diff --git a/docs/superpowers/plans/2026-05-05-extended-auth-specs.md b/docs/superpowers/plans/2026-05-05-extended-auth-specs.md
new file mode 100644
index 0000000..2ec4a57
--- /dev/null
+++ b/docs/superpowers/plans/2026-05-05-extended-auth-specs.md
@@ -0,0 +1,279 @@
+# Extended Auth Specs Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Add OAuth2AuthCodeAuth and OAuth1Auth specs to the auth module, promoting local definitions from mountainash-wearables into the shared library.
+
+**Architecture:** Two new frozen Pydantic models extending AuthSpec with Literal discriminators. Integrated into existing exports; no dispatch entries.
+
+**Tech Stack:** Python 3.12, Pydantic 2.9.2, pytest 8.3.5
+
+---
+
+### Task 1: OAuth2AuthCodeAuth — test and implementation
+
+**Files:**
+- Create: `src/mountainash_settings/auth/oauth2_authcode.py`
+- Test: `tests/unit/auth/test_subclasses.py` (modify)
+
+- [ ] **Step 1: Write the failing tests**
+
+Add to `tests/unit/auth/test_subclasses.py`:
+
+```python
+# Add to imports at top:
+from mountainash_settings.auth import OAuth2AuthCodeAuth
+
+# Add to TestAuthDiscriminator parametrize list:
+(OAuth2AuthCodeAuth, "oauth2_authcode"),
+
+# Update the test_every_auth_has_discriminator_kind body to handle the new required-fields class:
+elif cls is OAuth2AuthCodeAuth:
+    instance = cls(client_id="cid", client_secret=SecretStr("csec"))
+
+# Add new test class after TestOAuth2Auth:
+@pytest.mark.unit
+class TestOAuth2AuthCodeAuth:
+    def test_requires_client_id_and_secret(self):
+        with pytest.raises(ValidationError):
+            OAuth2AuthCodeAuth()  # type: ignore[call-arg]
+
+    def test_client_secret_is_secretstr(self):
+        auth = OAuth2AuthCodeAuth(client_id="cid", client_secret="secret")
+        assert isinstance(auth.client_secret, SecretStr)
+        assert auth.client_secret.get_secret_value() == "secret"
+
+    def test_optional_fields_default_none(self):
+        auth = OAuth2AuthCodeAuth(client_id="cid", client_secret="s")
+        assert auth.access_token is None
+        assert auth.refresh_token is None
+        assert auth.token_expires_at is None
+        assert auth.scope is None
+
+    def test_access_token_is_secretstr(self):
+        auth = OAuth2AuthCodeAuth(
+            client_id="cid", client_secret="s", access_token="tok"
+        )
+        assert isinstance(auth.access_token, SecretStr)
+
+    def test_token_expires_at_accepts_int(self):
+        auth = OAuth2AuthCodeAuth(
+            client_id="cid", client_secret="s", token_expires_at=1714900000
+        )
+        assert auth.token_expires_at == 1714900000
+```
+
+- [ ] **Step 2: Run tests to verify they fail**
+
+Run: `hatch run test:test tests/unit/auth/test_subclasses.py -v`
+Expected: ImportError — `cannot import name 'OAuth2AuthCodeAuth'`
+
+- [ ] **Step 3: Write the implementation**
+
+Create `src/mountainash_settings/auth/oauth2_authcode.py`:
+
+```python
+"""OAuth 2.0 Authorization Code grant authentication."""
+
+from __future__ import annotations
+
+import typing as t
+
+from pydantic import SecretStr
+
+from .base import AuthSpec
+
+__all__ = ["OAuth2AuthCodeAuth"]
+
+
+class OAuth2AuthCodeAuth(AuthSpec):
+    """OAuth 2.0 Authorization Code grant credentials and tokens."""
+
+    kind: t.Literal["oauth2_authcode"] = "oauth2_authcode"
+    client_id: str
+    client_secret: SecretStr
+    access_token: SecretStr | None = None
+    refresh_token: SecretStr | None = None
+    token_expires_at: int | None = None
+    scope: str | None = None
+```
+
+- [ ] **Step 4: Run tests to verify they pass**
+
+Run: `hatch run test:test tests/unit/auth/test_subclasses.py -v`
+Expected: All PASS
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add src/mountainash_settings/auth/oauth2_authcode.py tests/unit/auth/test_subclasses.py
+git commit -m "feat(auth): add OAuth2AuthCodeAuth spec with tests"
+```
+
+---
+
+### Task 2: OAuth1Auth — test and implementation
+
+**Files:**
+- Create: `src/mountainash_settings/auth/oauth1.py`
+- Test: `tests/unit/auth/test_subclasses.py` (modify)
+
+- [ ] **Step 1: Write the failing tests**
+
+Add to `tests/unit/auth/test_subclasses.py`:
+
+```python
+# Add to imports:
+from mountainash_settings.auth import OAuth1Auth
+
+# Add to TestAuthDiscriminator parametrize list:
+(OAuth1Auth, "oauth1"),
+
+# Update the test_every_auth_has_discriminator_kind body:
+elif cls is OAuth1Auth:
+    instance = cls(consumer_key="ck", consumer_secret=SecretStr("cs"))
+
+# Add new test class:
+@pytest.mark.unit
+class TestOAuth1Auth:
+    def test_requires_consumer_key_and_secret(self):
+        with pytest.raises(ValidationError):
+            OAuth1Auth()  # type: ignore[call-arg]
+
+    def test_consumer_secret_is_secretstr(self):
+        auth = OAuth1Auth(consumer_key="ck", consumer_secret="secret")
+        assert isinstance(auth.consumer_secret, SecretStr)
+        assert auth.consumer_secret.get_secret_value() == "secret"
+
+    def test_optional_fields_default_none(self):
+        auth = OAuth1Auth(consumer_key="ck", consumer_secret="s")
+        assert auth.access_token is None
+        assert auth.access_token_secret is None
+
+    def test_access_token_is_secretstr(self):
+        auth = OAuth1Auth(
+            consumer_key="ck", consumer_secret="s", access_token="tok"
+        )
+        assert isinstance(auth.access_token, SecretStr)
+
+    def test_access_token_secret_is_secretstr(self):
+        auth = OAuth1Auth(
+            consumer_key="ck", consumer_secret="s", access_token_secret="sec"
+        )
+        assert isinstance(auth.access_token_secret, SecretStr)
+```
+
+- [ ] **Step 2: Run tests to verify they fail**
+
+Run: `hatch run test:test tests/unit/auth/test_subclasses.py -v`
+Expected: ImportError — `cannot import name 'OAuth1Auth'`
+
+- [ ] **Step 3: Write the implementation**
+
+Create `src/mountainash_settings/auth/oauth1.py`:
+
+```python
+"""OAuth 1.0a authentication."""
+
+from __future__ import annotations
+
+import typing as t
+
+from pydantic import SecretStr
+
+from .base import AuthSpec
+
+__all__ = ["OAuth1Auth"]
+
+
+class OAuth1Auth(AuthSpec):
+    """OAuth 1.0a credentials and tokens."""
+
+    kind: t.Literal["oauth1"] = "oauth1"
+    consumer_key: str
+    consumer_secret: SecretStr
+    access_token: SecretStr | None = None
+    access_token_secret: SecretStr | None = None
+```
+
+- [ ] **Step 4: Run tests to verify they pass**
+
+Run: `hatch run test:test tests/unit/auth/test_subclasses.py -v`
+Expected: All PASS
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add src/mountainash_settings/auth/oauth1.py tests/unit/auth/test_subclasses.py
+git commit -m "feat(auth): add OAuth1Auth spec with tests"
+```
+
+---
+
+### Task 3: Export integration
+
+**Files:**
+- Modify: `src/mountainash_settings/auth/__init__.py`
+- Modify: `src/mountainash_settings/__init__.py`
+- Test: `tests/unit/test_public_api.py` (verify existing public API test picks them up)
+
+- [ ] **Step 1: Update auth/__init__.py**
+
+Add imports and `__all__` entries:
+
+```python
+# Add imports (alphabetical position):
+from .oauth2_authcode import OAuth2AuthCodeAuth
+from .oauth1 import OAuth1Auth
+
+# Add to __all__ (alphabetical position):
+"OAuth1Auth",
+"OAuth2AuthCodeAuth",
+```
+
+- [ ] **Step 2: Update top-level __init__.py**
+
+Add to the `from .auth import (...)` block:
+
+```python
+OAuth1Auth,
+OAuth2AuthCodeAuth,
+```
+
+Add to `__all__` under the `# Auth` section:
+
+```python
+"OAuth1Auth",
+"OAuth2AuthCodeAuth",
+```
+
+- [ ] **Step 3: Run full test suite**
+
+Run: `hatch run test:test -v`
+Expected: All PASS, including any public API surface tests
+
+- [ ] **Step 4: Commit**
+
+```bash
+git add src/mountainash_settings/auth/__init__.py src/mountainash_settings/__init__.py
+git commit -m "feat(auth): export OAuth2AuthCodeAuth and OAuth1Auth from package"
+```
+
+---
+
+### Task 4: Final verification
+
+- [ ] **Step 1: Run full test suite with coverage**
+
+Run: `hatch run test:cov`
+Expected: All pass, new files have coverage
+
+- [ ] **Step 2: Run linter**
+
+Run: `hatch run ruff:check`
+Expected: No errors
+
+- [ ] **Step 3: Run type checker**
+
+Run: `hatch run mypy:check`
+Expected: No errors on new files
diff --git a/docs/superpowers/specs/2026-05-05-extended-auth-specs-design.md b/docs/superpowers/specs/2026-05-05-extended-auth-specs-design.md
new file mode 100644
index 0000000..a8df0de
--- /dev/null
+++ b/docs/superpowers/specs/2026-05-05-extended-auth-specs-design.md
@@ -0,0 +1,72 @@
+# Extended Auth Specs: OAuth2AuthCodeAuth + OAuth1Auth
+
+**Date:** 2026-05-05
+**Requested by:** mountainash-wearables
+**Branch:** feature/auth-oauth-specs
+
+## Summary
+
+Add two new AuthSpec subclasses to mountainash-settings, promoting local definitions from mountainash-wearables into the shared library.
+
+## Specs
+
+### OAuth2AuthCodeAuth
+
+OAuth 2.0 Authorization Code grant with expiry tracking. Distinct from existing `OAuth2Auth` which targets client-credentials/static-token flows.
+
+```python
+class OAuth2AuthCodeAuth(AuthSpec):
+    kind: Literal["oauth2_authcode"] = "oauth2_authcode"
+    client_id: str                        # required
+    client_secret: SecretStr              # required
+    access_token: SecretStr | None = None
+    refresh_token: SecretStr | None = None
+    token_expires_at: int | None = None   # unix timestamp
+    scope: str | None = None
+```
+
+File: `src/mountainash_settings/auth/oauth2_authcode.py`
+
+### OAuth1Auth
+
+OAuth 1.0a credentials and tokens. Required for Garmin Health API and legacy integrations.
+
+```python
+class OAuth1Auth(AuthSpec):
+    kind: Literal["oauth1"] = "oauth1"
+    consumer_key: str                          # required
+    consumer_secret: SecretStr                 # required
+    access_token: SecretStr | None = None
+    access_token_secret: SecretStr | None = None
+```
+
+File: `src/mountainash_settings/auth/oauth1.py`
+
+## Integration
+
+1. Both classes added to `src/mountainash_settings/auth/__init__.py` exports
+2. Both classes added to `src/mountainash_settings/__init__.py` exports and `__all__`
+3. No dispatch entries — consumers handle their own mapping
+
+## Tests
+
+Added to `tests/unit/auth/test_subclasses.py`:
+
+- Parametrized discriminator test extended with both new kinds
+- `TestOAuth2AuthCodeAuth`:
+  - `client_id` and `client_secret` are required (ValidationError without them)
+  - `client_secret` wrapped as SecretStr
+  - Optional fields default to None
+  - `token_expires_at` accepts int
+- `TestOAuth1Auth`:
+  - `consumer_key` and `consumer_secret` are required
+  - `consumer_secret` wrapped as SecretStr
+  - Optional fields default to None
+
+Frozen immutability and extra-field rejection are already covered by existing base tests.
+
+## Out of Scope
+
+- Dispatch map entries (consumers handle auth-to-driver mapping)
+- Token refresh logic (lives in mountainash-wearables)
+- Migration of mountainash-wearables imports (separate PR after version bump)
diff --git a/src/mountainash_settings/__init__.py b/src/mountainash_settings/__init__.py
index 545a5a4..a2b3284 100644
--- a/src/mountainash_settings/__init__.py
+++ b/src/mountainash_settings/__init__.py
@@ -24,7 +24,9 @@
     JWTAuth,
     KerberosAuth,
     NoAuth,
+    OAuth1Auth,
     OAuth2Auth,
+    OAuth2AuthCodeAuth,
     PasswordAuth,
     ServiceAccountAuth,
     TokenAuth,
@@ -60,7 +62,9 @@
     "JWTAuth",
     "KerberosAuth",
     "NoAuth",
+    "OAuth1Auth",
     "OAuth2Auth",
+    "OAuth2AuthCodeAuth",
     "PasswordAuth",
     "ServiceAccountAuth",
     "TokenAuth",
diff --git a/src/mountainash_settings/auth/__init__.py b/src/mountainash_settings/auth/__init__.py
index abeabff..83056d5 100644
--- a/src/mountainash_settings/auth/__init__.py
+++ b/src/mountainash_settings/auth/__init__.py
@@ -8,7 +8,9 @@
 from .iam import IAMAuth
 from .kerberos import KerberosAuth
 from .none import NoAuth
+from .oauth1 import OAuth1Auth
 from .oauth2 import OAuth2Auth
+from .oauth2_authcode import OAuth2AuthCodeAuth
 from .password import PasswordAuth
 from .service_account import ServiceAccountAuth
 from .dispatch import AUTH_TO_DRIVER_KWARGS, auth_to_driver_kwargs
@@ -23,7 +25,9 @@
     "JWTAuth",
     "KerberosAuth",
     "NoAuth",
+    "OAuth1Auth",
     "OAuth2Auth",
+    "OAuth2AuthCodeAuth",
     "PasswordAuth",
     "ServiceAccountAuth",
     "TokenAuth",
diff --git a/src/mountainash_settings/auth/oauth1.py b/src/mountainash_settings/auth/oauth1.py
new file mode 100644
index 0000000..9e6c3d1
--- /dev/null
+++ b/src/mountainash_settings/auth/oauth1.py
@@ -0,0 +1,21 @@
+"""OAuth 1.0a authentication."""
+
+from __future__ import annotations
+
+import typing as t
+
+from pydantic import SecretStr
+
+from .base import AuthSpec
+
+__all__ = ["OAuth1Auth"]
+
+
+class OAuth1Auth(AuthSpec):
+    """OAuth 1.0a credentials and tokens."""
+
+    kind: t.Literal["oauth1"] = "oauth1"
+    consumer_key: str
+    consumer_secret: SecretStr
+    access_token: SecretStr | None = None
+    access_token_secret: SecretStr | None = None
diff --git a/src/mountainash_settings/auth/oauth2_authcode.py b/src/mountainash_settings/auth/oauth2_authcode.py
new file mode 100644
index 0000000..79af852
--- /dev/null
+++ b/src/mountainash_settings/auth/oauth2_authcode.py
@@ -0,0 +1,23 @@
+"""OAuth 2.0 Authorization Code grant authentication."""
+
+from __future__ import annotations
+
+import typing as t
+
+from pydantic import SecretStr
+
+from .base import AuthSpec
+
+__all__ = ["OAuth2AuthCodeAuth"]
+
+
+class OAuth2AuthCodeAuth(AuthSpec):
+    """OAuth 2.0 Authorization Code grant credentials and tokens."""
+
+    kind: t.Literal["oauth2_authcode"] = "oauth2_authcode"
+    client_id: str
+    client_secret: SecretStr
+    access_token: SecretStr | None = None
+    refresh_token: SecretStr | None = None
+    token_expires_at: int | None = None
+    scope: str | None = None
diff --git a/tests/unit/auth/test_subclasses.py b/tests/unit/auth/test_subclasses.py
index fcd5ae6..aa2ebc2 100644
--- a/tests/unit/auth/test_subclasses.py
+++ b/tests/unit/auth/test_subclasses.py
@@ -10,7 +10,9 @@
     JWTAuth,
     KerberosAuth,
     NoAuth,
+    OAuth1Auth,
     OAuth2Auth,
+    OAuth2AuthCodeAuth,
     PasswordAuth,
     ServiceAccountAuth,
     TokenAuth,
@@ -27,7 +29,9 @@ class TestAuthDiscriminator:
             (PasswordAuth, "password"),
             (TokenAuth, "token"),
             (JWTAuth, "jwt"),
+            (OAuth1Auth, "oauth1"),
             (OAuth2Auth, "oauth2"),
+            (OAuth2AuthCodeAuth, "oauth2_authcode"),
             (ServiceAccountAuth, "service_account"),
             (IAMAuth, "iam"),
             (WindowsAuth, "windows"),
@@ -41,6 +45,10 @@ def test_every_auth_has_discriminator_kind(self, cls, kind):
             instance = cls(username="u", password=SecretStr("p"))
         elif cls in (TokenAuth, JWTAuth):
             instance = cls(token=SecretStr("t"))
+        elif cls is OAuth1Auth:
+            instance = cls(consumer_key="ck", consumer_secret=SecretStr("cs"))
+        elif cls is OAuth2AuthCodeAuth:
+            instance = cls(client_id="cid", client_secret=SecretStr("csec"))
         else:
             instance = cls()
         assert instance.kind == kind
@@ -81,3 +89,63 @@ def test_all_fields_optional(self):
     def test_token_is_secret(self):
         auth = OAuth2Auth(token="t")
         assert isinstance(auth.token, SecretStr)
+
+
+@pytest.mark.unit
+class TestOAuth1Auth:
+    def test_requires_consumer_key_and_secret(self):
+        with pytest.raises(ValidationError):
+            OAuth1Auth()  # type: ignore[call-arg]
+
+    def test_consumer_secret_is_secretstr(self):
+        auth = OAuth1Auth(consumer_key="ck", consumer_secret="secret")
+        assert isinstance(auth.consumer_secret, SecretStr)
+        assert auth.consumer_secret.get_secret_value() == "secret"
+
+    def test_optional_fields_default_none(self):
+        auth = OAuth1Auth(consumer_key="ck", consumer_secret="s")
+        assert auth.access_token is None
+        assert auth.access_token_secret is None
+
+    def test_access_token_is_secretstr(self):
+        auth = OAuth1Auth(
+            consumer_key="ck", consumer_secret="s", access_token="tok"
+        )
+        assert isinstance(auth.access_token, SecretStr)
+
+    def test_access_token_secret_is_secretstr(self):
+        auth = OAuth1Auth(
+            consumer_key="ck", consumer_secret="s", access_token_secret="sec"
+        )
+        assert isinstance(auth.access_token_secret, SecretStr)
+
+
+@pytest.mark.unit
+class TestOAuth2AuthCodeAuth:
+    def test_requires_client_id_and_secret(self):
+        with pytest.raises(ValidationError):
+            OAuth2AuthCodeAuth()  # type: ignore[call-arg]
+
+    def test_client_secret_is_secretstr(self):
+        auth = OAuth2AuthCodeAuth(client_id="cid", client_secret="secret")
+        assert isinstance(auth.client_secret, SecretStr)
+        assert auth.client_secret.get_secret_value() == "secret"
+
+    def test_optional_fields_default_none(self):
+        auth = OAuth2AuthCodeAuth(client_id="cid", client_secret="s")
+        assert auth.access_token is None
+        assert auth.refresh_token is None
+        assert auth.token_expires_at is None
+        assert auth.scope is None
+
+    def test_access_token_is_secretstr(self):
+        auth = OAuth2AuthCodeAuth(
+            client_id="cid", client_secret="s", access_token="tok"
+        )
+        assert isinstance(auth.access_token, SecretStr)
+
+    def test_token_expires_at_accepts_int(self):
+        auth = OAuth2AuthCodeAuth(
+            client_id="cid", client_secret="s", token_expires_at=1714900000
+        )
+        assert auth.token_expires_at == 1714900000