsed; a `*jsonschema.ValidationError` listing every violation otherwise. |

```go
if err := schema.ValidateConfig(content); err != nil {
    fmt.Println("invalid configuration:", err)
}
```

A violation as returned by `ValidateConfig`:

```text
jsonschema validation failed with 'https://git.rickub.com/bots-garden/sidekicks/schema/config.schema.json#'
- at '/agents/0': additional properties 'comand' not allowed
```