diff --git a/README.md b/README.md
index 4de17a5..f7dee8e 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@ Grok Build, Codex, Cursor, Merlin, corvid-agent, private runners).
 ```bash
 let where .                         # what agent stuff is here?
 let find worktrees --json           # .claude/worktrees + ~/.codex + git + …
-let find skills --json              # Claude + Grok + Cursor + agent.3md planes
+let find skills --json              # Claude + Grok + Cursor + OpenAI + agent.3md planes
 let find agents --json              # agent.3md + host agent dirs
 let find memory --json              # memtrace / codex / gemini / .let (path-only)
 let find sessions --json            # all hosts, path-only
@@ -36,14 +36,14 @@ let web                              # local, read-only Fleet dashboard
 
 - **The let standard** — one closed kind set for every host; cards first, bodies on demand
 - **Worktrees** — git seed + Claude / Codex / Cursor / project / Grok DB, deduped by realpath
-- **Skills** — Claude, Grok, Cursor, Codex, let catalogs + **agent.3md skill planes**
+- **Skills** — Claude, Grok, Cursor, Codex, OpenAI, let catalogs + **agent.3md skill planes**
 - **Agents** — agent.3md / `*.3md` first-class + Claude/Codex/Cursor/Grok/Gemini/Kimi roots
 - **Commands** — Claude + Cursor slash-commands (project + user)
 - **Sessions / memory** — path-only federation (Claude, Grok, Codex, Cursor, Gemini, Kimi)
 - **Plugins / MCP / tasks** — Claude plugins & tasks, Cursor plans, MCP configs across hosts
 - **Workflows / superskills** — let-native + Grok workflow roots when present
 - **Show / open / route** — progressive bodies + agent.3md-first skill ranking
-- **Hosts** — Claude, Codex, Cursor, Grok, Gemini, Kimi Code, agent.3md, let
+- **Hosts** — Claude, Codex, Cursor, Grok, OpenAI, Gemini, Kimi Code, agent.3md, let
 - **Dogfood** — ships `agent.3md` and can find + show + route itself
 - **JSON-first** — stable envelopes for agents (`--json`)
 
diff --git a/docs/dogfood.md b/docs/dogfood.md
index 5262c89..ac39a42 100644
--- a/docs/dogfood.md
+++ b/docs/dogfood.md
@@ -29,7 +29,7 @@ let show skill <id> --json    # load body / tool template
 ## Multi-host on this machine
 
 ```bash
-let doctor --json                          # roots for claude/codex/cursor/grok/gemini/kimi
+let doctor --json                          # roots for claude/codex/cursor/grok/openai/gemini/kimi
 let find sessions --host kimi --scope user --json
 let find sessions --host gemini --scope user --json
 let find agents --json                     # agent3md + claude/codex + gemini
diff --git a/docs/usage.md b/docs/usage.md
index de8136c..8054f38 100644
--- a/docs/usage.md
+++ b/docs/usage.md
@@ -119,7 +119,7 @@ let find instructions --json
 Kinds: `instructions`, `skills`, `agents`, `commands`, `worktrees`, `sessions`,
 `tasks`, `memory`, `mcp`, `plugins`, `workflows`, `superskills`.
 
-Hosts (`--host`): `claude`, `grok`, `codex`, `cursor`, `gemini`, `kimi`,
+Hosts (`--host`): `claude`, `grok`, `codex`, `cursor`, `openai`, `gemini`, `kimi`,
 `agent3md`, `git`, `project`, `let`, …
 
 ### Host × kind matrix
@@ -130,6 +130,7 @@ Hosts (`--host`): `claude`, `grok`, `codex`, `cursor`, `gemini`, `kimi`,
 | grok | worktrees.db | yes | bundled | — | path-only | memtrace | — | — | — |
 | codex | yes | optional | yes | — | path-only | sqlite/dir | yes | config path | — |
 | cursor | weak | yes | yes | yes | chats path | — | — | mcp.json | plans |
+| openai | — | yes | — | — | — | — | — | — | — |
 | gemini | — | — | antigravity | — | history path | brain/knowledge | — | mcp_config | — |
 | kimi | — | — | config path | — | workspaces path | user-history | — | — | — |
 | agent3md | — | skill planes | agent.3md | — | — | — | — | — | — |
diff --git a/specs/catalog/catalog.spec.md b/specs/catalog/catalog.spec.md
index 06a7647..95a3ebf 100644
--- a/specs/catalog/catalog.spec.md
+++ b/specs/catalog/catalog.spec.md
@@ -1,6 +1,6 @@
 ---
 module: catalog
-version: 1
+version: 4
 status: active
 files:
   - src/catalog/types.ts
@@ -49,7 +49,7 @@ Context packs never include session paths or bodies.
 
 | Export | Description |
 |--------|-------------|
-| `HostId` | Host attribution id (claude, grok, codex, cursor, gemini, kimi, git, project, corvid, let, agent3md, unknown). |
+| `HostId` | Host attribution id (claude, grok, codex, cursor, openai, gemini, kimi, git, project, corvid, let, agent3md, unknown). |
 | `FindKind` | Closed catalog kind union for find/show. |
 | `FIND_KINDS` | Runtime list of all FindKind values. |
 | `FindScope` | project \| user \| all. |
@@ -115,7 +115,7 @@ Context packs never include session paths or bodies.
 | `pathCardId` | Document caller-visible behavior and constraints. |
 | `inRepoWorktreeBases` | Document caller-visible behavior and constraints. |
 | `externalWorktreeRoots` | Document caller-visible behavior and constraints. |
-| `skillRoots` | Document caller-visible behavior and constraints. |
+| `skillRoots` | Fixed project and user skill catalog roots, including `.openai/skills`; user roots obey `include_user_skills`. |
 | `isDeniedBasename` | Document caller-visible behavior and constraints. |
 | `MAX_BODY_BYTES` | Document caller-visible behavior and constraints. |
 | `MAX_OPEN_PREVIEW_BYTES` | Document caller-visible behavior and constraints. |
@@ -155,7 +155,7 @@ Context packs never include session paths or bodies.
 
 | Export | Description |
 |--------|-------------|
-| `HostId` | claude, grok, codex, cursor, gemini, kimi, git, project, corvid, let, agent3md, unknown. |
+| `HostId` | claude, grok, codex, cursor, openai, gemini, kimi, git, project, corvid, let, agent3md, unknown. |
 | `FindKind` | Closed catalog kinds (worktrees, skills, instructions, sessions, ...). |
 | `FindScope` | project \| user \| all. |
 | `CardScope` | project \| user \| global on individual cards. |
@@ -255,6 +255,7 @@ Then body is undefined and payload.path_only is true
 
 | Version | Date | Changes |
 |---------|------|---------|
+| 4 | 2026-08-01 | Add OpenAI skill-root discovery and attribution. |
 | 1 | 2026-07-30 | Federated find/where/context (PR1b). |
 | 2 | 2026-07-31 | Full host federation: memory/plugins/mcp/tasks/commands; agent.3md first-class. |
 | 3 | 2026-07-31 | Security: open path_only refusal; project session scope; partial body reads; underRepo bounds. |
diff --git a/specs/doctor/doctor.spec.md b/specs/doctor/doctor.spec.md
index 96655db..9a5e2d3 100644
--- a/specs/doctor/doctor.spec.md
+++ b/specs/doctor/doctor.spec.md
@@ -1,6 +1,6 @@
 ---
 module: doctor
-version: 1
+version: 2
 status: active
 files:
   - src/doctor.ts
@@ -32,6 +32,7 @@ defaults. Used by `let doctor --json`.
 2. Report always includes a git check and bun check.
 3. Config summary exposes allow_shell_exec and default_limit.
 4. Codex worktrees root is noted as shallow-scan only when present.
+5. OpenAI home and skills roots are reported when skill discovery supports OpenAI.
 
 ## Behavioral Examples
 
@@ -57,4 +58,5 @@ Then checks include id "git" with ok true and id "bun" with ok true
 
 | Version | Date | Changes |
 |---------|------|---------|
+| 2 | 2026-08-01 | Report OpenAI home and skills roots. |
 | 1 | 2026-07-30 | Initial doctor contract. |
diff --git a/specs/paths/paths.spec.md b/specs/paths/paths.spec.md
index c7311ad..1740c36 100644
--- a/specs/paths/paths.spec.md
+++ b/specs/paths/paths.spec.md
@@ -1,6 +1,6 @@
 ---
 module: paths
-version: 1
+version: 2
 status: active
 files:
   - src/paths.ts
@@ -12,8 +12,8 @@ depends_on: []
 
 ## Purpose
 
-Host and project path helpers for Claude, Grok, Codex, Cursor, and let directories,
-plus Claude project path encoding.
+Host and project path helpers for Claude, Grok, Codex, Cursor, Gemini, Kimi, OpenAI, and let
+directories, plus Claude project path encoding.
 
 ## Public API
 
@@ -26,6 +26,7 @@ plus Claude project path encoding.
 | `grokHome` | `~/.grok`. |
 | `codexHome` | `~/.codex`. |
 | `cursorHome` | `~/.cursor`. |
+| `openaiHome` | `~/.openai`. |
 | `geminiHome` | `~/.gemini`. |
 | `kimiHome` | `~/.kimi-code`. |
 | `projectClaudeDir` | `<repo>/.claude`. |
@@ -63,4 +64,5 @@ Then result is -Users-leif-Development--CorvidLabs-quill
 
 | Version | Date | Changes |
 |---------|------|---------|
+| 2 | 2026-08-01 | Add the OpenAI home helper contract. |
 | 1 | 2026-07-30 | Initial path helpers. |
diff --git a/src/catalog/scan-policy.ts b/src/catalog/scan-policy.ts
index 14e70e4..742b6f1 100644
--- a/src/catalog/scan-policy.ts
+++ b/src/catalog/scan-policy.ts
@@ -10,6 +10,7 @@ import {
   cursorHome,
   grokHome,
   homeDir,
+  openaiHome,
 } from "../paths.ts";
 
 export type ScanPolicy = {
@@ -88,6 +89,7 @@ export function skillRoots(repoRoot: string | null): {
       join(repoRoot, ".grok", "skills"),
       join(repoRoot, ".cursor", "skills"),
       join(repoRoot, ".cursor", "skills-cursor"),
+      join(repoRoot, ".openai", "skills"),
       join(repoRoot, ".let", "skills"),
       join(repoRoot, "skills"),
       join(repoRoot, ".agents", "skills"),
@@ -99,6 +101,7 @@ export function skillRoots(repoRoot: string | null): {
     join(grokHome(), "skills"),
     join(cursorHome(), "skills-cursor"),
     join(cursorHome(), "skills"),
+    join(openaiHome(), "skills"),
     join(codexHome(), "skills"),
     join(homeDir(), ".let", "skills"),
   ];
diff --git a/src/catalog/skills.ts b/src/catalog/skills.ts
index dc6b9a1..ade1dcd 100644
--- a/src/catalog/skills.ts
+++ b/src/catalog/skills.ts
@@ -12,6 +12,7 @@ import {
   pathExists,
   readTextFile,
 } from "../fs-scan.ts";
+import { openaiHome } from "../paths.ts";
 import { skillId } from "./ids.ts";
 import { skillRoots } from "./scan-policy.ts";
 import type { HostId, IndexCard } from "./types.ts";
@@ -26,6 +27,12 @@ function hostForSkillRoot(root: string, ctx: ScanContext): HostId {
   if (root.includes("/.cursor/") || root.includes("skills-cursor")) {
     return "cursor";
   }
+  if (
+    root === join(openaiHome(), "skills") ||
+    (ctx.repoRoot !== null && root === join(ctx.repoRoot, ".openai", "skills"))
+  ) {
+    return "openai";
+  }
   if (root.includes("/.codex/")) {
     return "codex";
   }
diff --git a/src/catalog/types.ts b/src/catalog/types.ts
index eb59fec..bd7302d 100644
--- a/src/catalog/types.ts
+++ b/src/catalog/types.ts
@@ -7,6 +7,7 @@ export type HostId =
   | "grok"
   | "codex"
   | "cursor"
+  | "openai"
   | "gemini"
   | "kimi"
   | "git"
diff --git a/src/doctor.ts b/src/doctor.ts
index 93279cf..58e3009 100644
--- a/src/doctor.ts
+++ b/src/doctor.ts
@@ -13,6 +13,7 @@ import {
   grokHome,
   homeDir,
   kimiHome,
+  openaiHome,
   projectClaudeDir,
 } from "./paths.ts";
 
@@ -104,6 +105,8 @@ export function runDoctor(cwd: string = process.cwd()): DoctorReport {
     "cursor.chats": rootEntry(join(cursorHome(), "chats"), "path-only"),
     "cursor.plans": rootEntry(join(cursorHome(), "plans"), "tasks kind"),
     "cursor.worktrees": rootEntry(join(cursorHome(), "worktrees")),
+    "openai.home": rootEntry(openaiHome()),
+    "openai.skills": rootEntry(join(openaiHome(), "skills")),
     "gemini.home": rootEntry(
       geminiHome(),
       "GEMINI.md + history + projects.json",
diff --git a/src/index.ts b/src/index.ts
index 40e87a2..233c8d9 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -94,6 +94,7 @@ export {
   grokHome,
   homeDir,
   kimiHome,
+  openaiHome,
   projectClaudeDir,
   projectGeminiDir,
   projectLetDir,
diff --git a/src/paths.ts b/src/paths.ts
index d572444..38367bc 100644
--- a/src/paths.ts
+++ b/src/paths.ts
@@ -26,6 +26,11 @@ export function cursorHome(): string {
   return join(homeDir(), ".cursor");
 }
 
+/** OpenAI agent/CLI home. */
+export function openaiHome(): string {
+  return join(homeDir(), ".openai");
+}
+
 /** Google Gemini CLI / Antigravity home. */
 export function geminiHome(): string {
   return join(homeDir(), ".gemini");
diff --git a/test/doctor.test.ts b/test/doctor.test.ts
index fa07025..cde17e6 100644
--- a/test/doctor.test.ts
+++ b/test/doctor.test.ts
@@ -7,6 +7,7 @@ describe("runDoctor", () => {
     expect(report.version).toBeTruthy();
     expect(report.checks.length).toBeGreaterThan(0);
     expect(report.roots["claude.home"]).toBeDefined();
+    expect(report.roots["openai.skills"]).toBeDefined();
     expect(report.roots["project.claude.worktrees"]).toBeDefined();
     const git = report.checks.find((c) => c.id === "git");
     expect(git).toBeDefined();
diff --git a/test/find.test.ts b/test/find.test.ts
index 9cb09e1..c85fc6a 100644
--- a/test/find.test.ts
+++ b/test/find.test.ts
@@ -1,8 +1,12 @@
 import { describe, expect, test } from "bun:test";
+import { mkdirSync, mkdtempSync, realpathSync, writeFileSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
 import { buildContext } from "../src/catalog/context.ts";
 import { buildScanContext } from "../src/catalog/context-builder.ts";
 import { findAssets } from "../src/catalog/find.ts";
 import { whereAmI } from "../src/catalog/where.ts";
+import { DEFAULT_CONFIG } from "../src/config.ts";
 
 describe("find", () => {
   test("find instructions in let repo", async () => {
@@ -23,6 +27,58 @@ describe("find", () => {
     expect(r.items.length).toBeLessThanOrEqual(ctx.limit);
   });
 
+  test("find skills discovers project openai skill roots", async () => {
+    const root = mkdtempSync(join(tmpdir(), "let-openai-"));
+    Bun.spawnSync(["git", "init"], { cwd: root });
+    const skillDir = join(root, ".openai", "skills", "agent-coordination");
+    mkdirSync(skillDir, { recursive: true });
+    writeFileSync(
+      join(skillDir, "SKILL.md"),
+      "---\nname: agent-coordination\ndescription: Coordinate agents\n---\n# Coordination\n",
+    );
+    const ctx = buildScanContext({
+      cwd: root,
+      scope: "project",
+      config: {
+        ...DEFAULT_CONFIG,
+        find: { ...DEFAULT_CONFIG.find, include_user_skills: false },
+      },
+    });
+    const r = await findAssets("skills", ctx, { host: "openai" });
+    expect(r.items).toHaveLength(1);
+    expect(r.items[0]?.host).toBe("openai");
+    expect(r.items[0]?.name).toBe("agent-coordination");
+    expect(realpathSync(r.items[0]?.path ?? "")).toBe(
+      realpathSync(join(skillDir, "SKILL.md")),
+    );
+  });
+
+  test("find skills keeps generic project roots below .openai attributed to project", async () => {
+    const parent = mkdtempSync(join(tmpdir(), "let-openai-parent-"));
+    const root = join(parent, ".openai", "worktrees", "repo");
+    mkdirSync(root, { recursive: true });
+    Bun.spawnSync(["git", "init"], { cwd: root });
+    const skillDir = join(root, "skills", "generic-skill");
+    mkdirSync(skillDir, { recursive: true });
+    writeFileSync(join(skillDir, "SKILL.md"), "# Generic skill\n");
+
+    const ctx = buildScanContext({
+      cwd: root,
+      scope: "project",
+      config: {
+        ...DEFAULT_CONFIG,
+        find: { ...DEFAULT_CONFIG.find, include_user_skills: false },
+      },
+    });
+    const r = await findAssets("skills", ctx, { host: "project" });
+    const genericSkill = r.items.find(
+      (item) =>
+        realpathSync(item.path) === realpathSync(join(skillDir, "SKILL.md")),
+    );
+
+    expect(genericSkill?.host).toBe("project");
+  });
+
   test("find worktrees dedupes paths", async () => {
     const ctx = buildScanContext({ cwd: process.cwd() });
     const r = await findAssets("worktrees", ctx);