diff --git a/ampg/manifest.py b/ampg/manifest.py
index ac3cefa..1c07f0a 100644
--- a/ampg/manifest.py
+++ b/ampg/manifest.py
@@ -9,6 +9,22 @@ from .config import GatewayConfig, ProtocolConfig, RoutePolicyConfig, SiteConfig
 
 
 SCHEMA = "ampg.fixture-manifest.v1"
+TIER_ORDER = {
+    "static": 0,
+    "interactive-lite": 1,
+    "identity": 2,
+    "transactional": 3,
+    "realtime": 4,
+    "internal": 5,
+}
+DEFAULT_MAX_TIERS = {
+    "clearnet": "realtime",
+    "tor": "transactional",
+    "i2p": "transactional",
+    "gemini": "interactive-lite",
+    "ipfs": "static",
+    "reticulum": "interactive-lite",
+}
 
 
 @dataclass(frozen=True)
@@ -27,7 +43,7 @@ def fixture_manifest(site: SiteConfig) -> dict[str, Any]:
         fixtures.extend(
             _fixture_entry(site, protocol, route_policy)
             for route_policy in site.interactions.routes
-            if _route_is_public(route_policy)
+            if _route_is_public(route_policy) and _route_supported(protocol, route_policy)
         )
     return {
         "schema": SCHEMA,
@@ -101,6 +117,18 @@ def _route_is_public(route_policy: RoutePolicyConfig) -> bool:
     return route_policy.public_allowed and route_policy.tier != "internal"
 
 
+def _route_supported(protocol: ProtocolConfig, route_policy: RoutePolicyConfig) -> bool:
+    max_tier = str(protocol.options.get("max_tier", DEFAULT_MAX_TIERS.get(protocol.name, "static")))
+    return _tier_rank(route_policy.tier) <= _tier_rank(max_tier)
+
+
+def _tier_rank(tier: str) -> int:
+    try:
+        return TIER_ORDER[tier]
+    except KeyError as exc:
+        raise ValueError(f"unsupported interaction tier {tier!r}") from exc
+
+
 def _interaction_policy(
     protocol: ProtocolConfig,
     route_policy: RoutePolicyConfig | None,
diff --git a/ampg/metadata.py b/ampg/metadata.py
index 6b5694b..c597519 100644
--- a/ampg/metadata.py
+++ b/ampg/metadata.py
@@ -195,6 +195,14 @@ CONFIG_FIELDS = (
         "strip",
         "Script handling policy for privacy-html render targets.",
     ),
+    ConfigField(
+        "site.protocols.<name>",
+        "max_tier",
+        "enum",
+        False,
+        "transport default",
+        "Maximum interaction tier this protocol target may expose.",
+    ),
 )
 
 
diff --git a/docs/fixture-manifests.md b/docs/fixture-manifests.md
index 82f3b4a..5ba43a5 100644
--- a/docs/fixture-manifests.md
+++ b/docs/fixture-manifests.md
@@ -65,3 +65,7 @@ not emitted.
 
 Routes imported from `site.interactions.route_manifest` are treated the same way as inline
 TOML routes.
+
+AMPG also omits route fixtures whose interaction tier exceeds the protocol target's
+`max_tier`. When `max_tier` is not configured, AMPG uses the transport capability defaults
+from the generated interaction capability matrix.
diff --git a/docs/generated/config-schema.md b/docs/generated/config-schema.md
index 3dd8469..c7d142a 100644
--- a/docs/generated/config-schema.md
+++ b/docs/generated/config-schema.md
@@ -28,3 +28,4 @@ This file is generated from code. Do not edit it by hand.
 | site.protocols.<name> | `daemon_policy` | enum | no | protocol default | Whether AMPG adopts, manages, or only renders config. |
 | site.protocols.<name> | `max_asset_bytes` | integer | no | 1048576 | Maximum asset size copied by privacy-html render targets. |
 | site.protocols.<name> | `script_policy` | enum | no | strip | Script handling policy for privacy-html render targets. |
+| site.protocols.<name> | `max_tier` | enum | no | transport default | Maximum interaction tier this protocol target may expose. |
diff --git a/tests/test_fixture_manifest.py b/tests/test_fixture_manifest.py
index 4670ade..dc8a8cf 100644
--- a/tests/test_fixture_manifest.py
+++ b/tests/test_fixture_manifest.py
@@ -303,6 +303,70 @@ renderer = "privacy-html"
             with self.assertRaisesRegex(ValueError, "route manifest schema"):
                 load_config(config_path)
 
+    def test_manifest_omits_routes_above_protocol_max_tier(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            root = Path(tmp)
+            source = root / "site"
+            source.mkdir()
+            (source / "index.html").write_text("<h1>App</h1>", encoding="utf-8")
+            config_path = root / "gateway.toml"
+            config_path.write_text(
+                """
+[[site]]
+id = "app"
+domain = "app.test"
+
+[site.source]
+kind = "static-html"
+path = "./site"
+
+[site.outputs]
+root = "./out"
+plan_root = "./plan"
+
+[[site.interactions.route]]
+match = "/play/*"
+tier = "interactive-lite"
+
+[[site.interactions.route]]
+match = "/checkout/*"
+tier = "transactional"
+
+[[site.interactions.route]]
+match = "/live/*"
+tier = "realtime"
+realtime = true
+
+[site.protocols.tor]
+enabled = true
+renderer = "privacy-html"
+max_tier = "interactive-lite"
+
+[site.protocols.gemini]
+enabled = true
+renderer = "gemtext"
+
+[site.protocols.ipfs]
+enabled = true
+renderer = "clearnet"
+cid = "bafyexample"
+""",
+                encoding="utf-8",
+            )
+
+            config = load_config(config_path)
+            manifest = fixture_manifest(config.sites[0])
+
+        by_protocol = {}
+        for fixture in manifest["fixtures"]:
+            by_protocol.setdefault(fixture["protocol"], []).append(
+                fixture.get("route", {}).get("fixture_path", "/")
+            )
+
+        self.assertEqual(["/", "/play/"], by_protocol["tor"])
+        self.assertEqual(["/", "/play/"], by_protocol["gemini"])
+        self.assertEqual(["/"], by_protocol["ipfs"])
+
 
 if __name__ == "__main__":
     unittest.main()