diff --git a/crates/gateway/src/execution_loop/mod.rs b/crates/gateway/src/execution_loop/mod.rs
index a45e7af..e3da7b7 100644
--- a/crates/gateway/src/execution_loop/mod.rs
+++ b/crates/gateway/src/execution_loop/mod.rs
@@ -82,7 +82,7 @@ pub struct Fill {
 pub enum RespondOutcome {
     Ok { artifact: serde_json::Value, log: Vec<LogEntry> },
     Failed { reason: String, log: Vec<LogEntry> },
-    #[allow(dead_code)] // reserved for Phase 42 truth-gate (step 6)
+    // Constructed by the truth-gate check in run_inner (step 6, 2026-04-24).
     Blocked { reason: String, log: Vec<LogEntry> },
 }
 
@@ -153,7 +153,21 @@ impl ExecutionLoop {
             .as_deref().unwrap_or(DEFAULT_REVIEWER_MODEL).to_string();
         let max_turns = self.req.max_turns.unwrap_or(DEFAULT_MAX_TURNS);
 
-        // --- (6) TRUTH GATE — PORT FROM Phase 42 (TODO) ---
+        // --- (6) TRUTH GATE — Phase 42 wiring (2026-04-24) ---
+        // Evaluate truth rules for the request's task_class against a
+        // ctx built from the spec. Any rule whose condition holds AND
+        // whose action is Reject/Block short-circuits to Blocked before
+        // the executor loop runs. Mirrors queryd/service.rs SQL gate.
+        let truth_store = truth::default_truth_store();
+        for outcome in truth_store.evaluate(&self.req.task_class, &self.req.spec) {
+            if !outcome.passed { continue; }
+            if let truth::RuleAction::Reject { message } | truth::RuleAction::Block { message } = &outcome.action {
+                let reason = format!("truth rule {} blocked: {message}", outcome.rule_id);
+                self.append(LogEntry::new(0, "system", "truth", "block",
+                    serde_json::json!({ "rule_id": outcome.rule_id, "reason": reason.clone() })));
+                return Ok(RespondOutcome::Blocked { reason, log: self.log.clone() });
+            }
+        }
 
         // --- (1) PLAYBOOK BOOST ---
         let boost = self.fetch_playbook_boost(&self.req.operation).await.unwrap_or_default();