diff --git a/dev/ACTIVE_TASK.json b/dev/ACTIVE_TASK.json
index 304917d..0aff802 100644
--- a/dev/ACTIVE_TASK.json
+++ b/dev/ACTIVE_TASK.json
@@ -1,5 +1,5 @@
 {
-  "task_file": "dev/tasks/DEV-000249-task-evaluation-model-failover.json",
-  "task_id": "DEV-000249",
+  "task_file": "dev/tasks/DEV-000250-task-evaluation-terminal-callback.json",
+  "task_id": "DEV-000250",
   "task_revision": 1
 }
diff --git a/dev/tasks/DEV-000250-task-evaluation-terminal-callback.json b/dev/tasks/DEV-000250-task-evaluation-terminal-callback.json
new file mode 100644
index 0000000..b51a8f9
--- /dev/null
+++ b/dev/tasks/DEV-000250-task-evaluation-terminal-callback.json
@@ -0,0 +1,23 @@
+{
+  "task_id": "DEV-000250",
+  "task_revision": 1,
+  "architecture_revision": "ADR-0018",
+  "base_repo_revision": "2b8cea5aa8f43f597b2af7d92c2eaa305d68256e",
+  "risk_tier": "E",
+  "intent": "Preserve the scheduled Work Graph revision in task-evaluation dispatch context so verifier callbacks complete the current immutable graph revision and reach terminal state.",
+  "requirement_ids": ["live task evaluation", "Work Graph integration", "durable callback lineage"],
+  "allowed_change_scope": {"modules": ["work"], "paths": ["modules/work/application/**", "modules/work/domain/**", "dev/ACTIVE_TASK.json", "dev/tasks/DEV-000250-task-evaluation-terminal-callback.json"]},
+  "forbidden_change_scope": {"paths": ["architecture/**", "security/**", "database/**", "deploy/**", "contracts/**", "LLM-local/**", "cmd/cognitive-worker/**", "cmd/agent-worker/**"]},
+  "allowed_architecture_delta": {"new_cross_module_dependencies": 0, "new_canonical_owners": 0, "new_privileges": 0, "new_third_party_dependencies": 0, "new_database_owner_roles": 0},
+  "contracts": {"consume": ["existing WorkGraph scheduler", "existing TaskEvaluationDispatchContext", "existing callback contract"], "may_change": []},
+  "semantic_owner": "Work Graph task-evaluation scheduling",
+  "canonical_state": ["existing immutable graph revisions and node states only"],
+  "state_transitions": ["scheduled revision -> evaluator callback -> completed revision -> terminal graph"],
+  "side_effects_and_privileges": ["existing work and capability owner writes; no new privileges"],
+  "persistence_and_migrations": ["none"],
+  "failure_retry_restart": ["callback uses the revision that contains the leased node; duplicate callback remains protected by existing immutable revision/idempotency behavior"],
+  "assumptions": ["scheduler increments the draft graph revision exactly once before enqueueing dispatches"],
+  "acceptance_scenarios": ["live task-evaluation callback updates scheduled revision", "unknown evaluation reaches graph terminal state", "successful verified evaluation reaches graph terminal state", "callback lineage remains serializable"],
+  "required_tests": ["go test ./modules/work/application ./modules/work/domain", "go vet ./modules/work/application ./modules/work/domain", "go run ./cmd/devctl preflight -active dev/ACTIVE_TASK.json", "go run ./cmd/devctl check-diff -active dev/ACTIVE_TASK.json", "go run ./cmd/devctl check-architecture", "git diff --check", "independent", "CI", "production health smoke", "live task-evaluation canary"],
+  "terminal_gap_states": ["BLOCKED_BY_MISSING_CAPABILITY", "BLOCKED_BY_SPEC_GAP"]
+}