diff --git a/src/features/team-mode/team-registry/paths.test.ts b/src/features/team-mode/team-registry/paths.test.ts
new file mode 100644
index 000000000..c2262eed1
--- /dev/null
+++ b/src/features/team-mode/team-registry/paths.test.ts
@@ -0,0 +1,119 @@
+/// <reference types="bun-types" />
+
+import { afterEach, describe, expect, mock, test } from "bun:test"
+import { mkdtemp, mkdir, rm, stat, writeFile } from "node:fs/promises"
+import { homedir, tmpdir } from "node:os"
+import path from "node:path"
+import { randomUUID } from "node:crypto"
+
+import { TeamModeConfigSchema } from "../../../config/schema/team-mode"
+
+const logCalls: Array<[string, unknown?]> = []
+
+mock.module("../../../shared/logger", () => ({
+  log: (message: string, data?: unknown) => {
+    logCalls.push([message, data])
+  },
+}))
+
+const { discoverTeamSpecs, ensureBaseDirs, resolveBaseDir } = await import("./paths")
+
+async function createTemporaryRoot(): Promise<string> {
+  return await mkdtemp(path.join(tmpdir(), "team-mode-paths-"))
+}
+
+describe("paths", () => {
+  const temporaryDirectories: string[] = []
+
+  afterEach(async () => {
+    logCalls.splice(0)
+    await Promise.all(temporaryDirectories.splice(0).map(async (directoryPath) => {
+      await rm(directoryPath, { recursive: true, force: true })
+    }))
+  })
+
+  test("resolveBaseDir defaults to ~/.omo", () => {
+    // given
+    const config = TeamModeConfigSchema.parse({ base_dir: undefined })
+
+    // when
+    const resolvedBaseDir = resolveBaseDir(config)
+
+    // then
+    expect(resolvedBaseDir).toBe(path.join(homedir(), ".omo"))
+  })
+
+  test("resolveBaseDir honors override", () => {
+    // given
+    const config = TeamModeConfigSchema.parse({ base_dir: "/tmp/test-abc" })
+
+    // when
+    const resolvedBaseDir = resolveBaseDir(config)
+
+    // then
+    expect(resolvedBaseDir).toBe("/tmp/test-abc")
+  })
+
+  test("discoverTeamSpecs prefers project scope", async () => {
+    // given
+    const rootDirectory = await createTemporaryRoot()
+    temporaryDirectories.push(rootDirectory)
+
+    const projectRoot = path.join(rootDirectory, "project")
+    const userBaseDir = path.join(rootDirectory, "home", ".omo")
+    const projectTeamDir = path.join(projectRoot, ".omo", "teams", "foo")
+    const userTeamDir = path.join(userBaseDir, "teams", "foo")
+
+    await mkdir(projectTeamDir, { recursive: true })
+    await mkdir(userTeamDir, { recursive: true })
+
+    await writeFile(path.join(projectTeamDir, "config.json"), "{}")
+    await writeFile(path.join(userTeamDir, "config.json"), "{}")
+
+    // when
+    const teamSpecs = await discoverTeamSpecs(TeamModeConfigSchema.parse({ base_dir: userBaseDir }), projectRoot)
+
+    // then
+    expect(teamSpecs).toEqual([
+      {
+        name: "foo",
+        scope: "project",
+        path: path.join(projectTeamDir, "config.json"),
+      },
+    ])
+    expect(logCalls).toEqual([
+      [
+        "team-spec collision",
+        {
+          event: "team-spec-collision",
+          teamName: "foo",
+          projectPath: path.join(projectTeamDir, "config.json"),
+          userPath: path.join(userTeamDir, "config.json"),
+        },
+      ],
+    ])
+  })
+
+  test("ensureBaseDirs creates all dirs with mode 0700", async () => {
+    // given
+    const baseDir = path.join(tmpdir(), `omo-test-${randomUUID()}`)
+
+    // when
+    await ensureBaseDirs(baseDir)
+    await ensureBaseDirs(baseDir)
+
+    // then
+    const directoryPaths = [
+      baseDir,
+      path.join(baseDir, "teams"),
+      path.join(baseDir, "runtime"),
+      path.join(baseDir, "worktrees"),
+    ]
+
+    for (const directoryPath of directoryPaths) {
+      const directoryStat = await stat(directoryPath)
+      expect(directoryStat.isDirectory()).toBe(true)
+      expect(directoryStat.mode & 0o777).toBe(0o700)
+    }
+  })
+})
diff --git a/src/features/team-mode/team-registry/paths.ts b/src/features/team-mode/team-registry/paths.ts
new file mode 100644
index 000000000..c80032575
--- /dev/null
+++ b/src/features/team-mode/team-registry/paths.ts
@@ -0,0 +1,122 @@
+import { mkdir, readdir, stat, chmod } from "node:fs/promises"
+import { homedir } from "node:os"
+import path from "node:path"
+
+import type { TeamModeConfig } from "../../../config/schema/team-mode"
+import { log } from "../../../shared/logger"
+
+type TeamSpecEntry = {
+  name: string
+  scope: "project" | "user"
+  path: string
+}
+
+function getTeamDirectory(baseDir: string, teamName: string, scope: "user" | "project", projectRoot?: string): string {
+  if (scope === "project") {
+    return path.join(projectRoot ?? "", ".omo", "teams", teamName)
+  }
+
+  return path.join(baseDir, "teams", teamName)
+}
+
+export function resolveBaseDir(config: TeamModeConfig): string {
+  return config.base_dir ?? path.join(homedir(), ".omo")
+}
+
+export function getTeamSpecPath(
+  baseDir: string,
+  teamName: string,
+  scope: "user" | "project",
+  projectRoot?: string,
+): string {
+  return path.join(getTeamDirectory(baseDir, teamName, scope, projectRoot), "config.json")
+}
+
+export function getRuntimeStateDir(baseDir: string, teamRunId: string): string {
+  return path.join(baseDir, "runtime", teamRunId)
+}
+
+export function getInboxDir(baseDir: string, teamRunId: string, memberName: string): string {
+  return path.join(baseDir, "runtime", teamRunId, "inboxes", memberName)
+}
+
+export function getTasksDir(baseDir: string, teamRunId: string): string {
+  return path.join(baseDir, "runtime", teamRunId, "tasks")
+}
+
+export function getWorktreeDir(baseDir: string, teamRunId: string, memberName: string): string {
+  return path.join(baseDir, "worktrees", teamRunId, memberName)
+}
+
+async function readTeamSpecDirectories(directoryPath: string, scope: "project" | "user"): Promise<TeamSpecEntry[]> {
+  try {
+    const entries = await readdir(directoryPath, { withFileTypes: true })
+
+    return entries
+      .filter((entry) => entry.isDirectory())
+      .map((entry) => ({
+        name: entry.name,
+        scope,
+        path: path.resolve(directoryPath, entry.name, "config.json"),
+      }))
+  } catch {
+    return []
+  }
+}
+
+export async function discoverTeamSpecs(
+  config: TeamModeConfig,
+  projectRoot: string,
+): Promise<Array<{ name: string; scope: "project" | "user"; path: string }>> {
+  const baseDir = resolveBaseDir(config)
+  const projectTeamsDir = path.resolve(projectRoot, ".omo", "teams")
+  const userTeamsDir = path.resolve(baseDir, "teams")
+
+  const [projectTeamSpecs, userTeamSpecs] = await Promise.all([
+    readTeamSpecDirectories(projectTeamsDir, "project"),
+    readTeamSpecDirectories(userTeamsDir, "user"),
+  ])
+
+  const discoveredTeamSpecs: TeamSpecEntry[] = [...projectTeamSpecs]
+  const projectTeamNames = new Set(projectTeamSpecs.map((entry) => entry.name))
+
+  for (const userTeamSpec of userTeamSpecs) {
+    if (projectTeamNames.has(userTeamSpec.name)) {
+      const projectTeamSpec = projectTeamSpecs.find((entry) => entry.name === userTeamSpec.name)
+      if (projectTeamSpec) {
+        log("team-spec collision", {
+          event: "team-spec-collision",
+          teamName: userTeamSpec.name,
+          projectPath: projectTeamSpec.path,
+          userPath: userTeamSpec.path,
+        })
+      }
+      continue
+    }
+
+    discoveredTeamSpecs.push(userTeamSpec)
+  }
+
+  return discoveredTeamSpecs
+}
+
+export async function ensureBaseDirs(baseDir: string): Promise<void> {
+  const directories = [
+    baseDir,
+    path.join(baseDir, "teams"),
+    path.join(baseDir, "runtime"),
+    path.join(baseDir, "worktrees"),
+  ]
+
+  for (const directoryPath of directories) {
+    await mkdir(directoryPath, { recursive: true, mode: 0o700 })
+    await chmod(directoryPath, 0o700)
+  }
+
+  await Promise.all(directories.map(async (directoryPath) => {
+    const directoryStat = await stat(directoryPath)
+    if ((directoryStat.mode & 0o777) !== 0o700) {
+      await chmod(directoryPath, 0o700)
+    }
+  }))
+}