feat(lanes): record which CLI tool drives a lane

server/__tests__/lanes-lib.test.js

@@ -236,6 +236,27 @@ describe("lanes lib", () => {
     assert.equal(p.pipeline_skill, "/ccam:ship-feature");
     lanes.deleteLane(l.id);
   });
+
+  it("createLane defaults tool to claude and accepts codex", () => {
+    const a = lanes.createLane({ cwd: "/tmp/tool-default" });
+    assert.equal(a.tool, "claude");
+    const b = lanes.createLane({ cwd: "/tmp/tool-codex", tool: "codex" });
+    assert.equal(b.tool, "codex");
+  });
+
+  it("createLane rejects an unknown tool", () => {
+    assert.throws(
+      () => lanes.createLane({ cwd: "/tmp/tool-bad", tool: "cursor" }),
+      (err) => err.code === "EBADTOOL"
+    );
+  });
+
+  it("updateLane never writes tool (immutable per lane)", () => {
+    const lane = lanes.createLane({ cwd: "/tmp/tool-immutable", tool: "codex" });
+    const after = lanes.updateLane(lane.id, { tool: "claude", title: "x" });
+    assert.equal(after.tool, "codex");
+    assert.equal(after.title, "x");
+  });
 });
 
 const { withLaneLock } = require("../lib/lane-lock");

server/db.js

@@ -486,6 +486,22 @@ try {
   db.prepare("ALTER TABLE lanes ADD COLUMN slug TEXT").run();
 }
 
+// Migrate: which CLI drives this lane — `claude` (default) or `codex`. Additive
+// with a default, so every existing lane keeps today's behavior. A lane's tool
+// is immutable (never in PATCHABLE): the tmux pane, the run history and the
+// binary probe all key off it, so flipping it under a live pane would describe
+// a run that isn't what's actually attached.
+try {
+  db.prepare("SELECT tool FROM lanes LIMIT 1").get();
+} catch {
+  db.prepare("ALTER TABLE lanes ADD COLUMN tool TEXT NOT NULL DEFAULT 'claude'").run();
+}
+try {
+  db.prepare("SELECT tool FROM dashboard_runs LIMIT 1").get();
+} catch {
+  db.prepare("ALTER TABLE dashboard_runs ADD COLUMN tool TEXT NOT NULL DEFAULT 'claude'").run();
+}
+
 // Migrate: label a dashboard run with the lane it was started through, so the
 // Workspace page can show one lane's run history. Additive and nullable —
 // POST /api/run keeps writing rows with no lane. One probe for the one column.

server/lib/dashboard-runs.js

@@ -25,11 +25,11 @@ const insertStmt = db.prepare(`
   INSERT OR REPLACE INTO dashboard_runs (
     id, session_id, mode, cwd, model, permission_mode, effort,
     resume_session_id, prompt_preview, status, exit_code, started_at, ended_at,
-    lane_id
+    lane_id, tool
   ) VALUES (
     @id, @session_id, @mode, @cwd, @model, @permission_mode, @effort,
     @resume_session_id, @prompt_preview, @status, @exit_code, @started_at, @ended_at,
-    @lane_id
+    @lane_id, @tool
   )
 `);
 
@@ -44,7 +44,7 @@ const updateStmt = db.prepare(`
 
 const RUN_COLUMNS = `id, session_id, mode, cwd, model, permission_mode, effort,
          resume_session_id, prompt_preview, status, exit_code,
-         started_at, ended_at, lane_id`;
+         started_at, ended_at, lane_id, tool`;
 
 const listStmt = db.prepare(`
   SELECT ${RUN_COLUMNS}
@@ -89,6 +89,7 @@ function recordRun(handle) {
       started_at: startedAt,
       ended_at: endedAt,
       lane_id: typeof handle.laneId === "number" ? handle.laneId : null,
+      tool: handle.tool === "codex" ? "codex" : "claude",
     });
   } catch {
     /* persistence is best-effort */

server/lib/lanes.js

@@ -95,6 +95,14 @@ function validateKind(kind) {
   }
 }
 
+const VALID_TOOLS = new Set(["claude", "codex"]);
+
+function validateTool(tool) {
+  if (!VALID_TOOLS.has(tool)) {
+    throw Object.assign(new Error(`unknown tool: ${tool}`), { code: "EBADTOOL" });
+  }
+}
+
 /**
  * `getPipeline` falls back to the default template for an unknown id — correct
  * when READING (a lane must always render something), wrong when WRITING: a
@@ -139,15 +147,17 @@ function createLane({
   source_repo = null,
   base_branch = null,
   slug = null,
+  tool = "claude",
 } = {}) {
   if (!cwd || typeof cwd !== "string" || !cwd.startsWith("/")) {
     throw Object.assign(new Error("cwd must be an absolute path"), { code: "EBADCWD" });
   }
   validateKind(kind);
   validatePipeline(pipeline);
+  validateTool(tool);
   const info = db
     .prepare(
-      "INSERT INTO lanes (title, cwd, branch, pipeline, kind, source_repo, base_branch, slug, stage_since) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)"
+      "INSERT INTO lanes (title, cwd, branch, pipeline, kind, source_repo, base_branch, slug, tool, stage_since) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)"
     )
     .run(
       title,
@@ -158,6 +168,7 @@ function createLane({
       source_repo,
       base_branch,
       slug,
+      tool,
       nowIso()
     );
   return getLane(info.lastInsertRowid);
@@ -599,6 +610,7 @@ function purgeLaneSessions(laneId) {
 
 module.exports = {
   DEAD_SEC,
+  VALID_TOOLS,
   createLane,
   listLanes,
   getLane,