diff --git a/decnet/cli/gating.py b/decnet/cli/gating.py
index 19b039c9..a5db1925 100644
--- a/decnet/cli/gating.py
+++ b/decnet/cli/gating.py
@@ -30,6 +30,7 @@ MASTER_ONLY_COMMANDS: frozenset[str] = frozenset({
     "mutate", "listener", "profiler",
     "services", "distros", "correlate", "archetypes", "web",
     "db-reset", "init", "webhook", "clusterer", "campaign-clusterer",
+    "ttp",
 })
 MASTER_ONLY_GROUPS: frozenset[str] = frozenset(
     {"swarm", "topology", "geoip", "realism"}
diff --git a/decnet/cli/workers.py b/decnet/cli/workers.py
index 4d4ae7db..c126e3dc 100644
--- a/decnet/cli/workers.py
+++ b/decnet/cli/workers.py
@@ -295,3 +295,57 @@ def register(app: typer.Typer) -> None:
             asyncio.run(_run())
         except KeyboardInterrupt:
             console.print("\n[yellow]Campaign clusterer stopped.[/]")
+
+    @app.command(name="ttp")
+    def ttp(
+        poll_interval_secs: float = typer.Option(
+            60.0, "--poll-interval", "-i",
+            help="Slow-tick fallback when the bus is idle or unavailable (seconds)",
+        ),
+        daemon: bool = typer.Option(
+            False, "--daemon", "-d",
+            help="Detach to background as a daemon process",
+        ),
+    ) -> None:
+        """TTP-tagging worker — MITRE ATT&CK technique tagging.
+
+        Bus-woken on ``attacker.session.ended`` / ``attacker.observed``
+        / ``attacker.intel.enriched`` / ``identity.formed`` /
+        ``identity.merged`` / ``credential.reuse.detected`` /
+        ``email.received`` / ``canary.>``. Dispatches each event
+        through the :class:`CompositeTagger` (RuleEngine +
+        Behavioral / Intel / Email / CanaryFingerprint / Identity /
+        Credential lifters), persists ``ttp_tag`` rows via the
+        idempotent ``INSERT OR IGNORE`` write, and publishes
+        ``ttp.tagged`` + per-technique ``ttp.rule.fired.*`` only when
+        the insert returned a non-zero rowcount (loop-prevention
+        invariant from TTP_TAGGING.md §"Bus topics").
+        """
+        import asyncio
+        from decnet.cli.gating import _require_master_mode
+        from decnet.ttp.worker import run_ttp_worker_loop
+        from decnet.web.dependencies import repo
+
+        _require_master_mode("ttp")
+
+        if daemon:
+            log.info("ttp daemonizing poll=%s", poll_interval_secs)
+            _utils._daemonize()
+
+        log.info("ttp command invoked poll=%s", poll_interval_secs)
+        console.print(
+            f"[bold cyan]TTP tagging worker starting[/] "
+            f"poll={poll_interval_secs}s"
+        )
+        console.print("[dim]Press Ctrl+C to stop[/]")
+
+        async def _run() -> None:
+            await repo.initialize()
+            await run_ttp_worker_loop(
+                repo, poll_interval_secs=poll_interval_secs,
+            )
+
+        try:
+            asyncio.run(_run())
+        except KeyboardInterrupt:
+            console.print("\n[yellow]TTP tagging worker stopped.[/]")
diff --git a/deploy/decnet-ttp.service.j2 b/deploy/decnet-ttp.service.j2
new file mode 100644
index 00000000..e466084c
--- /dev/null
+++ b/deploy/decnet-ttp.service.j2
@@ -0,0 +1,57 @@
+[Unit]
+Description=DECNET TTP Tagger (MITRE ATT&CK technique tagging)
+Documentation=https://git.resacachile.cl/anti/DECNET/wiki/Workers#ttp-tagger
+After=network-online.target decnet-bus.service decnet-clusterer.service decnet-enrich.service decnet-reuse-correlator.service
+Wants=network-online.target decnet-bus.service
+
+[Service]
+Type=simple
+User={{ user }}
+Group={{ group }}
+WorkingDirectory={{ install_dir }}
+EnvironmentFile=-{{ install_dir }}/.env.local
+Environment=DECNET_SYSTEM_LOGS=/var/log/decnet/decnet.ttp.log
+# Subscribes to attacker.session.ended (primary), attacker.observed,
+# attacker.intel.enriched, identity.formed, identity.merged,
+# credential.reuse.detected, email.received, and canary.> ; falls back
+# to a 60s slow-tick poll when the bus is idle or unavailable. Each
+# event is dispatched through the CompositeTagger (RuleEngine +
+# Behavioral / Intel / Email / CanaryFingerprint / Identity /
+# Credential lifters), persisted via the idempotent INSERT OR IGNORE
+# repo write, and ttp.tagged + ttp.rule.fired.<technique_id> are
+# published only when the insert returned a non-zero rowcount
+# (loop-prevention invariant — see TTP_TAGGING.md §"Bus topics").
+#
+# Master-only: gated via MASTER_ONLY_COMMANDS in decnet/cli/gating.py.
+# Sits one layer above the identity / intel / reuse-correlator
+# workers — the After= dependencies ensure their bus topics are live
+# before the TTP worker subscribes.
+ExecStart={{ venv_dir }}/bin/decnet ttp
+StandardOutput=append:/var/log/decnet/decnet.ttp.log
+StandardError=append:/var/log/decnet/decnet.ttp.log
+
+CapabilityBoundingSet=
+AmbientCapabilities=
+
+# Security Hardening
+NoNewPrivileges=yes
+ProtectSystem=full
+# Dev installs under /home need ProtectHome=read-only (the worker
+# reads ./rules/ttp/ from the project root, which lives under /home
+# on dev boxes — read-only suffices because the FilesystemRuleStore
+# only reads YAMLs, never writes).
+ProtectHome=read-only
+PrivateTmp=yes
+ProtectKernelTunables=yes
+ProtectKernelModules=yes
+ProtectControlGroups=yes
+RestrictSUIDSGID=yes
+LockPersonality=yes
+ReadWritePaths={{ install_dir }} /var/log/decnet
+
+Restart=on-failure
+RestartSec=5
+TimeoutStopSec=15
+
+[Install]
+WantedBy=multi-user.target
diff --git a/deploy/decnet.target b/deploy/decnet.target
index 409b831c..71f0b25f 100644
--- a/deploy/decnet.target
+++ b/deploy/decnet.target
@@ -18,6 +18,7 @@ Wants=decnet-bus.service \
       decnet-enrich.service \
       decnet-clusterer.service \
       decnet-campaign-clusterer.service \
+      decnet-ttp.service \
       decnet-webhook.service \
       decnet-canary.service \
       decnet-orchestrator.service
diff --git a/development/TTP_TAGGING.md b/development/TTP_TAGGING.md
index f9baf255..fa3d5e62 100644
--- a/development/TTP_TAGGING.md
+++ b/development/TTP_TAGGING.md
@@ -3050,6 +3050,14 @@ Order:
     deferred to E.3.14b — today the worker is 1:1 source-kind →
     lifter; the catch-up rewrite needs a session→intel join the
     repo doesn't expose yet.
+    Worker registration: `decnet ttp` CLI command lands in
+    `decnet/cli/workers.py` (master-only, gated through
+    `MASTER_ONLY_COMMANDS` in `decnet/cli/gating.py`); the
+    rendered systemd unit at `deploy/decnet-ttp.service.j2`
+    sits one layer above the identity / intel / reuse-correlator
+    workers via `After=` deps and is included in
+    `deploy/decnet.target`. `ProtectHome=read-only` suffices —
+    FilesystemRuleStore only reads `./rules/ttp/`.
 15. **UKC bridge** — implement `tactic_to_ukc_phase` and inverse.
     Rewrite the campaign clusterer's
     `IdentityFeatures.commands_by_phase_on_decky` adapter to read
@@ -3087,7 +3095,19 @@ Order:
     `tsc --noEmit` + `vite build` clean.
 17. **Schemathesis pass** — full API fuzz including the new TTP
     routes. Document any new 4xx codes per the project's
-    "POST/PUT/PATCH 400" convention.
+    "POST/PUT/PATCH 400" convention. ✅ done.
+    `POST /ttp/rules/{rule_id}/state` already documents 400
+    (manual-parse for malformed JSON, per
+    `feedback_schemathesis_400.md`); the GET rollups
+    (by-identity / by-attacker / by-campaign / by-session /
+    techniques / rules / export-navigator{,/identity})
+    uniformly document 401 + 403 per the auth-gated convention.
+    `wiki-checkout/Service-Bus.md` updated to flip the TTP
+    worker topics from "_reserved (TTP worker)_" to actual
+    publisher attribution (`decnet.ttp.worker`) now that the
+    worker bootstrap publishes them. Suppression-event publish
+    stays deferred per the v0 contract — the repo drops
+    sub-floor confidence directly, no bus event.
 
 ### E.4 Out-of-band tasks (not gated on the above)
 
diff --git a/tests/api/test_schemathesis_ttp.py b/tests/api/test_schemathesis_ttp.py
new file mode 100644
index 00000000..1b789af8
--- /dev/null
+++ b/tests/api/test_schemathesis_ttp.py
@@ -0,0 +1,87 @@
+"""Schemathesis contract tests scoped to the TTP Tagging API surface.
+
+E.3.17 of ``development/TTP_TAGGING.md``. The full ``test_schemathesis``
+suite fuzzes every endpoint with ``max_examples=3000`` — slow and
+overkill when iterating on TTP-routes-only changes (E.3.13–E.3.16).
+This file filters by the OpenAPI ``tags=["TTP Tagging"]`` annotation
+the eight TTP routes carry, runs against the same live uvicorn
+subprocess the wider suite spins up, and applies the same check
+battery so a 4xx-shape regression on a TTP route fails here without
+waiting on the rest of the API.
+
+Routes covered (all decorated ``tags=["TTP Tagging"]``):
+
+* ``GET    /api/v1/ttp/techniques``
+* ``GET    /api/v1/ttp/by-identity/{identity_uuid}``
+* ``GET    /api/v1/ttp/by-attacker/{attacker_uuid}``
+* ``GET    /api/v1/ttp/by-campaign/{campaign_uuid}``
+* ``GET    /api/v1/ttp/by-session/{session_id}``
+* ``GET    /api/v1/ttp/rules``
+* ``POST   /api/v1/ttp/rules/{rule_id}/state``
+* ``DELETE /api/v1/ttp/rules/{rule_id}/state``
+* ``GET    /api/v1/ttp/export/navigator``
+* ``GET    /api/v1/ttp/export/navigator/identity/{identity_uuid}``
+"""
+from __future__ import annotations
+
+import pytest
+import schemathesis as st
+from hypothesis import HealthCheck, Verbosity, settings
+
+from tests.api.test_schemathesis import (
+    ALL_CHECKS,
+    AUTH_CHECKS,
+    LIVE_SERVER_URL,
+    before_call as _shared_before_call,  # noqa: F401  (registers @st.hook)
+)
+
+# Reuse the schema fetched against the same uvicorn subprocess started
+# by ``test_schemathesis``. Filtering by tag keeps the TTP suite a
+# fast, focused contract gate without re-spinning the server.
+TTP_SCHEMA = st.openapi.from_url(
+    f"{LIVE_SERVER_URL}/openapi.json",
+).include(tag="TTP Tagging")
+
+
+@pytest.mark.fuzz
+@TTP_SCHEMA.parametrize()
+@settings(
+    max_examples=400,
+    deadline=None,
+    verbosity=Verbosity.normal,
+    suppress_health_check=[
+        HealthCheck.filter_too_much,
+        HealthCheck.too_slow,
+        HealthCheck.data_too_large,
+    ],
+)
+def test_ttp_schema_compliance(case):
+    """Per-TTP-route schema compliance — valid + invalid inputs."""
+    case.call_and_validate(checks=ALL_CHECKS)
+
+
+@pytest.mark.fuzz
+@TTP_SCHEMA.parametrize()
+@settings(
+    max_examples=120,
+    deadline=None,
+    verbosity=Verbosity.normal,
+    suppress_health_check=[
+        HealthCheck.filter_too_much,
+        HealthCheck.too_slow,
+    ],
+)
+def test_ttp_auth_enforcement(case):
+    """Every TTP route rejects requests without a Bearer token (401).
+
+    The mutation endpoints additionally require ``admin`` (server-side
+    ``require_admin``); the authless probe doesn't distinguish 401 vs
+    403 here — the ``ignored_auth`` check just asserts that an absent
+    token never lands the request inside the handler with a usable
+    identity.
+    """
+    case.headers = {
+        k: v for k, v in (case.headers or {}).items()
+        if k.lower() != "authorization"
+    }
+    case.call_and_validate(checks=AUTH_CHECKS)