diff --git a/docsgpt/agents/tools/wiki.py b/docsgpt/agents/tools/wiki.py
index 372532f8..6cb00a68 100644
--- a/docsgpt/agents/tools/wiki.py
+++ b/docsgpt/agents/tools/wiki.py
@@ -3,6 +3,7 @@ from typing import Any, Dict, List, Optional
 
 from docsgpt.agents.tools.base import Tool
 from docsgpt.agents.tools.path_utils import validate_tool_path
+from docsgpt.storage.db.repositories.sources import SourcesRepository
 from docsgpt.storage.db.repositories.wiki_pages import (
     WikiPageConflict,
     WikiPagesRepository,
@@ -21,6 +22,11 @@ MAX_WIKI_PAGE_BYTES = 1_000_000
 
 _WRITE_ACTIONS = frozenset({"create", "str_replace", "insert", "delete", "rename"})
 
+OUTSIDE_EDITS_DENIED = (
+    "Error: This wiki's owner doesn't let API, widget or public-link users edit it, "
+    "so it can't be changed from here. You can still read it."
+)
+
 
 class WikiTool(Tool):
     """Wiki
@@ -39,6 +45,9 @@ class WikiTool(Tool):
         self.config = config
         self.source_id: Optional[str] = config.get("source_id")
         self.source_owner_id: Optional[str] = config.get("source_owner_id")
+        # An API-key, widget or public-link run: it writes only while the
+        # wiki's owner allows such edits.
+        self.outside_caller: bool = bool(config.get("outside_caller"))
         decoded_token = config.get("decoded_token") or {}
         self.updated_by: Optional[str] = (
             (decoded_token.get("sub") if decoded_token else None)
@@ -228,8 +237,30 @@ class WikiTool(Tool):
             return message
         if access is None or not access.can("edit"):
             return message
+        if self.outside_caller and not self._outside_edits_allowed():
+            return OUTSIDE_EDITS_DENIED
         return None
 
+    def _outside_edits_allowed(self) -> bool:
+        """Read the wiki's live ``wiki_outside_edits`` setting.
+
+        Read on every write rather than trusted from the run's setup, so the
+        owner turning it off stops a conversation that is already going.
+        Fails closed on a missing row or a failed lookup.
+
+        Returns:
+            bool: Whether an API, widget or public-link run may edit the wiki.
+        """
+        try:
+            with db_readonly() as conn:
+                row = SourcesRepository(conn).get_by_id(str(self.source_id))
+        except Exception:
+            logger.exception(
+                "Wiki outside-edits check failed for source %s", self.source_id
+            )
+            return False
+        return outside_edits_allowed(row)
+
     def get_config_requirements(self) -> Dict[str, Any]:
         return {}
 
@@ -500,11 +531,17 @@ class WikiTool(Tool):
         return f"Renamed: {validated_old} -> {validated_new}"
 
 
-def build_wiki_tool_entry() -> Dict[str, Any]:
-    """Build the synthetic tools_dict entry for the WikiTool."""
+def build_wiki_tool_entry(writes_allowed: bool = True) -> Dict[str, Any]:
+    """Build the synthetic tools_dict entry for the WikiTool.
+
+    Args:
+        writes_allowed: False offers the model only ``wiki_view``.
+    """
     entry = {"name": "wiki"}
     entry["actions"] = [
-        {**action, "active": True} for action in _wiki_actions_metadata()
+        {**action, "active": True}
+        for action in _wiki_actions_metadata()
+        if writes_allowed or action["name"] == "wiki_view"
     ]
     return entry
 
@@ -513,11 +550,17 @@ def _wiki_actions_metadata() -> List[Dict[str, Any]]:
     return WikiTool().get_actions_metadata()
 
 
+def outside_edits_allowed(source_row: Optional[Dict[str, Any]]) -> bool:
+    """Whether a wiki's owner lets API, widget and public-link runs edit it."""
+    return bool(source_row and source_row.get("wiki_outside_edits"))
+
+
 def build_wiki_tool_config(
     source_id: str,
     source_owner_id: str,
     decoded_token: Optional[Dict] = None,
     user: Optional[str] = None,
+    outside_caller: bool = False,
 ) -> Dict[str, Any]:
     """Build the config dict passed to the injected WikiTool."""
     return {
@@ -525,6 +568,7 @@ def build_wiki_tool_config(
         "source_owner_id": source_owner_id,
         "decoded_token": decoded_token,
         "user": user,
+        "outside_caller": bool(outside_caller),
     }
 
 
@@ -534,15 +578,19 @@ def add_wiki_tool(tools_dict: Dict, config: Dict) -> None:
     Mirrors ``add_internal_search_tool``: the entry carries ``id=WIKI_TOOL_ID``
     so the executor can resolve the synthetic (DB-rowless) tool, and a ``config``
     the executor copies into the loaded tool. Mutates ``tools_dict`` in place.
+    ``writes_allowed=False`` (an API, widget or public-link run on a wiki
+    whose owner hasn't allowed their edits) offers only ``wiki_view``; the
+    tool still refuses writes itself from ``outside_caller``.
     """
     if not config or not config.get("source_id") or not config.get("source_owner_id"):
         return
-    entry = build_wiki_tool_entry()
+    entry = build_wiki_tool_entry(writes_allowed=config.get("writes_allowed", True) is not False)
     entry["id"] = WIKI_TOOL_ID
     entry["config"] = build_wiki_tool_config(
         source_id=config["source_id"],
         source_owner_id=config["source_owner_id"],
         decoded_token=config.get("decoded_token"),
         user=config.get("user"),
+        outside_caller=bool(config.get("outside_caller")),
     )
     tools_dict[WIKI_TOOL_ID] = entry
diff --git a/docsgpt/alembic/versions/0043_wiki_outside_edits.py b/docsgpt/alembic/versions/0043_wiki_outside_edits.py
new file mode 100644
index 00000000..9975de63
--- /dev/null
+++ b/docsgpt/alembic/versions/0043_wiki_outside_edits.py
@@ -0,0 +1,33 @@
+"""0043 wiki outside edits — the wiki owner's say on API, widget and public-link edits.
+
+An agent run from its API key or widget acts as the agent's owner, and a
+public-link user is a stranger to them, so neither should rewrite a wiki the
+agent can edit unless the wiki's owner allows it. ``wiki_outside_edits``
+records that choice on the source; it is off by default, so such runs can
+still read the wiki but not change it.
+
+Idempotent both ways.
+
+Revision ID: 0043_wiki_outside_edits
+Revises: 0042_schedule_created_via_api
+"""
+
+from typing import Sequence, Union
+
+from alembic import op
+
+
+revision: str = "0043_wiki_outside_edits"
+down_revision: Union[str, None] = "0042_schedule_created_via_api"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.execute(
+        "ALTER TABLE sources ADD COLUMN IF NOT EXISTS wiki_outside_edits BOOLEAN NOT NULL DEFAULT false;"
+    )
+
+
+def downgrade() -> None:
+    op.execute("ALTER TABLE sources DROP COLUMN IF EXISTS wiki_outside_edits;")
diff --git a/docsgpt/api/answer/services/stream_processor.py b/docsgpt/api/answer/services/stream_processor.py
index 2ce88a70..1c783489 100644
--- a/docsgpt/api/answer/services/stream_processor.py
+++ b/docsgpt/api/answer/services/stream_processor.py
@@ -27,6 +27,7 @@ from docsgpt.core.model_utils import (
     get_provider_from_model_id,
     validate_model_id,
 )
+from docsgpt.agents.tools.wiki import outside_edits_allowed
 from docsgpt.core.settings import settings
 from docsgpt.guardrails.config import AgentConfig
 from sqlalchemy import text as sql_text
@@ -1259,10 +1260,22 @@ class StreamProcessor:
         writable wiki source; the first match wins and the scan stops there so
         this runs at most one owner+source lookup per chat on the hot path.
         Returns None when no writable wiki source is present.
+
+        An API-key, widget or public-link run (``outside_caller``) gets the
+        edit actions only when the wiki's owner turned on
+        ``wiki_outside_edits``; otherwise ``writes_allowed`` is False and the
+        tool offers only ``wiki_view``.
         """
         caller = self.decoded_token.get("sub") if self.decoded_token else None
         if not caller:
             return None
+        # Processors built without __init__ (tests, resume helpers) lack these.
+        run_config = getattr(self, "agent_config", None) or {}
+        outside_caller = bool(
+            run_config.get("external_api_caller")
+            or run_config.get("public_link_caller")
+            or getattr(self, "external_caller", False)
+        )
 
         wiki_config: Optional[Dict[str, Any]] = None
         try:
@@ -1286,6 +1299,8 @@ class StreamProcessor:
                         "source_owner_id": owner,
                         "decoded_token": self.decoded_token,
                         "user": caller,
+                        "outside_caller": outside_caller,
+                        "writes_allowed": not outside_caller or outside_edits_allowed(source_doc),
                     }
                     break
         except Exception:
diff --git a/docsgpt/api/pat/rules.py b/docsgpt/api/pat/rules.py
index 4af3d484..afb2b0bd 100644
--- a/docsgpt/api/pat/rules.py
+++ b/docsgpt/api/pat/rules.py
@@ -224,6 +224,7 @@ RULES: dict[tuple[str, str], Rule] = {
     ("/api/get_chunks", "GET"): _rule("sources:read", (QUERY, "id")),
     ("/api/sources/<string:source_id>/wiki/pages", "GET"): _rule("sources:read", (VIEW, "source_id")),
     ("/api/sources/<string:source_id>/wiki/page", "GET"): _rule("sources:read", (VIEW, "source_id")),
+    ("/api/sources/<string:source_id>/wiki/settings", "GET"): _rule("sources:read", (VIEW, "source_id")),
     ("/api/sources/<string:source_id>/graph", "GET"): _rule("sources:read", (VIEW, "source_id")),
     ("/api/sources/<string:source_id>/graph/node/<string:node_id>", "GET"): _rule(
         "sources:read", (VIEW, "source_id")
@@ -357,6 +358,8 @@ DENIED: dict[str, tuple[str, ...]] = {
     "/api/teams/<string:team_id>/grants": ("POST", "DELETE"),
     "/api/teams/<string:team_id>/transfer_owner": ("*",),
     "/api/resource_settings": ("PUT",),
+    # Who may edit a wiki from outside the app is the owner's call in a session.
+    "/api/sources/<string:source_id>/wiki/settings": ("PUT",),
     "/swagger.json": ("*",),
 }
 DENIED_PREFIXES = (
diff --git a/docsgpt/api/user/sources/routes.py b/docsgpt/api/user/sources/routes.py
index 639b4533..e66db1a6 100644
--- a/docsgpt/api/user/sources/routes.py
+++ b/docsgpt/api/user/sources/routes.py
@@ -1056,6 +1056,87 @@ class WikiPage(Resource):
         )
 
 
+def _wiki_settings_body(doc: dict, ra) -> dict:
+    """The wiki settings response: the stored switch plus the caller's access."""
+    return {
+        "success": True,
+        "allow_outside_edits": bool(doc.get("wiki_outside_edits")),
+        **ra.payload(),
+    }
+
+
+@sources_ns.route("/sources/<string:source_id>/wiki/settings")
+class WikiSettings(Resource):
+    @api.doc(
+        description="A wiki's settings. Anyone who can see the wiki may read "
+        "them; returns allow_outside_edits plus the caller's access."
+    )
+    def get(self, source_id):
+        decoded_token = request.decoded_token
+        if not decoded_token:
+            return make_response(jsonify({"success": False}), 401)
+        user = decoded_token.get("sub")
+        try:
+            with db_readonly() as conn:
+                try:
+                    doc, ra = load_source(conn, source_id, user, "use")
+                except AccessDenied as err:
+                    return denied_response(err)
+        except Exception as err:
+            current_app.logger.error(
+                f"Error reading wiki settings for {source_id}: {err}", exc_info=True
+            )
+            return make_response(jsonify({"success": False}), 400)
+        return make_response(jsonify(_wiki_settings_body(doc, ra)), 200)
+
+    @api.doc(
+        description="Change a wiki's settings (owner only, manage_settings). "
+        "Body: {\"allow_outside_edits\": bool}: whether runs from the agent's "
+        "API key, widget or public link may edit the wiki."
+    )
+    def put(self, source_id):
+        decoded_token = request.decoded_token
+        if not decoded_token:
+            return make_response(jsonify({"success": False}), 401)
+        user = decoded_token.get("sub")
+        data = request.get_json(silent=True) or {}
+        allowed = data.get("allow_outside_edits")
+        if not isinstance(allowed, bool):
+            return make_response(
+                jsonify(
+                    {"success": False, "message": "allow_outside_edits must be true or false"}
+                ),
+                400,
+            )
+        try:
+            with db_session() as conn:
+                try:
+                    doc, ra = load_source(conn, source_id, user, "manage_settings")
+                except AccessDenied as err:
+                    return denied_response(err)
+                if SourceConfig.parse(doc.get("config")).kind != "wiki":
+                    return make_response(
+                        jsonify({"success": False, "message": "Source is not a wiki"}), 400
+                    )
+                SourcesRepository(conn).set_wiki_outside_edits(
+                    str(doc["id"]), ra.owner_id, allowed
+                )
+                record_event(
+                    conn,
+                    "source.wiki_settings_updated",
+                    actor=user,
+                    source_id=str(doc["id"]),
+                    allow_outside_edits=allowed,
+                )
+                doc["wiki_outside_edits"] = allowed
+        except Exception as err:
+            current_app.logger.error(
+                f"Error updating wiki settings for {source_id}: {err}", exc_info=True
+            )
+            return make_response(jsonify({"success": False}), 400)
+        return make_response(jsonify(_wiki_settings_body(doc, ra)), 200)
+
+
 def _source_is_blank(doc):
     """True when a source has no ingested files to convert into pages."""
     structure = doc.get("directory_structure") or {}
diff --git a/docsgpt/storage/db/models.py b/docsgpt/storage/db/models.py
index 0decb61f..992af0a1 100644
--- a/docsgpt/storage/db/models.py
+++ b/docsgpt/storage/db/models.py
@@ -381,6 +381,8 @@ sources_table = Table(
     ),
     # Whose account a shared resource runs with: the owner's, or each member's.
     Column("credential_mode", Text, nullable=False, server_default="owner"),
+    # A wiki's owner lets API, widget and public-link runs edit it (off: read only).
+    Column("wiki_outside_edits", Boolean, nullable=False, server_default="false"),
 )
 
 agents_table = Table(
diff --git a/docsgpt/storage/db/repositories/sources.py b/docsgpt/storage/db/repositories/sources.py
index 2406af23..ca5e7236 100644
--- a/docsgpt/storage/db/repositories/sources.py
+++ b/docsgpt/storage/db/repositories/sources.py
@@ -399,6 +399,30 @@ class SourcesRepository:
         )
         self._conn.execute(stmt)
 
+    def set_wiki_outside_edits(self, source_id: str, user_id: str, allowed: bool) -> bool:
+        """Record whether API, widget and public-link runs may edit this wiki.
+
+        Kept out of :meth:`update`'s columns so no route that forwards a
+        request body can change it; only the owner-checked wiki settings
+        route calls this.
+
+        Args:
+            source_id: The source's UUID.
+            user_id: The owner's id; the row is scoped to it.
+            allowed: The new value.
+
+        Returns:
+            bool: Whether a row was updated.
+        """
+        t = sources_table
+        result = self._conn.execute(
+            t.update()
+            .where(t.c.id == source_id)
+            .where(t.c.user_id == user_id)
+            .values(wiki_outside_edits=bool(allowed), updated_at=func.now())
+        )
+        return result.rowcount > 0
+
     def get_by_legacy_id(
         self, legacy_mongo_id: str, user_id: Optional[str] = None,
     ) -> Optional[dict]:
diff --git a/tests/agents/test_headless_runner_callers.py b/tests/agents/test_headless_runner_callers.py
index 7c67f665..6305e717 100644
--- a/tests/agents/test_headless_runner_callers.py
+++ b/tests/agents/test_headless_runner_callers.py
@@ -11,7 +11,7 @@ from unittest.mock import MagicMock, patch
 import pytest
 
 
-def _executor_kwargs(monkeypatch, config_extra=None, **run_kwargs):
+def _executor_kwargs(monkeypatch, config_extra=None, agent_kwargs=None, **run_kwargs):
     from docsgpt.agents import headless_runner as hr
 
     agent = MagicMock(name="agent")
@@ -27,7 +27,12 @@ def _executor_kwargs(monkeypatch, config_extra=None, **run_kwargs):
     monkeypatch.setattr(hr, "get_prompt", lambda _pid: "system prompt")
     monkeypatch.setattr(hr.RetrieverCreator, "create_retriever", classmethod(lambda cls, *a, **kw: retriever))
     monkeypatch.setattr(hr, "ToolExecutor", _executor)
-    monkeypatch.setattr(hr.AgentCreator, "create_agent", classmethod(lambda cls, *a, **kw: agent))
+    def _create_agent(cls, *_args, **kwargs):
+        if agent_kwargs is not None:
+            agent_kwargs.update(kwargs)
+        return agent
+
+    monkeypatch.setattr(hr.AgentCreator, "create_agent", classmethod(_create_agent))
     monkeypatch.setattr(hr.QuotaService, "check", lambda *a, **kw: None)
     config = {"user_id": "u1", "id": "agent-1", "default_model_id": "m", **(config_extra or {})}
     with patch("docsgpt.core.model_utils.validate_model_id", return_value=True), \
@@ -51,3 +56,12 @@ class TestHeadlessCallerRules:
         kwargs = _executor_kwargs(monkeypatch, config, **{flag: True})
         assert kwargs[flag] is True
         assert kwargs["api_write_allowlist"] == ["tool-1:send"]
+
+    @pytest.mark.parametrize("flag", ["external_caller", "public_link_caller"])
+    def test_outside_caller_run_gets_no_wiki_editor(self, monkeypatch, flag):
+        # A scheduled or webhook run has no wiki tool at all, so an outside
+        # caller's schedule can't edit a wiki whatever the wiki allows.
+        agent_kwargs = {}
+        _executor_kwargs(monkeypatch, agent_kwargs=agent_kwargs, **{flag: True})
+        assert agent_kwargs
+        assert "wiki_config" not in agent_kwargs
diff --git a/tests/agents/tools/test_wiki.py b/tests/agents/tools/test_wiki.py
index a830b5be..6d23b878 100644
--- a/tests/agents/tools/test_wiki.py
+++ b/tests/agents/tools/test_wiki.py
@@ -640,3 +640,154 @@ class TestBuildAgentGating:
         assert cfg is not None
         # v1 binds the first writable wiki source; the extra is skipped.
         assert cfg["source_id"] == "wiki-1"
+
+
+# =====================================================================
+# API, widget and public-link callers (the wiki's outside-edits setting)
+# =====================================================================
+
+
+def _outside_tool(monkeypatch, allowed):
+    from docsgpt.agents.tools.wiki import WikiTool
+
+    class _Sources:
+        def __init__(self, conn):
+            pass
+
+        def get_by_id(self, sid):
+            return {"id": sid, "wiki_outside_edits": allowed}
+
+    monkeypatch.setattr("docsgpt.agents.tools.wiki.SourcesRepository", _Sources)
+    return WikiTool(
+        {
+            "source_id": "src-1",
+            "source_owner_id": "owner-sub",
+            "decoded_token": {"sub": "owner-sub"},
+            "user": "owner-sub",
+            "outside_caller": True,
+        }
+    )
+
+
+_WRITES = (
+    ("create", {"path": "/b.md", "content": "x"}),
+    ("str_replace", {"path": "/a.md", "old_str": "one", "new_str": "two"}),
+    ("insert", {"path": "/a.md", "insert_line": 1, "insert_text": "x"}),
+    ("delete", {"path": "/a.md"}),
+    ("rename", {"old_path": "/a.md", "new_path": "/c.md"}),
+)
+
+
+@pytest.mark.unit
+class TestOutsideCallerWrites:
+    def test_refused_while_the_setting_is_off(self, patched_wiki, monkeypatch, reembed_mock):
+        _FakeWikiRepo().upsert("src-1", "/a.md", "one")
+        tool = _outside_tool(monkeypatch, False)
+        for action, kwargs in _WRITES:
+            result = tool.execute_action(action, **kwargs)
+            assert "API, widget or public-link" in result, action
+        reembed_mock.assert_not_called()
+        assert _FakeWikiRepo().get_by_path("src-1", "/a.md")["content"] == "one"
+        # Reading stays open to them.
+        assert "one" in tool.execute_action("view", path="/a.md")
+
+    def test_allowed_once_the_owner_turns_it_on(self, patched_wiki, monkeypatch):
+        tool = _outside_tool(monkeypatch, True)
+        assert tool.execute_action("create", path="/b.md", content="x") == "Page created: /b.md"
+
+    def test_a_missing_row_refuses(self, patched_wiki, monkeypatch):
+        tool = _outside_tool(monkeypatch, True)
+
+        class _Gone:
+            def __init__(self, conn):
+                pass
+
+            def get_by_id(self, sid):
+                return None
+
+        monkeypatch.setattr("docsgpt.agents.tools.wiki.SourcesRepository", _Gone)
+        assert "API, widget or public-link" in tool.execute_action("create", path="/b.md", content="x")
+
+    def test_owner_and_team_runs_skip_the_setting(self, wiki_tool, monkeypatch):
+        class _Boom:
+            def __init__(self, conn):
+                raise AssertionError("an in-app run must not read the setting")
+
+        monkeypatch.setattr("docsgpt.agents.tools.wiki.SourcesRepository", _Boom)
+        assert wiki_tool.execute_action("create", path="/b.md", content="x") == "Page created: /b.md"
+
+
+@pytest.mark.unit
+class TestReadOnlyEntry:
+    def _entry(self, **extra):
+        from docsgpt.agents.tools.wiki import WIKI_TOOL_ID, add_wiki_tool
+
+        tools_dict = {}
+        add_wiki_tool(tools_dict, {"source_id": "s1", "source_owner_id": "owner", "user": "owner", **extra})
+        return tools_dict[WIKI_TOOL_ID]
+
+    def test_outside_caller_without_the_setting_is_offered_only_view(self):
+        entry = self._entry(outside_caller=True, writes_allowed=False)
+        assert [a["name"] for a in entry["actions"]] == ["wiki_view"]
+        assert entry["config"]["outside_caller"] is True
+
+    def test_writes_offered_when_allowed(self):
+        entry = self._entry(outside_caller=True, writes_allowed=True)
+        names = {a["name"] for a in entry["actions"]}
+        assert {"wiki_view", "wiki_create", "wiki_str_replace", "wiki_delete"} <= names
+        assert entry["config"]["outside_caller"] is True
+
+    def test_in_app_config_keeps_every_action(self):
+        entry = self._entry()
+        assert len(entry["actions"]) == 6
+        assert entry["config"]["outside_caller"] is False
+
+
+@pytest.mark.unit
+class TestBuildConfigOutsideCallers:
+    def _cfg(self, monkeypatch, agent_config, allowed=False):
+        from docsgpt.api.answer.services.stream_processor import StreamProcessor
+
+        class _SrcRepo:
+            def __init__(self, conn):
+                pass
+
+            def get_any(self, sid, owner):
+                return {"id": sid, "config": {"kind": "wiki"}, "wiki_outside_edits": allowed}
+
+        monkeypatch.setattr("docsgpt.api.answer.services.stream_processor.SourcesRepository", _SrcRepo)
+        monkeypatch.setattr("docsgpt.api.answer.services.stream_processor.db_readonly", _noop_conn)
+        monkeypatch.setattr(
+            "docsgpt.api.answer.services.stream_processor._wiki_write_owner", lambda conn, sid, uid: "owner-x"
+        )
+        proc = StreamProcessor.__new__(StreamProcessor)
+        proc.all_sources = [{"id": "wiki-src"}]
+        proc.decoded_token = {"sub": "owner-x"}
+        if agent_config is not None:
+            proc.agent_config = agent_config
+        return proc._build_wiki_config()
+
+    @pytest.mark.parametrize("flag", ["external_api_caller", "public_link_caller"])
+    def test_outside_caller_gets_read_only_while_off(self, monkeypatch, flag):
+        cfg = self._cfg(monkeypatch, {flag: True})
+        assert cfg["outside_caller"] is True
+        assert cfg["writes_allowed"] is False
+
+    @pytest.mark.parametrize("flag", ["external_api_caller", "public_link_caller"])
+    def test_outside_caller_may_write_when_on(self, monkeypatch, flag):
+        cfg = self._cfg(monkeypatch, {flag: True}, allowed=True)
+        assert cfg["outside_caller"] is True
+        assert cfg["writes_allowed"] is True
+
+    def test_v1_key_holder_gets_read_only(self, monkeypatch):
+        from docsgpt.api.answer.services.stream_processor import StreamProcessor
+
+        monkeypatch.setattr(StreamProcessor, "external_caller", True, raising=False)
+        cfg = self._cfg(monkeypatch, {})
+        assert cfg["writes_allowed"] is False
+
+    @pytest.mark.parametrize("agent_config", [None, {}, {"external_api_caller": False}])
+    def test_owner_and_team_unaffected(self, monkeypatch, agent_config):
+        cfg = self._cfg(monkeypatch, agent_config)
+        assert cfg["outside_caller"] is False
+        assert cfg["writes_allowed"] is True
diff --git a/tests/api/answer/services/test_stream_processor_access.py b/tests/api/answer/services/test_stream_processor_access.py
index 1ac58ede..55932d9e 100644
--- a/tests/api/answer/services/test_stream_processor_access.py
+++ b/tests/api/answer/services/test_stream_processor_access.py
@@ -116,3 +116,33 @@ class TestWikiConfigAccess:
         assert cfg["source_owner_id"] == OWNER and cfg["user"] == "ed"
         assert self._cfg(use_conn, "vi", sid) is None
         assert self._cfg(use_conn, "eve", sid) is None
+
+
+class TestWikiOutsideEdits:
+    """API, widget and public-link runs edit a wiki only when its owner allows."""
+
+    def _tools(self, conn, caller, sid, agent_config):
+        from docsgpt.agents.tools.wiki import WIKI_TOOL_ID, add_wiki_tool
+        from docsgpt.api.answer.services.stream_processor import StreamProcessor
+
+        proc = StreamProcessor.__new__(StreamProcessor)
+        proc.all_sources = [{"id": sid}]
+        proc.decoded_token = {"sub": caller}
+        proc.agent_config = agent_config
+        cfg = proc._build_wiki_config()
+        tools = {}
+        add_wiki_tool(tools, cfg)
+        return {a["name"] for a in tools[WIKI_TOOL_ID]["actions"]}
+
+    @pytest.mark.parametrize("flag", ["external_api_caller", "public_link_caller"])
+    def test_outside_caller_reads_until_the_owner_allows_edits(self, use_conn, flag):
+        sid = str(SourcesRepository(use_conn).create("W", user_id=OWNER, config={"kind": "wiki"})["id"])
+        assert self._tools(use_conn, OWNER, sid, {flag: True}) == {"wiki_view"}
+        SourcesRepository(use_conn).set_wiki_outside_edits(sid, OWNER, True)
+        assert "wiki_create" in self._tools(use_conn, OWNER, sid, {flag: True})
+
+    def test_owner_and_team_editor_keep_every_action(self, use_conn):
+        sid = str(SourcesRepository(use_conn).create("W", user_id=OWNER, config={"kind": "wiki"})["id"])
+        _share(use_conn, "source", sid, "ed", "editor")
+        assert "wiki_create" in self._tools(use_conn, OWNER, sid, {})
+        assert "wiki_create" in self._tools(use_conn, "ed", sid, {})
diff --git a/tests/api/test_pat_rules.py b/tests/api/test_pat_rules.py
index a1bb0977..88e4205e 100644
--- a/tests/api/test_pat_rules.py
+++ b/tests/api/test_pat_rules.py
@@ -98,6 +98,8 @@ class TestClassification:
             ("/api/devices/pairings", "POST"),
             ("/api/connectors/auth", "GET"),
             ("/api/mcp_server/callback", "GET"),
+            ("/api/resource_settings", "PUT"),
+            ("/api/sources/<string:source_id>/wiki/settings", "PUT"),
         ],
     )
     def test_sensitive_routes_are_never_token_reachable(self, rule, method):
diff --git a/tests/api/user/sources/test_wiki_routes.py b/tests/api/user/sources/test_wiki_routes.py
index bf4df9aa..62ec960e 100644
--- a/tests/api/user/sources/test_wiki_routes.py
+++ b/tests/api/user/sources/test_wiki_routes.py
@@ -606,3 +606,102 @@ class TestWikiPageEdit:
 
         assert response.status_code == 403
         mock_reembed.assert_not_called()
+
+
+def _settings_call(app, pg_conn, sid, user, method="GET", body=None):
+    from docsgpt.api.user.sources.routes import WikiSettings
+
+    with _patch_db(pg_conn), app.test_request_context(
+        f"/api/sources/{sid}/wiki/settings", method=method, json=body
+    ):
+        from flask import request
+        request.decoded_token = {"sub": user} if user else None
+        resource = WikiSettings()
+        return resource.get(sid) if method == "GET" else resource.put(sid)
+
+
+class TestWikiSettings:
+    def _wiki(self, pg_conn, owner, kind="wiki"):
+        from docsgpt.storage.db.repositories.sources import SourcesRepository
+
+        src = SourcesRepository(pg_conn).create(
+            "wiki", user_id=owner, type=kind, config={"kind": kind}
+        )
+        return str(src["id"])
+
+    def _stored(self, pg_conn, sid):
+        from docsgpt.storage.db.repositories.sources import SourcesRepository
+
+        return SourcesRepository(pg_conn).get_by_id(sid)["wiki_outside_edits"]
+
+    def test_returns_401_unauthenticated(self, app, pg_conn):
+        assert _settings_call(app, pg_conn, str(uuid.uuid4()), None).status_code == 401
+        assert _settings_call(app, pg_conn, str(uuid.uuid4()), None, "PUT", {}).status_code == 401
+
+    def test_defaults_to_off(self, app, pg_conn):
+        sid = self._wiki(pg_conn, "alice-ws")
+        response = _settings_call(app, pg_conn, sid, "alice-ws")
+        assert response.status_code == 200
+        assert response.json["allow_outside_edits"] is False
+        assert "manage_settings" in response.json["allowed_actions"]
+
+    def test_owner_turns_it_on_and_off(self, app, pg_conn):
+        sid = self._wiki(pg_conn, "alice-ws-on")
+        response = _settings_call(
+            app, pg_conn, sid, "alice-ws-on", "PUT", {"allow_outside_edits": True}
+        )
+        assert response.status_code == 200
+        assert response.json["allow_outside_edits"] is True
+        assert self._stored(pg_conn, sid) is True
+        assert _settings_call(app, pg_conn, sid, "alice-ws-on").json["allow_outside_edits"] is True
+        _settings_call(app, pg_conn, sid, "alice-ws-on", "PUT", {"allow_outside_edits": False})
+        assert self._stored(pg_conn, sid) is False
+
+    def test_change_is_audited(self, app, pg_conn):
+        from sqlalchemy import text
+
+        sid = self._wiki(pg_conn, "alice-ws-audit")
+        _settings_call(app, pg_conn, sid, "alice-ws-audit", "PUT", {"allow_outside_edits": True})
+        row = pg_conn.execute(
+            text("SELECT metadata FROM auth_events WHERE event = 'source.wiki_settings_updated' AND actor_id = :a"),
+            {"a": "alice-ws-audit"},
+        ).fetchone()
+        assert row is not None
+        assert row[0]["source_id"] == sid and row[0]["allow_outside_edits"] is True
+
+    @pytest.mark.parametrize("level", ["editor", "viewer"])
+    def test_team_member_reads_but_cannot_change(self, app, pg_conn, level):
+        owner, member = f"alice-ws-{level}", f"bob-ws-{level}"
+        sid = self._wiki(pg_conn, owner)
+        _grant_team_access(pg_conn, owner, member, sid, level)
+        read = _settings_call(app, pg_conn, sid, member)
+        assert read.status_code == 200
+        assert read.json["allow_outside_edits"] is False
+        assert "manage_settings" not in read.json["allowed_actions"]
+        response = _settings_call(
+            app, pg_conn, sid, member, "PUT", {"allow_outside_edits": True}
+        )
+        assert response.status_code == 403
+        assert self._stored(pg_conn, sid) is False
+
+    def test_stranger_gets_404(self, app, pg_conn):
+        sid = self._wiki(pg_conn, "alice-ws-404")
+        assert _settings_call(app, pg_conn, sid, "eve-ws").status_code == 404
+        response = _settings_call(app, pg_conn, sid, "eve-ws", "PUT", {"allow_outside_edits": True})
+        assert response.status_code == 404
+        assert self._stored(pg_conn, sid) is False
+
+    @pytest.mark.parametrize("body", [{}, {"allow_outside_edits": "yes"}, {"allow_outside_edits": 1}])
+    def test_bad_body_is_400(self, app, pg_conn, body):
+        sid = self._wiki(pg_conn, "alice-ws-400")
+        response = _settings_call(app, pg_conn, sid, "alice-ws-400", "PUT", body)
+        assert response.status_code == 400
+        assert self._stored(pg_conn, sid) is False
+
+    def test_not_a_wiki_is_400(self, app, pg_conn):
+        sid = self._wiki(pg_conn, "alice-ws-classic", kind="classic")
+        response = _settings_call(
+            app, pg_conn, sid, "alice-ws-classic", "PUT", {"allow_outside_edits": True}
+        )
+        assert response.status_code == 400
+        assert self._stored(pg_conn, sid) is False
diff --git a/tests/storage/db/test_migration_0043.py b/tests/storage/db/test_migration_0043.py
new file mode 100644
index 00000000..942e47fe
--- /dev/null
+++ b/tests/storage/db/test_migration_0043.py
@@ -0,0 +1,52 @@
+"""Migration round-trip test for 0043_wiki_outside_edits."""
+
+from __future__ import annotations
+
+import os
+import subprocess
+import sys
+from pathlib import Path
+
+import pytest
+from sqlalchemy import text
+
+
+pytestmark = pytest.mark.integration
+
+_0042 = "0042_schedule_created_via_api"
+
+
+def _run_alembic(url: str, *args: str) -> None:
+    ini = Path(__file__).resolve().parents[3] / "docsgpt" / "alembic.ini"
+    subprocess.check_call(
+        [sys.executable, "-m", "alembic", "-c", str(ini), *args],
+        timeout=120,
+        env={**os.environ, "POSTGRES_URI": url},
+    )
+
+
+def _column_exists(conn) -> bool:
+    return conn.execute(
+        text(
+            "SELECT 1 FROM information_schema.columns WHERE table_schema = 'public' "
+            "AND table_name = 'sources' AND column_name = 'wiki_outside_edits'"
+        )
+    ).fetchone() is not None
+
+
+class TestMigration0043RoundTrip:
+    def test_head_defaults_to_off(self, pg_engine):
+        with pg_engine.begin() as conn:
+            value = conn.execute(
+                text("INSERT INTO sources (user_id, name) VALUES ('u', 'w') RETURNING wiki_outside_edits")
+            ).scalar()
+        assert value is False
+
+    def test_downgrade_drops_then_upgrade_restores(self, pg_engine):
+        url = pg_engine.url.render_as_string(hide_password=False)
+        _run_alembic(url, "downgrade", _0042)
+        with pg_engine.connect() as conn:
+            assert not _column_exists(conn)
+        _run_alembic(url, "upgrade", "head")
+        with pg_engine.connect() as conn:
+            assert _column_exists(conn)