docs: document server API endpoints (#2019)

Co-authored-by: Jay <[email protected]>

3 files changed, 132 insertions, 2 deletions

diff --git a/packages/web/astro.config.mjs b/packages/web/astro.config.mjs
index 0ee6c4f27..da426e446 100644
--- a/packages/web/astro.config.mjs
+++ b/packages/web/astro.config.mjs
@@ -69,7 +69,7 @@ export default defineConfig({
 
         {
           label: "Usage",
-          items: ["docs/tui", "docs/cli", "docs/ide", "docs/share", "docs/github"],
+          items: ["docs/tui", "docs/cli", "docs/ide", "docs/share", "docs/server", "docs/github"],
         },
 
         {
diff --git a/packages/web/src/content/docs/docs/cli.mdx b/packages/web/src/content/docs/docs/cli.mdx
index 65d96769a..6237e4eb3 100644
--- a/packages/web/src/content/docs/docs/cli.mdx
+++ b/packages/web/src/content/docs/docs/cli.mdx
@@ -176,7 +176,7 @@ opencode run Explain the use of context in Go
 
 ### serve
 
-Start a headless opencode server for API access.
+Start a headless opencode server for API access. See [Server API](/docs/server) for the full HTTP interface.
 
 ```bash
 opencode serve
diff --git a/packages/web/src/content/docs/docs/server.mdx b/packages/web/src/content/docs/docs/server.mdx
new file mode 100644
index 000000000..90a67e6f4
--- /dev/null
+++ b/packages/web/src/content/docs/docs/server.mdx
@@ -0,0 +1,130 @@
+---
+title: Server API
+description: Interact with opencode over HTTP using `opencode serve`.
+---
+
+## Overview
+
+`opencode serve` runs a headless HTTP server that exposes the same features as the TUI. The server is intended for automation and remote control.
+
+## Starting the server
+
+```bash
+opencode serve [--port <number>] [--hostname <string>]
+```
+
+### Options
+
+| Flag         | Short | Description           | Default     |
+| ------------ | ----- | --------------------- | ----------- |
+| `--port`     | `-p`  | Port to listen on     | `4096`      |
+| `--hostname` | `-h`  | Hostname to listen on | `127.0.0.1` |
+
+## Documentation
+
+The server publishes an OpenAPI 3.1 spec and an interactive explorer at:
+
+```
+http://<hostname>:<port>/doc
+```
+
+Use the spec to generate clients or inspect request and response types. All examples below use `curl` with the default `localhost:4096`.
+
+## API Endpoints
+
+### App & Config
+
+| Method | Path                | Description                       | Response |
+| ------ | ------------------- | --------------------------------- | -------- |
+| `GET`  | `/app`              | Get app info                      | [`App`](packages/sdk/js/src/gen/types.gen.ts) |
+| `POST` | `/app/init`         | Initialize the app                | `boolean` |
+| `GET`  | `/config`           | Get config info                   | [`Config`](packages/sdk/js/src/gen/types.gen.ts) |
+| `GET`  | `/config/providers` | List providers and default models | `{ providers: `[`Provider[]`](packages/sdk/js/src/gen/types.gen.ts)`, default: { [key: string]: string } }` |
+
+### Sessions
+
+| Method   | Path                                     | Description                        | Notes                                      |
+| -------- | ---------------------------------------- | ---------------------------------- | ------------------------------------------ |
+| `GET`    | `/session`                               | List sessions                      | Returns [`Session[]`](packages/sdk/js/src/gen/types.gen.ts)                                            |
+| `GET`    | `/session/:id`                           | Get session                        | Returns [`Session`](packages/sdk/js/src/gen/types.gen.ts)                                            |
+| `GET`    | `/session/:id/children`                  | List child sessions                | Returns [`Session[]`](packages/sdk/js/src/gen/types.gen.ts)                                            |
+| `POST`   | `/session`                               | Create session                     | body: `{ parentID?, title? }`, returns [`Session`](packages/sdk/js/src/gen/types.gen.ts)              |
+| `DELETE` | `/session/:id`                           | Delete session                     |                                            |
+| `PATCH`  | `/session/:id`                           | Update session properties          | body: `{ title? }`, returns [`Session`](packages/sdk/js/src/gen/types.gen.ts)                         |
+| `POST`   | `/session/:id/init`                      | Analyze app and create `AGENTS.md` | body: `{ messageID, providerID, modelID }` |
+| `POST`   | `/session/:id/abort`                     | Abort a running session            |                                            |
+| `POST`   | `/session/:id/share`                     | Share session                      | Returns [`Session`](packages/sdk/js/src/gen/types.gen.ts)                                            |
+| `DELETE` | `/session/:id/share`                     | Unshare session                    | Returns [`Session`](packages/sdk/js/src/gen/types.gen.ts)                                            |
+| `POST`   | `/session/:id/summarize`                 | Summarize session                  |                                            |
+| `GET`    | `/session/:id/message`                   | List messages in a session         | Returns `{ info: `[`Message`](packages/sdk/js/src/gen/types.gen.ts)`, parts: `[`Part[]`](packages/sdk/js/src/gen/types.gen.ts)`}[]`                                            |
+| `GET`    | `/session/:id/message/:messageID`        | Get message details                | Returns `{ info: `[`Message`](packages/sdk/js/src/gen/types.gen.ts)`, parts: `[`Part[]`](packages/sdk/js/src/gen/types.gen.ts)`}`                                            |
+| `POST`   | `/session/:id/message`                   | Send chat message                  | body matches [`ChatInput`](https://github.com/sst/opencode/blob/main/packages/opencode/src/session/index.ts#L358), returns [`Message`](packages/sdk/js/src/gen/types.gen.ts)                   |
+| `POST`   | `/session/:id/shell`                     | Run a shell command                | body matches [`CommandInput`](https://github.com/sst/opencode/blob/main/packages/opencode/src/session/index.ts#L1007), returns [`Message`](packages/sdk/js/src/gen/types.gen.ts)                |
+| `POST`   | `/session/:id/revert`                    | Revert a message                   | body: `{ messageID }`                      |
+| `POST`   | `/session/:id/unrevert`                  | Restore reverted messages          |                                            |
+| `POST`   | `/session/:id/permissions/:permissionID` | Respond to a permission request    | body: `{ response }`                       |
+
+### Search & Files
+
+| Method | Path                     | Description                  | Response |
+| ------ | ------------------------ | ---------------------------- | -------- |
+| `GET`  | `/find?pattern=<pat>`    | Search for text in files     | Array of match objects with `path`, `lines`, `line_number`, `absolute_offset`, `submatches` |
+| `GET`  | `/find/file?query=<q>`   | Find files by name           | `string[]` (file paths) |
+| `GET`  | `/find/symbol?query=<q>` | Find workspace symbols       | [`Symbol[]`](packages/sdk/js/src/gen/types.gen.ts) |
+| `GET`  | `/file?path=<path>`      | Read a file                  | `{ type: "raw" \| "patch", content: string }` |
+| `GET`  | `/file/status`           | Get status for tracked files | [`File[]`](packages/sdk/js/src/gen/types.gen.ts) |
+
+### Logging
+
+| Method | Path   | Description                                                      | Response |
+| ------ | ------ | ---------------------------------------------------------------- | -------- |
+| `POST` | `/log` | Write log entry. Body: `{ service, level, message, extra? }`    | `boolean` |
+
+### Agents
+
+| Method | Path     | Description              | Response |
+| ------ | -------- | ------------------------ | -------- |
+| `GET`  | `/agent` | List all available agents | [`Agent[]`](packages/sdk/js/src/gen/types.gen.ts) |
+
+### TUI Control
+
+| Method       | Path                   | Description                                 | Response |
+| ------------ | ---------------------- | ------------------------------------------- | -------- |
+| `POST`       | `/tui/append-prompt`   | Append text to the prompt                   | `boolean` |
+| `POST`       | `/tui/open-help`       | Open the help dialog                        | `boolean` |
+| `POST`       | `/tui/open-sessions`   | Open the session selector                   | `boolean` |
+| `POST`       | `/tui/open-themes`     | Open the theme selector                     | `boolean` |
+| `POST`       | `/tui/open-models`     | Open the model selector                     | `boolean` |
+| `POST`       | `/tui/submit-prompt`   | Submit the current prompt                   | `boolean` |
+| `POST`       | `/tui/clear-prompt`    | Clear the prompt                            | `boolean` |
+| `POST`       | `/tui/execute-command` | Execute a command (`{ command }`)           | `boolean` |
+| `POST`       | `/tui/show-toast`      | Show toast (`{ title?, message, variant }`) | `boolean` |
+| `GET`        | `/tui/control/next`    | Wait for the next control request          | Control request object |
+| `POST`       | `/tui/control/response` | Respond to a control request (`{ body }`)   | `boolean` |
+
+### Authentication
+
+| Method | Path        | Description                                                      | Response |
+| ------ | ----------- | ---------------------------------------------------------------- | -------- |
+| `PUT`  | `/auth/:id` | Set authentication credentials. Body must match provider schema  | `boolean` |
+
+### Events
+
+| Method | Path     | Description                                                                    | Response |
+| ------ | -------- | ------------------------------------------------------------------------------ | -------- |
+| `GET`  | `/event` | Server-sent events stream. First event is `server.connected`, then bus events | Server-sent events stream |
+
+### Documentation
+
+| Method | Path   | Description                           | Response |
+| ------ | ------ | ------------------------------------- | -------- |
+| `GET`  | `/doc`  | OpenAPI 3.1 specification and explorer | HTML page with OpenAPI spec and Swagger UI |
+
+## Example
+
+```bash
+# fetch current app info
+curl http://localhost:4096/app
+```
+
+Use the OpenAPI spec for complete schemas and additional endpoints.