| 1 | //! `si` as an MCP server over stdio. |
| 2 | //! |
| 3 | //! `si mcp` stops being a one-shot command and becomes a long-lived |
| 4 | //! [Model Context Protocol](https://modelcontextprotocol.io) server, so an |
| 5 | //! agent can do what the CLI does: list repos, read and search code, triage |
| 6 | //! issues, open pull requests, drive Cloud Sessions. |
| 7 | //! |
| 8 | //! sigit.si already serves a remote MCP endpoint at `/api/v1/mcp` (it's what |
| 9 | //! [`sigit_si_api::mcp`] calls into), so a local server only earns its keep by |
| 10 | //! doing what a remote one can't: |
| 11 | //! |
| 12 | //! - **No auth to configure.** It reuses the token `si auth login` stored, so |
| 13 | //! an editor points at a binary and is done — no OAuth dance, no PAT pasted |
| 14 | //! into a config file. |
| 15 | //! - **It knows where you're standing.** Every repo-scoped tool takes `repo` |
| 16 | //! as an *optional* argument and falls back to the sigit.si remote of the |
| 17 | //! working directory, the same way the CLI does. `create_pull_request` |
| 18 | //! likewise defaults `head` to the checked-out branch. |
| 19 | //! - **It reaches the whole CLI.** Cloud Sessions, webhooks, billing, and repo |
| 20 | //! creation are plain REST that the remote MCP endpoint doesn't expose. |
| 21 | //! |
| 22 | //! Tools call the same [`sigit_si_api`] methods the command handlers do, |
| 23 | //! skipping the `ui` layer entirely: stdout is the JSON-RPC channel, so |
| 24 | //! nothing here may print to it. Logging already goes to stderr (see `main`). |
| 25 | //! |
| 26 | //! Toolsets and `--read-only` follow the convention GitHub's `github-mcp-server` |
| 27 | //! set — trimming the tool list keeps the model's choice sharp and its context |
| 28 | //! small. |
| 29 | |
| 30 | use { |
| 31 | crate::{ |
| 32 | cli::McpArgs, |
| 33 | context::Ctx, |
| 34 | git::{self, RepoSlug}, |
| 35 | }, |
| 36 | anyhow::{anyhow, Result}, |
| 37 | rmcp::{ |
| 38 | handler::server::{router::tool::ToolRouter, wrapper::Parameters, ServerHandler}, |
| 39 | model::{CallToolResult, ContentBlock, Implementation, ServerCapabilities, ServerInfo}, |
| 40 | tool, tool_handler, tool_router, |
| 41 | transport::stdio, |
| 42 | ErrorData, ServiceExt, |
| 43 | }, |
| 44 | schemars::JsonSchema, |
| 45 | serde::Deserialize, |
| 46 | sigit_si_api::{Client, NewRepository, State}, |
| 47 | }; |
| 48 | |
| 49 | /// The tool groups `--toolsets` selects from. |
| 50 | const TOOLSETS: [&str; 8] = [ |
| 51 | "account", "repo", "issue", "pr", "code", "hook", "session", "billing", |
| 52 | ]; |
| 53 | |
| 54 | /// The sigit.si MCP server. Holds the same [`Ctx`] the command handlers get, |
| 55 | /// which is where the API client and working-directory repo resolution live. |
| 56 | pub struct SiMcpServer { |
| 57 | ctx: Ctx, |
| 58 | tool_router: ToolRouter<Self>, |
| 59 | } |
| 60 | |
| 61 | impl SiMcpServer { |
| 62 | fn new(ctx: Ctx, tool_router: ToolRouter<Self>) -> Self { |
| 63 | Self { ctx, tool_router } |
| 64 | } |
| 65 | |
| 66 | /// The API client, refusing early when there's no token rather than |
| 67 | /// letting every tool round-trip to a 401. |
| 68 | fn client(&self) -> Result<&Client, ErrorData> { |
| 69 | self.ctx |
| 70 | .require_token() |
| 71 | .map(|()| &self.ctx.client) |
| 72 | .map_err(|e| ErrorData::invalid_request(e.to_string(), None)) |
| 73 | } |
| 74 | |
| 75 | /// Resolve a tool's optional `repo` argument, falling back to the repo the |
| 76 | /// server was started in. |
| 77 | fn repo(&self, explicit: Option<String>) -> Result<String, ErrorData> { |
| 78 | self.ctx |
| 79 | .resolve_repo(explicit) |
| 80 | .map(|slug| slug.to_string()) |
| 81 | .map_err(|e| ErrorData::invalid_request(e.to_string(), None)) |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | /// Serialize a value into a one-block successful tool result. |
| 86 | fn json_result<T: serde::Serialize>(value: &T) -> Result<CallToolResult, ErrorData> { |
| 87 | Ok(CallToolResult::success(vec![ContentBlock::json(value)?])) |
| 88 | } |
| 89 | |
| 90 | fn text_result(message: impl Into<String>) -> Result<CallToolResult, ErrorData> { |
| 91 | Ok(CallToolResult::success(vec![ContentBlock::text( |
| 92 | message.into(), |
| 93 | )])) |
| 94 | } |
| 95 | |
| 96 | fn to_error_data(error: impl std::fmt::Display) -> ErrorData { |
| 97 | ErrorData::internal_error(error.to_string(), None) |
| 98 | } |
| 99 | |
| 100 | /// Which issues or pull requests to list. An enum rather than a string so the |
| 101 | /// advertised schema tells the model what the choices are. |
| 102 | #[derive(Debug, Default, Clone, Copy, Deserialize, JsonSchema)] |
| 103 | #[serde(rename_all = "lowercase")] |
| 104 | enum StateArg { |
| 105 | #[default] |
| 106 | Open, |
| 107 | Closed, |
| 108 | Merged, |
| 109 | All, |
| 110 | } |
| 111 | |
| 112 | impl From<StateArg> for State { |
| 113 | fn from(state: StateArg) -> Self { |
| 114 | match state { |
| 115 | StateArg::Open => State::Open, |
| 116 | StateArg::Closed => State::Closed, |
| 117 | StateArg::Merged => State::Merged, |
| 118 | StateArg::All => State::All, |
| 119 | } |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | /// The `repo` argument every repository-scoped tool shares. |
| 124 | #[derive(Debug, Deserialize, JsonSchema)] |
| 125 | struct RepoArgs { |
| 126 | /// Repository as OWNER/NAME. Defaults to the repository the server is |
| 127 | /// running in. |
| 128 | #[serde(default)] |
| 129 | repo: Option<String>, |
| 130 | } |
| 131 | |
| 132 | // ---------------------------------------------------------------- account -- |
| 133 | |
| 134 | #[tool_router(router = account_router)] |
| 135 | impl SiMcpServer { |
| 136 | /// Show the signed-in sigit.si user: name, email, and plan. |
| 137 | #[tool(annotations(read_only_hint = true))] |
| 138 | async fn whoami(&self) -> Result<CallToolResult, ErrorData> { |
| 139 | let user = self.client()?.user().await.map_err(to_error_data)?; |
| 140 | json_result(&user) |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | // ------------------------------------------------------------------- repo -- |
| 145 | |
| 146 | #[derive(Debug, Deserialize, JsonSchema)] |
| 147 | struct ListRepositoriesArgs { |
| 148 | /// Case-insensitive substring of the owner or repository name. Omit to |
| 149 | /// list everything visible. |
| 150 | #[serde(default)] |
| 151 | query: Option<String>, |
| 152 | /// How many repositories to return. Defaults to the server's own limit. |
| 153 | #[serde(default)] |
| 154 | limit: Option<u32>, |
| 155 | } |
| 156 | |
| 157 | #[derive(Debug, Deserialize, JsonSchema)] |
| 158 | struct CreateRepositoryArgs { |
| 159 | /// Name for the new repository. |
| 160 | name: String, |
| 161 | /// Whether the repository is private. Defaults to public. |
| 162 | #[serde(default)] |
| 163 | private: bool, |
| 164 | /// Optional one-line description. |
| 165 | #[serde(default)] |
| 166 | description: Option<String>, |
| 167 | } |
| 168 | |
| 169 | #[tool_router(router = repo_router)] |
| 170 | impl SiMcpServer { |
| 171 | /// Search every repository the user can see by an owner/name substring. |
| 172 | /// Use this to find the OWNER/NAME other tools take. |
| 173 | #[tool(annotations(read_only_hint = true))] |
| 174 | async fn list_repositories( |
| 175 | &self, |
| 176 | Parameters(ListRepositoriesArgs { query, limit }): Parameters<ListRepositoriesArgs>, |
| 177 | ) -> Result<CallToolResult, ErrorData> { |
| 178 | let repos = self |
| 179 | .client()? |
| 180 | .search_repos(query.as_deref(), limit) |
| 181 | .await |
| 182 | .map_err(to_error_data)?; |
| 183 | json_result(&repos) |
| 184 | } |
| 185 | |
| 186 | /// List the repositories the signed-in user owns, newest first. |
| 187 | #[tool(annotations(read_only_hint = true))] |
| 188 | async fn list_my_repositories(&self) -> Result<CallToolResult, ErrorData> { |
| 189 | let repos = self.client()?.repos().await.map_err(to_error_data)?; |
| 190 | json_result(&repos) |
| 191 | } |
| 192 | |
| 193 | /// Identify the sigit.si repository and branch the server is running in. |
| 194 | /// Call this to find out what "the current repo" resolves to. |
| 195 | #[tool(annotations(read_only_hint = true))] |
| 196 | async fn current_repository(&self) -> Result<CallToolResult, ErrorData> { |
| 197 | let cwd = std::env::current_dir().map_err(to_error_data)?; |
| 198 | let slug: RepoSlug = self |
| 199 | .ctx |
| 200 | .resolve_repo(None) |
| 201 | .map_err(|e| ErrorData::invalid_request(e.to_string(), None))?; |
| 202 | |
| 203 | json_result(&serde_json::json!({ |
| 204 | "repo": slug.to_string(), |
| 205 | "owner": slug.owner, |
| 206 | "name": slug.name, |
| 207 | "branch": git::current_branch(&cwd), |
| 208 | "directory": cwd.display().to_string(), |
| 209 | })) |
| 210 | } |
| 211 | |
| 212 | /// Create a new, empty repository to push to. |
| 213 | #[tool] |
| 214 | async fn create_repository( |
| 215 | &self, |
| 216 | Parameters(CreateRepositoryArgs { |
| 217 | name, |
| 218 | private, |
| 219 | description, |
| 220 | }): Parameters<CreateRepositoryArgs>, |
| 221 | ) -> Result<CallToolResult, ErrorData> { |
| 222 | let new_repo = NewRepository::new(name) |
| 223 | .private(private) |
| 224 | .description(description); |
| 225 | let repo = self |
| 226 | .client()? |
| 227 | .create_repo(&new_repo) |
| 228 | .await |
| 229 | .map_err(to_error_data)?; |
| 230 | json_result(&repo) |
| 231 | } |
| 232 | } |
| 233 | |
| 234 | // ------------------------------------------------------------------ issue -- |
| 235 | |
| 236 | #[derive(Debug, Deserialize, JsonSchema)] |
| 237 | struct ListIssuesArgs { |
| 238 | /// Repository as OWNER/NAME. Defaults to the repository the server is |
| 239 | /// running in. |
| 240 | #[serde(default)] |
| 241 | repo: Option<String>, |
| 242 | /// Which issues to list. Defaults to open. |
| 243 | #[serde(default)] |
| 244 | state: StateArg, |
| 245 | /// Optional substring to match against issue titles and bodies. |
| 246 | #[serde(default)] |
| 247 | query: Option<String>, |
| 248 | } |
| 249 | |
| 250 | /// Shared by the issue and pull request tools, which draw on one numbering. |
| 251 | #[derive(Debug, Deserialize, JsonSchema)] |
| 252 | struct NumberArgs { |
| 253 | /// The issue or pull request number. |
| 254 | number: i64, |
| 255 | /// Repository as OWNER/NAME. Defaults to the repository the server is |
| 256 | /// running in. |
| 257 | #[serde(default)] |
| 258 | repo: Option<String>, |
| 259 | } |
| 260 | |
| 261 | #[derive(Debug, Deserialize, JsonSchema)] |
| 262 | struct CreateIssueArgs { |
| 263 | /// Issue title. |
| 264 | title: String, |
| 265 | /// Issue body, in Markdown. |
| 266 | #[serde(default)] |
| 267 | body: Option<String>, |
| 268 | /// Repository as OWNER/NAME. Defaults to the repository the server is |
| 269 | /// running in. |
| 270 | #[serde(default)] |
| 271 | repo: Option<String>, |
| 272 | } |
| 273 | |
| 274 | #[derive(Debug, Deserialize, JsonSchema)] |
| 275 | struct AddCommentArgs { |
| 276 | /// The issue or pull request number to comment on. |
| 277 | number: i64, |
| 278 | /// Comment body, in Markdown. |
| 279 | body: String, |
| 280 | /// Repository as OWNER/NAME. Defaults to the repository the server is |
| 281 | /// running in. |
| 282 | #[serde(default)] |
| 283 | repo: Option<String>, |
| 284 | } |
| 285 | |
| 286 | #[tool_router(router = issue_router)] |
| 287 | impl SiMcpServer { |
| 288 | /// List a repository's issues, optionally filtered by state and a |
| 289 | /// title/body substring. |
| 290 | #[tool(annotations(read_only_hint = true))] |
| 291 | async fn list_issues( |
| 292 | &self, |
| 293 | Parameters(ListIssuesArgs { repo, state, query }): Parameters<ListIssuesArgs>, |
| 294 | ) -> Result<CallToolResult, ErrorData> { |
| 295 | let repo = self.repo(repo)?; |
| 296 | let issues = self |
| 297 | .client()? |
| 298 | .issues(&repo, state.into(), query.as_deref()) |
| 299 | .await |
| 300 | .map_err(to_error_data)?; |
| 301 | json_result(&issues) |
| 302 | } |
| 303 | |
| 304 | /// Fetch one issue by number, including its body and comments. |
| 305 | #[tool(annotations(read_only_hint = true))] |
| 306 | async fn get_issue( |
| 307 | &self, |
| 308 | Parameters(NumberArgs { number, repo }): Parameters<NumberArgs>, |
| 309 | ) -> Result<CallToolResult, ErrorData> { |
| 310 | let repo = self.repo(repo)?; |
| 311 | let issue = self |
| 312 | .client()? |
| 313 | .issue(&repo, number) |
| 314 | .await |
| 315 | .map_err(to_error_data)?; |
| 316 | json_result(&issue) |
| 317 | } |
| 318 | |
| 319 | /// Open a new issue. |
| 320 | #[tool] |
| 321 | async fn create_issue( |
| 322 | &self, |
| 323 | Parameters(CreateIssueArgs { title, body, repo }): Parameters<CreateIssueArgs>, |
| 324 | ) -> Result<CallToolResult, ErrorData> { |
| 325 | let repo = self.repo(repo)?; |
| 326 | let created = self |
| 327 | .client()? |
| 328 | .create_issue(&repo, &title, body.as_deref()) |
| 329 | .await |
| 330 | .map_err(to_error_data)?; |
| 331 | json_result(&created) |
| 332 | } |
| 333 | |
| 334 | /// Comment on an issue or a pull request — they share one numbering. |
| 335 | #[tool] |
| 336 | async fn add_issue_comment( |
| 337 | &self, |
| 338 | Parameters(AddCommentArgs { number, body, repo }): Parameters<AddCommentArgs>, |
| 339 | ) -> Result<CallToolResult, ErrorData> { |
| 340 | let repo = self.repo(repo)?; |
| 341 | let comment = self |
| 342 | .client()? |
| 343 | .add_comment(&repo, number, &body) |
| 344 | .await |
| 345 | .map_err(to_error_data)?; |
| 346 | json_result(&comment) |
| 347 | } |
| 348 | } |
| 349 | |
| 350 | // --------------------------------------------------------------------- pr -- |
| 351 | |
| 352 | #[derive(Debug, Deserialize, JsonSchema)] |
| 353 | struct ListPullsArgs { |
| 354 | /// Repository as OWNER/NAME. Defaults to the repository the server is |
| 355 | /// running in. |
| 356 | #[serde(default)] |
| 357 | repo: Option<String>, |
| 358 | /// Which pull requests to list. Defaults to open. |
| 359 | #[serde(default)] |
| 360 | state: StateArg, |
| 361 | } |
| 362 | |
| 363 | #[derive(Debug, Deserialize, JsonSchema)] |
| 364 | struct CreatePullArgs { |
| 365 | /// Pull request title. |
| 366 | title: String, |
| 367 | /// Branch to merge from. Defaults to the branch checked out where the |
| 368 | /// server is running. |
| 369 | #[serde(default)] |
| 370 | head: Option<String>, |
| 371 | /// Branch to merge into. Defaults to main. |
| 372 | #[serde(default)] |
| 373 | base: Option<String>, |
| 374 | /// Pull request body, in Markdown. |
| 375 | #[serde(default)] |
| 376 | body: Option<String>, |
| 377 | /// Repository as OWNER/NAME. Defaults to the repository the server is |
| 378 | /// running in. |
| 379 | #[serde(default)] |
| 380 | repo: Option<String>, |
| 381 | } |
| 382 | |
| 383 | #[tool_router(router = pr_router)] |
| 384 | impl SiMcpServer { |
| 385 | /// List a repository's pull requests, optionally filtered by state. |
| 386 | #[tool(annotations(read_only_hint = true))] |
| 387 | async fn list_pull_requests( |
| 388 | &self, |
| 389 | Parameters(ListPullsArgs { repo, state }): Parameters<ListPullsArgs>, |
| 390 | ) -> Result<CallToolResult, ErrorData> { |
| 391 | let repo = self.repo(repo)?; |
| 392 | let pulls = self |
| 393 | .client()? |
| 394 | .pulls(&repo, state.into()) |
| 395 | .await |
| 396 | .map_err(to_error_data)?; |
| 397 | json_result(&pulls) |
| 398 | } |
| 399 | |
| 400 | /// Fetch one pull request with its comments and unified diff. Diffs past |
| 401 | /// 100 kB come back truncated and flagged. |
| 402 | #[tool(annotations(read_only_hint = true))] |
| 403 | async fn get_pull_request( |
| 404 | &self, |
| 405 | Parameters(NumberArgs { number, repo }): Parameters<NumberArgs>, |
| 406 | ) -> Result<CallToolResult, ErrorData> { |
| 407 | let repo = self.repo(repo)?; |
| 408 | let pull = self |
| 409 | .client()? |
| 410 | .pull(&repo, number) |
| 411 | .await |
| 412 | .map_err(to_error_data)?; |
| 413 | json_result(&pull) |
| 414 | } |
| 415 | |
| 416 | /// Open a pull request from one branch into another. |
| 417 | #[tool] |
| 418 | async fn create_pull_request( |
| 419 | &self, |
| 420 | Parameters(CreatePullArgs { |
| 421 | title, |
| 422 | head, |
| 423 | base, |
| 424 | body, |
| 425 | repo, |
| 426 | }): Parameters<CreatePullArgs>, |
| 427 | ) -> Result<CallToolResult, ErrorData> { |
| 428 | let repo = self.repo(repo)?; |
| 429 | let head = match head { |
| 430 | Some(head) => head, |
| 431 | None => { |
| 432 | let cwd = std::env::current_dir().map_err(to_error_data)?; |
| 433 | git::current_branch(&cwd).ok_or_else(|| { |
| 434 | ErrorData::invalid_request( |
| 435 | "Could not determine the current branch. Pass `head`.", |
| 436 | None, |
| 437 | ) |
| 438 | })? |
| 439 | } |
| 440 | }; |
| 441 | let base = base.unwrap_or_else(|| "main".to_string()); |
| 442 | |
| 443 | let created = self |
| 444 | .client()? |
| 445 | .create_pull(&repo, &title, &head, &base, body.as_deref()) |
| 446 | .await |
| 447 | .map_err(to_error_data)?; |
| 448 | json_result(&created) |
| 449 | } |
| 450 | } |
| 451 | |
| 452 | // ------------------------------------------------------------------- code -- |
| 453 | |
| 454 | #[derive(Debug, Deserialize, JsonSchema)] |
| 455 | struct FileContentsArgs { |
| 456 | /// Path to the file, relative to the repository root. |
| 457 | path: String, |
| 458 | /// Branch, tag, or commit SHA. Defaults to the repository's default branch. |
| 459 | #[serde(default, rename = "ref")] |
| 460 | git_ref: Option<String>, |
| 461 | /// Repository as OWNER/NAME. Defaults to the repository the server is |
| 462 | /// running in. |
| 463 | #[serde(default)] |
| 464 | repo: Option<String>, |
| 465 | } |
| 466 | |
| 467 | #[derive(Debug, Deserialize, JsonSchema)] |
| 468 | struct SearchCodeArgs { |
| 469 | /// Fixed string to search for. Case-insensitive, not a regex. |
| 470 | query: String, |
| 471 | /// Branch, tag, or commit SHA. Defaults to the repository's default branch. |
| 472 | #[serde(default, rename = "ref")] |
| 473 | git_ref: Option<String>, |
| 474 | /// How many matches to return. |
| 475 | #[serde(default)] |
| 476 | limit: Option<u32>, |
| 477 | /// Repository as OWNER/NAME. Defaults to the repository the server is |
| 478 | /// running in. |
| 479 | #[serde(default)] |
| 480 | repo: Option<String>, |
| 481 | } |
| 482 | |
| 483 | #[tool_router(router = code_router)] |
| 484 | impl SiMcpServer { |
| 485 | /// Read a file's contents at a ref. |
| 486 | #[tool(annotations(read_only_hint = true))] |
| 487 | async fn get_file_contents( |
| 488 | &self, |
| 489 | Parameters(FileContentsArgs { |
| 490 | path, |
| 491 | git_ref, |
| 492 | repo, |
| 493 | }): Parameters<FileContentsArgs>, |
| 494 | ) -> Result<CallToolResult, ErrorData> { |
| 495 | let repo = self.repo(repo)?; |
| 496 | let file = self |
| 497 | .client()? |
| 498 | .file_contents(&repo, &path, git_ref.as_deref()) |
| 499 | .await |
| 500 | .map_err(to_error_data)?; |
| 501 | json_result(&file) |
| 502 | } |
| 503 | |
| 504 | /// Search a repository's tracked files for a fixed string, returning |
| 505 | /// matching files with line snippets. |
| 506 | #[tool(annotations(read_only_hint = true))] |
| 507 | async fn search_code( |
| 508 | &self, |
| 509 | Parameters(SearchCodeArgs { |
| 510 | query, |
| 511 | git_ref, |
| 512 | limit, |
| 513 | repo, |
| 514 | }): Parameters<SearchCodeArgs>, |
| 515 | ) -> Result<CallToolResult, ErrorData> { |
| 516 | let repo = self.repo(repo)?; |
| 517 | let hits = self |
| 518 | .client()? |
| 519 | .search_code(&repo, &query, git_ref.as_deref(), limit) |
| 520 | .await |
| 521 | .map_err(to_error_data)?; |
| 522 | json_result(&hits) |
| 523 | } |
| 524 | } |
| 525 | |
| 526 | // ------------------------------------------------------------------- hook -- |
| 527 | |
| 528 | #[derive(Debug, Deserialize, JsonSchema)] |
| 529 | struct CreateHookArgs { |
| 530 | /// URL sigit.si should POST to. |
| 531 | url: String, |
| 532 | /// Events to subscribe to. Defaults to push. |
| 533 | #[serde(default)] |
| 534 | events: Option<Vec<String>>, |
| 535 | /// Repository as OWNER/NAME. Defaults to the repository the server is |
| 536 | /// running in. |
| 537 | #[serde(default)] |
| 538 | repo: Option<String>, |
| 539 | } |
| 540 | |
| 541 | #[derive(Debug, Deserialize, JsonSchema)] |
| 542 | struct DeleteHookArgs { |
| 543 | /// The webhook's id. |
| 544 | id: i64, |
| 545 | /// Repository as OWNER/NAME. Defaults to the repository the server is |
| 546 | /// running in. |
| 547 | #[serde(default)] |
| 548 | repo: Option<String>, |
| 549 | } |
| 550 | |
| 551 | #[tool_router(router = hook_router)] |
| 552 | impl SiMcpServer { |
| 553 | /// List a repository's deploy webhooks. |
| 554 | #[tool(annotations(read_only_hint = true))] |
| 555 | async fn list_hooks( |
| 556 | &self, |
| 557 | Parameters(RepoArgs { repo }): Parameters<RepoArgs>, |
| 558 | ) -> Result<CallToolResult, ErrorData> { |
| 559 | let slug = self.slug(repo)?; |
| 560 | let hooks = self |
| 561 | .client()? |
| 562 | .hooks(&slug.owner, &slug.name) |
| 563 | .await |
| 564 | .map_err(to_error_data)?; |
| 565 | json_result(&hooks) |
| 566 | } |
| 567 | |
| 568 | /// Register a webhook. The response carries the signing secret, which is |
| 569 | /// shown once and cannot be retrieved again. |
| 570 | #[tool] |
| 571 | async fn create_hook( |
| 572 | &self, |
| 573 | Parameters(CreateHookArgs { url, events, repo }): Parameters<CreateHookArgs>, |
| 574 | ) -> Result<CallToolResult, ErrorData> { |
| 575 | let slug = self.slug(repo)?; |
| 576 | let events = events.unwrap_or_else(|| vec!["push".to_string()]); |
| 577 | let hook = self |
| 578 | .client()? |
| 579 | .create_hook(&slug.owner, &slug.name, &url, &events) |
| 580 | .await |
| 581 | .map_err(to_error_data)?; |
| 582 | json_result(&hook) |
| 583 | } |
| 584 | |
| 585 | /// Remove a webhook. This cannot be undone. |
| 586 | #[tool(annotations(destructive_hint = true))] |
| 587 | async fn delete_hook( |
| 588 | &self, |
| 589 | Parameters(DeleteHookArgs { id, repo }): Parameters<DeleteHookArgs>, |
| 590 | ) -> Result<CallToolResult, ErrorData> { |
| 591 | let slug = self.slug(repo)?; |
| 592 | self.client()? |
| 593 | .delete_hook(&slug.owner, &slug.name, id) |
| 594 | .await |
| 595 | .map_err(to_error_data)?; |
| 596 | text_result(format!("Deleted webhook {id} from {slug}.")) |
| 597 | } |
| 598 | } |
| 599 | |
| 600 | // ---------------------------------------------------------------- session -- |
| 601 | |
| 602 | #[derive(Debug, Deserialize, JsonSchema)] |
| 603 | struct SessionIdArgs { |
| 604 | /// The Cloud Session's id. |
| 605 | id: i64, |
| 606 | } |
| 607 | |
| 608 | #[derive(Debug, Deserialize, JsonSchema)] |
| 609 | struct CreateSessionArgs { |
| 610 | /// Title for the session. |
| 611 | #[serde(default)] |
| 612 | title: Option<String>, |
| 613 | /// Model the session runs on. Defaults to the account's default. |
| 614 | #[serde(default)] |
| 615 | model: Option<String>, |
| 616 | } |
| 617 | |
| 618 | #[derive(Debug, Deserialize, JsonSchema)] |
| 619 | struct UpdateSessionArgs { |
| 620 | /// The Cloud Session's id. |
| 621 | id: i64, |
| 622 | /// New title. Omit to leave unchanged. |
| 623 | #[serde(default)] |
| 624 | title: Option<String>, |
| 625 | /// New model. Omit to leave unchanged. |
| 626 | #[serde(default)] |
| 627 | model: Option<String>, |
| 628 | } |
| 629 | |
| 630 | #[derive(Debug, Deserialize, JsonSchema)] |
| 631 | struct AppendMessageArgs { |
| 632 | /// The Cloud Session's id. |
| 633 | id: i64, |
| 634 | /// Who the message is from: user or assistant. |
| 635 | role: String, |
| 636 | /// The message text. |
| 637 | content: String, |
| 638 | } |
| 639 | |
| 640 | #[tool_router(router = session_router)] |
| 641 | impl SiMcpServer { |
| 642 | /// List siGit Code Cloud Sessions, most recently updated first. |
| 643 | #[tool(annotations(read_only_hint = true))] |
| 644 | async fn list_sessions(&self) -> Result<CallToolResult, ErrorData> { |
| 645 | let sessions = self.client()?.sessions().await.map_err(to_error_data)?; |
| 646 | json_result(&sessions) |
| 647 | } |
| 648 | |
| 649 | /// Fetch one Cloud Session with its full transcript. |
| 650 | #[tool(annotations(read_only_hint = true))] |
| 651 | async fn get_session( |
| 652 | &self, |
| 653 | Parameters(SessionIdArgs { id }): Parameters<SessionIdArgs>, |
| 654 | ) -> Result<CallToolResult, ErrorData> { |
| 655 | let session = self.client()?.session(id).await.map_err(to_error_data)?; |
| 656 | json_result(&session) |
| 657 | } |
| 658 | |
| 659 | /// Start a new Cloud Session. |
| 660 | #[tool] |
| 661 | async fn create_session( |
| 662 | &self, |
| 663 | Parameters(CreateSessionArgs { title, model }): Parameters<CreateSessionArgs>, |
| 664 | ) -> Result<CallToolResult, ErrorData> { |
| 665 | let session = self |
| 666 | .client()? |
| 667 | .create_session(title.as_deref(), model.as_deref()) |
| 668 | .await |
| 669 | .map_err(to_error_data)?; |
| 670 | json_result(&session) |
| 671 | } |
| 672 | |
| 673 | /// Rename a Cloud Session or change the model it runs on. |
| 674 | #[tool] |
| 675 | async fn update_session( |
| 676 | &self, |
| 677 | Parameters(UpdateSessionArgs { id, title, model }): Parameters<UpdateSessionArgs>, |
| 678 | ) -> Result<CallToolResult, ErrorData> { |
| 679 | let session = self |
| 680 | .client()? |
| 681 | .update_session(id, title.as_deref(), model.as_deref()) |
| 682 | .await |
| 683 | .map_err(to_error_data)?; |
| 684 | json_result(&session) |
| 685 | } |
| 686 | |
| 687 | /// Append one message to a Cloud Session's transcript. |
| 688 | #[tool] |
| 689 | async fn append_session_message( |
| 690 | &self, |
| 691 | Parameters(AppendMessageArgs { id, role, content }): Parameters<AppendMessageArgs>, |
| 692 | ) -> Result<CallToolResult, ErrorData> { |
| 693 | let appended = self |
| 694 | .client()? |
| 695 | .append_message(id, &role, &content) |
| 696 | .await |
| 697 | .map_err(to_error_data)?; |
| 698 | json_result(&appended) |
| 699 | } |
| 700 | |
| 701 | /// Delete a Cloud Session and its transcript. This cannot be undone. |
| 702 | #[tool(annotations(destructive_hint = true))] |
| 703 | async fn delete_session( |
| 704 | &self, |
| 705 | Parameters(SessionIdArgs { id }): Parameters<SessionIdArgs>, |
| 706 | ) -> Result<CallToolResult, ErrorData> { |
| 707 | self.client()? |
| 708 | .delete_session(id) |
| 709 | .await |
| 710 | .map_err(to_error_data)?; |
| 711 | text_result(format!("Deleted session {id}.")) |
| 712 | } |
| 713 | } |
| 714 | |
| 715 | // ---------------------------------------------------------------- billing -- |
| 716 | |
| 717 | #[tool_router(router = billing_router)] |
| 718 | impl SiMcpServer { |
| 719 | /// Show the account's current plan and cloud usage. |
| 720 | #[tool(annotations(read_only_hint = true))] |
| 721 | async fn get_billing(&self) -> Result<CallToolResult, ErrorData> { |
| 722 | let billing = self.client()?.billing().await.map_err(to_error_data)?; |
| 723 | json_result(&billing) |
| 724 | } |
| 725 | } |
| 726 | |
| 727 | #[tool_handler(router = self.tool_router)] |
| 728 | impl ServerHandler for SiMcpServer { |
| 729 | fn get_info(&self) -> ServerInfo { |
| 730 | // `Implementation` is `#[non_exhaustive]`, so start from the build-env |
| 731 | // default and override the identity fields to report `si`, not `rmcp`. |
| 732 | let mut server_info = Implementation::from_build_env(); |
| 733 | server_info.name = "si".to_string(); |
| 734 | server_info.version = env!("CARGO_PKG_VERSION").to_string(); |
| 735 | |
| 736 | ServerInfo::new(ServerCapabilities::builder().enable_tools().build()) |
| 737 | .with_server_info(server_info) |
| 738 | .with_instructions( |
| 739 | "The sigit.si CLI exposed as MCP tools. Authentication uses the token stored \ |
| 740 | by `si auth login`; tools run non-interactively. Every repository tool takes \ |
| 741 | `repo` as OWNER/NAME, and omitting it falls back to the sigit.si repository \ |
| 742 | the server was started in — call `current_repository` to see what that \ |
| 743 | resolves to. Use `list_repositories` to find the OWNER/NAME of anything else.", |
| 744 | ) |
| 745 | } |
| 746 | } |
| 747 | |
| 748 | impl SiMcpServer { |
| 749 | /// [`Self::repo`], parsed back into its owner and name halves for the REST |
| 750 | /// endpoints that take them separately. |
| 751 | fn slug(&self, explicit: Option<String>) -> Result<RepoSlug, ErrorData> { |
| 752 | self.ctx |
| 753 | .resolve_repo(explicit) |
| 754 | .map_err(|e| ErrorData::invalid_request(e.to_string(), None)) |
| 755 | } |
| 756 | } |
| 757 | |
| 758 | /// Assemble the router from the requested toolsets, then drop the writers if |
| 759 | /// `--read-only` was passed. |
| 760 | /// |
| 761 | /// An unknown toolset name is an error rather than a silent no-op: a typo in an |
| 762 | /// editor's config would otherwise show up as a server that mysteriously |
| 763 | /// offers fewer tools than expected. |
| 764 | fn build_router(toolsets: &[String], read_only: bool) -> Result<ToolRouter<SiMcpServer>> { |
| 765 | let selected: Vec<String> = if toolsets.is_empty() { |
| 766 | TOOLSETS.iter().map(|name| name.to_string()).collect() |
| 767 | } else { |
| 768 | toolsets |
| 769 | .iter() |
| 770 | .map(|name| name.trim().to_ascii_lowercase()) |
| 771 | .collect() |
| 772 | }; |
| 773 | |
| 774 | let mut router = ToolRouter::new(); |
| 775 | for name in &selected { |
| 776 | let group = match name.as_str() { |
| 777 | "account" => SiMcpServer::account_router(), |
| 778 | "repo" => SiMcpServer::repo_router(), |
| 779 | "issue" => SiMcpServer::issue_router(), |
| 780 | "pr" => SiMcpServer::pr_router(), |
| 781 | "code" => SiMcpServer::code_router(), |
| 782 | "hook" => SiMcpServer::hook_router(), |
| 783 | "session" => SiMcpServer::session_router(), |
| 784 | "billing" => SiMcpServer::billing_router(), |
| 785 | other => { |
| 786 | return Err(anyhow!( |
| 787 | "Unknown toolset {other:?}. Expected one of: {}.", |
| 788 | TOOLSETS.join(", ") |
| 789 | )) |
| 790 | } |
| 791 | }; |
| 792 | router.merge(group); |
| 793 | } |
| 794 | |
| 795 | if read_only { |
| 796 | let writers: Vec<String> = router |
| 797 | .list_all() |
| 798 | .into_iter() |
| 799 | .filter(|tool| { |
| 800 | tool.annotations |
| 801 | .as_ref() |
| 802 | .and_then(|annotations| annotations.read_only_hint) |
| 803 | != Some(true) |
| 804 | }) |
| 805 | .map(|tool| tool.name.to_string()) |
| 806 | .collect(); |
| 807 | |
| 808 | for name in writers { |
| 809 | router.remove_route(&name); |
| 810 | } |
| 811 | } |
| 812 | |
| 813 | Ok(router) |
| 814 | } |
| 815 | |
| 816 | /// Run the MCP server over stdio until the client disconnects. |
| 817 | pub async fn run(ctx: Ctx, args: McpArgs) -> Result<()> { |
| 818 | let router = build_router(&args.toolsets, args.read_only)?; |
| 819 | tracing::info!(tools = router.list_all().len(), "starting the MCP server"); |
| 820 | |
| 821 | let running = SiMcpServer::new(ctx, router) |
| 822 | .serve(stdio()) |
| 823 | .await |
| 824 | .map_err(|e| anyhow!("Could not start the MCP server: {e}"))?; |
| 825 | |
| 826 | running |
| 827 | .waiting() |
| 828 | .await |
| 829 | .map_err(|e| anyhow!("The MCP server stopped unexpectedly: {e}"))?; |
| 830 | Ok(()) |
| 831 | } |
| 832 | |
| 833 | #[cfg(test)] |
| 834 | mod tests { |
| 835 | use super::*; |
| 836 | |
| 837 | fn tool_names(toolsets: &[String], read_only: bool) -> Vec<String> { |
| 838 | build_router(toolsets, read_only) |
| 839 | .unwrap() |
| 840 | .list_all() |
| 841 | .into_iter() |
| 842 | .map(|tool| tool.name.to_string()) |
| 843 | .collect() |
| 844 | } |
| 845 | |
| 846 | #[test] |
| 847 | fn the_default_router_spans_every_toolset() { |
| 848 | let names = tool_names(&[], false); |
| 849 | |
| 850 | for expected in [ |
| 851 | "whoami", |
| 852 | "list_repositories", |
| 853 | "list_issues", |
| 854 | "list_pull_requests", |
| 855 | "search_code", |
| 856 | "list_hooks", |
| 857 | "list_sessions", |
| 858 | "get_billing", |
| 859 | ] { |
| 860 | assert!( |
| 861 | names.contains(&expected.to_string()), |
| 862 | "missing {expected:?}" |
| 863 | ); |
| 864 | } |
| 865 | } |
| 866 | |
| 867 | #[test] |
| 868 | fn a_toolset_selection_leaves_the_rest_out() { |
| 869 | let names = tool_names(&["issue".to_string(), "pr".to_string()], false); |
| 870 | |
| 871 | assert!(names.contains(&"create_issue".to_string())); |
| 872 | assert!(names.contains(&"get_pull_request".to_string())); |
| 873 | assert!(!names.contains(&"get_billing".to_string())); |
| 874 | assert!(!names.contains(&"list_sessions".to_string())); |
| 875 | } |
| 876 | |
| 877 | #[test] |
| 878 | fn read_only_mode_drops_every_writer() { |
| 879 | let names = tool_names(&[], true); |
| 880 | |
| 881 | assert!(names.contains(&"list_issues".to_string())); |
| 882 | assert!(names.contains(&"get_file_contents".to_string())); |
| 883 | |
| 884 | for writer in [ |
| 885 | "create_issue", |
| 886 | "create_pull_request", |
| 887 | "add_issue_comment", |
| 888 | "create_repository", |
| 889 | "create_hook", |
| 890 | "delete_hook", |
| 891 | "create_session", |
| 892 | "delete_session", |
| 893 | ] { |
| 894 | assert!( |
| 895 | !names.contains(&writer.to_string()), |
| 896 | "read-only mode should have dropped {writer:?}" |
| 897 | ); |
| 898 | } |
| 899 | } |
| 900 | |
| 901 | #[test] |
| 902 | fn an_unknown_toolset_is_rejected() { |
| 903 | let error = build_router(&["repo".to_string(), "nope".to_string()], false).unwrap_err(); |
| 904 | assert!(error.to_string().contains("nope")); |
| 905 | } |
| 906 | |
| 907 | #[test] |
| 908 | fn toolset_names_are_case_and_space_insensitive() { |
| 909 | assert_eq!( |
| 910 | tool_names(&[" Billing ".to_string()], false), |
| 911 | vec!["get_billing".to_string()] |
| 912 | ); |
| 913 | } |
| 914 | } |