diff --git a/docs/architecture/jenkins-readonly-build-status-design.md b/docs/architecture/jenkins-readonly-build-status-design.md
index bc5eff1..eef28ae 100644
--- a/docs/architecture/jenkins-readonly-build-status-design.md
+++ b/docs/architecture/jenkins-readonly-build-status-design.md
@@ -5,7 +5,7 @@
 - **Related:** #77 (repo/branch/PR → job mapping, designed separately)
 - **Date:** 2026-07-02
 
-Note on naming: This design used historical `jenkins-readonly` skill name in Gitea-Tools. Actual package/server is `jenkins-mcp` (see mcp-control-plane registration in #55). The server boundary now contains gated trigger (see #56), but read tools remain as designed.
+Note on naming: This design used historical `jenkins-readonly` skill name in Gitea-Tools. Actual package/server is `jenkins-mcp` (see mcp-control-plane registration in #55). The read server boundary remains read-only; gated triggers live on the separate `jenkins-write-mcp` / `jenkins_mcp.write_server` boundary (see #56 / #152).
 Client registration and reload instructions live in
 [`../mcp-client-registration.md`](../mcp-client-registration.md).
 
@@ -18,7 +18,9 @@ detail (build URL, number, timing, result) to report or investigate.
 Phase 1 is **primarily read-only**, per ADR-0001
 ([`adr-0001-mcp-control-plane-boundaries.md`](adr-0001-mcp-control-plane-boundaries.md)):
 
-- Build triggers are gated behind dedicated profile + exact confirmation (landed in #4, boundary correction in #56).
+- Build triggers are outside this read-only surface and require the separate
+  `jenkins-write-mcp` boundary, a dedicated profile, exact confirmation, and
+  fail-closed mutation audit (landed in #4, boundary correction in #56 / #152).
 - **Excluded: deploy triggers.**
 - **Excluded: parameterized job launches.**
 - Excluded: job creation/deletion/config changes, queue manipulation, node
@@ -109,7 +111,7 @@ by #76):
   `forbidden_operations: ["jenkins.build.trigger", "jenkins.deploy", "jenkins.job.configure"]`
   as belt-and-braces even though no mutating tool exists.
 - Missing URL/user/token/profile ⇒ **fail closed** with a clear message.
-- Since every tool is read-only, no confirmation gates are needed — but
+- Since every tool on `jenkins-mcp` is read-only, no confirmation gates are needed — but
   identity (`jenkins_whoami`) must still work so workflows can prove which
   Jenkins account they act as.
 
diff --git a/docs/mcp-client-registration.md b/docs/mcp-client-registration.md
index 049e57b..e83d5f3 100644
--- a/docs/mcp-client-registration.md
+++ b/docs/mcp-client-registration.md
@@ -9,9 +9,14 @@ Use these exact MCP server names in clients:
 
 | Server name | Boundary | Default capability |
 |---|---|---|
-| `jenkins-mcp` | Jenkins CI inspection | Read-only build/job inspection |
+| `jenkins-mcp` | Jenkins CI inspection (read) | Read-only build/job inspection |
+| `jenkins-write-mcp` | Jenkins build trigger (write) | Gated `jenkins_trigger_build` only |
 | `glitchtip-mcp` | GlitchTip observability inspection | Read-only issue/event inspection |
 
+The write boundary (`jenkins-write-mcp`) is **not** registered by default (#152).
+It exposes a single mutating tool and requires operator approval of a dedicated
+trigger profile before any client config references it.
+
 Historical names such as `jenkins-readonly` and `glitchtip-readonly` are
 descriptive profile labels only. They are not the canonical MCP server names
 unless an operator intentionally creates aliases and documents them.
@@ -54,7 +59,7 @@ entry, reconnect or reload the MCP client before claiming the tools are usable.
 Before using either server in a task, prove the expected tools are visible in
 the client. It is not enough for the config entry to exist.
 
-Expected Jenkins tools:
+Expected Jenkins read tools (`jenkins-mcp` only):
 
 - `jenkins_whoami`
 - `jenkins_list_jobs`
@@ -62,6 +67,10 @@ Expected Jenkins tools:
 - `jenkins_build_status`
 - `jenkins_get_build`
 
+`jenkins_trigger_build` must **not** appear on `jenkins-mcp`. When an operator
+explicitly enables the write boundary, the only expected tool on
+`jenkins-write-mcp` is `jenkins_trigger_build`.
+
 Expected GlitchTip tools:
 
 - `glitchtip_whoami`
@@ -78,8 +87,13 @@ back to shell commands, raw service APIs, or unrelated MCP servers.
 ## Boundary Rules
 
 - `jenkins-mcp` read profiles must not expose build trigger tools.
-- Jenkins build triggers require a separately named write profile, exact
-  confirmation, and fail-closed mutation audit.
+- Build triggers live on the separate `jenkins-write-mcp` server
+  (`jenkins_mcp.write_server`), not on `jenkins-mcp`.
+- Jenkins build triggers require a dedicated trigger profile with
+  `jenkins.build.trigger` allowed, exact confirmation
+  (`TRIGGER BUILD <job-path>`), and fail-closed mutation audit.
+- Do not register `jenkins-write-mcp` until an operator approves a trigger
+  profile; no shipped profile carries trigger capability by default.
 - `glitchtip-mcp` remains read-only. It must not file or mutate Gitea issues.
 - GlitchTip-to-Gitea filing is a separate orchestrator that composes GlitchTip
   read tools with Gitea issue-write tools.
diff --git a/docs/safety-model.md b/docs/safety-model.md
index fb9b92b..1f80b51 100644
--- a/docs/safety-model.md
+++ b/docs/safety-model.md
@@ -21,5 +21,10 @@ Note on naming: Historical design docs used `jenkins-readonly` / `glitchtip-read
 
 ## 5. Mutation Gating
 Any mutating action (e.g., Gitea issue creation from GlitchTip, or Jenkins builds) must be explicitly allowed by the execution profile.
-- **Jenkins build triggers** exist in jenkins-mcp (landed #4) but require dedicated profile/identity and exact confirmation; not on standard reader profiles. See #56 for boundary correction.
-- **GlitchTip to Gitea issue filing** is documented as a gated, orchestrated workflow (not in glitchtip-mcp), currently partial (mocked, dedup not wired, audit missing). See #57.
+- **Jenkins build triggers** are gated on a separate write boundary
+  (`jenkins-write-mcp` / `jenkins_mcp.write_server`), not on the read-only
+  `jenkins-mcp` surface. Triggers require a dedicated profile with
+  `jenkins.build.trigger`, exact confirmation, and fail-closed mutation audit.
+  No default profile carries trigger capability (#152 / mcp-control-plane #56).
+- **GlitchTip to Gitea issue filing** is a library-only orchestrator in
+  mcp-control-plane (not on `glitchtip-mcp`). See #153 / mcp-control-plane #57.
diff --git a/tests/test_external_mcp_registration_docs.py b/tests/test_external_mcp_registration_docs.py
index c14bc52..40c8eba 100644
--- a/tests/test_external_mcp_registration_docs.py
+++ b/tests/test_external_mcp_registration_docs.py
@@ -1,4 +1,4 @@
-"""Documentation checks for external Jenkins/GlitchTip MCP registration (#151)."""
+"""Documentation checks for external Jenkins/GlitchTip MCP registration (#151/#152)."""
 from pathlib import Path
 
 REPO_ROOT = Path(__file__).resolve().parent.parent
@@ -52,11 +52,20 @@ def test_registration_doc_preserves_boundaries():
         "Do not add Jenkins or GlitchTip credentials to the Gitea MCP server",
         "do not add Gitea write credentials to the GlitchTip server",
         "must not expose build trigger tools",
+        "jenkins-write-mcp",
+        "jenkins_mcp.write_server",
         "remains read-only",
     ):
         assert phrase in text
 
 
+def test_registration_doc_separates_jenkins_trigger_from_read_surface():
+    text = _doc_text()
+    assert "jenkins_trigger_build" in text
+    assert "must **not** appear on `jenkins-mcp`" in text
+    assert "not" in text.lower() and "registered by default" in text.lower()
+
+
 def test_registration_doc_has_no_secret_material_or_live_urls():
     text = _doc_text()
     for marker in (
@@ -80,3 +89,14 @@ def test_related_docs_link_registration_doc():
         text = (REPO_ROOT / name).read_text(encoding="utf-8")
         assert "mcp-client-registration.md" in text, (
             f"{name} does not link docs/mcp-client-registration.md")
+
+
+def test_related_docs_keep_jenkins_trigger_off_read_surface():
+    for name in (
+        "docs/safety-model.md",
+        "docs/architecture/jenkins-readonly-build-status-design.md",
+    ):
+        text = (REPO_ROOT / name).read_text(encoding="utf-8")
+        assert "jenkins-write-mcp" in text
+        assert "jenkins_mcp.write_server" in text
+        assert "jenkins-mcp" in text