diff --git a/crates/ourios-server/tests/it/main.rs b/crates/ourios-server/tests/it/main.rs
index 033f3d0b7..a329750ed 100644
--- a/crates/ourios-server/tests/it/main.rs
+++ b/crates/ourios-server/tests/it/main.rs
@@ -19,3 +19,4 @@ mod rfc0016_query_endpoint;
 mod rfc0019_storage_backend;
 mod rfc0020_config_file;
 mod rfc0026_auth;
+mod rfc0027_mcp;
diff --git a/crates/ourios-server/tests/it/rfc0027_mcp.rs b/crates/ourios-server/tests/it/rfc0027_mcp.rs
new file mode 100644
index 000000000..6010dff2f
--- /dev/null
+++ b/crates/ourios-server/tests/it/rfc0027_mcp.rs
@@ -0,0 +1,86 @@
+//! RFC 0027 §5 — the MCP query surface, all seven scenarios.
+//!
+//! Stubs are `#[ignore]`d so the default run stays green while the
+//! RFC is red; each names the green slice that discharges it.
+
+/// Scenario RFC0027.1 — gating and placement.
+/// See `docs/rfcs/0027-mcp-query-surface.md` §5.
+#[test]
+#[ignore = "RFC0027.1 stub — implemented in the transport green slice"]
+fn rfc0027_1_gating_and_placement() {
+    todo!(
+        "RFC0027.1 — querier.mcp.enabled off: /mcp is 404 and the JSON \
+         API endpoints are behaviorally unchanged; on: /mcp speaks MCP \
+         streamable HTTP on the same listener; no new crate"
+    );
+}
+
+/// Scenario RFC0027.2 — the RFC 0026 gate applies verbatim.
+/// See `docs/rfcs/0027-mcp-query-surface.md` §5.
+#[test]
+#[ignore = "RFC0027.2 stub — implemented in the transport green slice"]
+fn rfc0027_2_rfc0026_gate_applies_verbatim() {
+    todo!(
+        "RFC0027.2 — missing/unknown bearer rejected before tool \
+         dispatch; out-of-set tenant fails tenant-denied touching no \
+         data; open mode serves MCP as it serves the JSON API"
+    );
+}
+
+/// Scenario RFC0027.3 — `query_logs`.
+/// See `docs/rfcs/0027-mcp-query-surface.md` §5.
+#[test]
+#[ignore = "RFC0027.3 stub — implemented in the tools green slice"]
+fn rfc0027_3_query_logs() {
+    todo!(
+        "RFC0027.3 — count + limited rendered rows + pruning stats, \
+         equal to the JSON API's answer for the same statement; DSL \
+         errors surface as tool errors, never transport failures"
+    );
+}
+
+/// Scenario RFC0027.4 — `list_templates`.
+/// See `docs/rfcs/0027-mcp-query-surface.md` §5.
+#[test]
+#[ignore = "RFC0027.4 stub — implemented in the tools green slice"]
+fn rfc0027_4_list_templates() {
+    todo!(
+        "RFC0027.4 — (template_id, rendered_template, version) rows \
+         matching the RFC 0017 registry surface for the tenant"
+    );
+}
+
+/// Scenario RFC0027.5 — `template_drift`.
+/// See `docs/rfcs/0027-mcp-query-surface.md` §5.
+#[test]
+#[ignore = "RFC0027.5 stub — implemented in the tools green slice"]
+fn rfc0027_5_template_drift() {
+    todo!(
+        "RFC0027.5 — the analysis over [from, to) equals the RFC 0010 \
+         drift surface's for the same half-open window"
+    );
+}
+
+/// Scenario RFC0027.6 — the grammar resource.
+/// See `docs/rfcs/0027-mcp-query-surface.md` §5.
+#[test]
+#[ignore = "RFC0027.6 stub — implemented in the resource green slice"]
+fn rfc0027_6_grammar_resource() {
+    todo!(
+        "RFC0027.6 — the served resource is byte-identical to the \
+         RFC 0002 §7 grammar section of docs/rfcs/0002-query-dsl.md \
+         (include_str!, trimmed at startup)"
+    );
+}
+
+/// Scenario RFC0027.7 — output discipline.
+/// See `docs/rfcs/0027-mcp-query-surface.md` §5.
+#[test]
+#[ignore = "RFC0027.7 stub — implemented in the tools green slice"]
+fn rfc0027_7_output_discipline() {
+    todo!(
+        "RFC0027.7 — tool results are the RFC 0016 JSON shapes as MCP \
+         content; every tool description carries the treat-log-bodies-\
+         as-data warning; no tenant enumeration, no SQL"
+    );
+}
diff --git a/docs/rfcs/0027-mcp-query-surface.md b/docs/rfcs/0027-mcp-query-surface.md
index 2cbeaff0f..f572055bc 100644
--- a/docs/rfcs/0027-mcp-query-surface.md
+++ b/docs/rfcs/0027-mcp-query-surface.md
@@ -1,7 +1,7 @@
 ---
 rfc: 0027
 title: MCP query surface (agent-facing read tools over the querier)
-status: specified
+status: red
 author: Jens Holdgaard Pedersen <jens@holdgaard.org>
 drafting-assistance: Claude
 created: 2026-07-05