Add MCP tools for traffic-insight marker feature

Add 2 new MCP tools to expose the marker (traffic-insight) REST API:

- link_marker: per-link marker CRUD (create/update/delete)
  POST/PUT/DELETE /projects/{pid}/links/{lid}/markers
- marker_definition: project-level marker definition CRUD (create/update/delete/list)
  POST/PUT/DELETE/GET /projects/{pid}/marker-definitions
  Create auto-fans out global-{name} to every link

Read operations use existing link_get (returns markers dict).

gns3server/api/routes/mcp/__init__.py

@@ -101,6 +101,7 @@ from .links import (
     delete_link_handler, update_link_handler,
     reset_link_handler, start_capture_handler, stop_capture_handler,
     download_capture_file_handler,
+    link_marker_handler, marker_definition_handler,
 )
 from .templates import (
     list_templates_handler, get_template_handler, create_template_handler,
@@ -1001,6 +1002,76 @@ async def link_capture_download(
     return await asyncio.to_thread(_run_handler_sync, download_capture_file_handler, params)
 
 
+# ── Marker (traffic-insight) tools ─────────────────────────────────────
+
+
+@mcp.tool()
+async def link_marker(
+    project_id: Annotated[str, Field(description="UUID of the project")],
+    link_id: Annotated[str, Field(description="UUID of the link")],
+    action: Annotated[str, Field(description="Action: create, update, or delete")],
+    bpf: Annotated[str | None, Field(description="BPF expression, e.g. 'arp', 'icmp', 'tcp port 80' (required for create)")] = None,
+    marker_name: Annotated[str | None, Field(description="Marker name (required for update/delete actions)")] = None,
+    name: Annotated[str | None, Field(description="Custom marker name for create action (auto-generated if omitted)")] = None,
+    tag: Annotated[int | None, Field(description="Numeric tag for packet correlation")] = None,
+    enabled: Annotated[bool | None, Field(description="Enable or disable the marker (for update action)")] = None,
+    color: Annotated[str | None, Field(description="Hex color for UI highlight, e.g. '#ff5722'")] = None,
+    highlight_duration: Annotated[int | None, Field(description="UI highlight duration in milliseconds")] = None,
+) -> list[dict[str, Any]]:
+    """Manage traffic-insight markers on a link.
+
+    A marker highlights packets matching a BPF expression as they cross the link.
+    Set action='create' to add a marker, 'update' to modify it, 'delete' to remove.
+
+    Create requires: project_id, link_id, action='create', bpf
+    Update requires: project_id, link_id, action='update', marker_name, and at least one of (bpf, tag, enabled, color, highlight_duration)
+    Delete requires: project_id, link_id, action='delete', marker_name
+
+    To read current markers, use link_get — the response includes a 'markers' dict.
+
+    NOTE: Markers named 'global-*' are inherited from project-level marker definitions
+    and cannot be modified or deleted via this tool.
+    """
+    params = {"project_id": project_id, "link_id": link_id, "action": action}
+    for opt in ("bpf", "marker_name", "name", "tag", "enabled", "color", "highlight_duration"):
+        val = locals().get(opt)
+        if val is not None:
+            params[opt] = val
+    return await asyncio.to_thread(_run_handler_sync, link_marker_handler, params)
+
+
+@mcp.tool()
+async def marker_definition(
+    project_id: Annotated[str, Field(description="UUID of the project")],
+    action: Annotated[str, Field(description="Action: create, update, delete, or list")],
+    bpf: Annotated[str | None, Field(description="BPF expression, e.g. 'arp', 'ospf', 'tcp port 22' (required for create)")] = None,
+    def_name: Annotated[str | None, Field(description="Definition name (required for update/delete actions)")] = None,
+    name: Annotated[str | None, Field(description="Custom definition name for create action (auto-generated if omitted)")] = None,
+    tag: Annotated[int | None, Field(description="Numeric tag for packet correlation")] = None,
+    color: Annotated[str | None, Field(description="Hex color for UI highlight, e.g. '#ff5722'")] = None,
+    highlight_duration: Annotated[int | None, Field(description="UI highlight duration in milliseconds")] = None,
+) -> list[dict[str, Any]]:
+    """Manage project-level marker definitions — traffic-insight rules that apply to ALL links.
+
+    A marker definition is a global BPF rule. On create, it auto-fans out to every
+    link in the project as 'global-{name}'. Updates sync to all inherited copies.
+    On delete, 'global-{name}' is removed from every link.
+
+    Create requires: project_id, action='create', bpf
+    Update requires: project_id, action='update', def_name, and at least one of (bpf, tag, color, highlight_duration)
+    Delete requires: project_id, action='delete', def_name
+    List requires:  project_id, action='list'
+
+    Common BPF examples: 'arp', 'icmp', 'ospf', 'tcp port 22', 'udp port 53'
+    """
+    params = {"project_id": project_id, "action": action}
+    for opt in ("bpf", "def_name", "name", "tag", "color", "highlight_duration"):
+        val = locals().get(opt)
+        if val is not None:
+            params[opt] = val
+    return await asyncio.to_thread(_run_handler_sync, marker_definition_handler, params)
+
+
 # ── Snapshot tools ─────────────────────────────────────────────────────
 
 

gns3server/api/routes/mcp/links.py

@@ -367,6 +367,112 @@ def download_capture_file_handler(params: dict[str, Any], gns3_ctx: dict[str, An
     return result
 
 
+# ── Marker (traffic-insight) handlers ──────────────────────────────────
+
+
+def link_marker_handler(params: dict[str, Any], gns3_ctx: dict[str, Any]) -> dict[str, Any]:
+    """
+    Manage traffic-insight markers on a specific link.
+
+    Actions:
+      - create: POST /projects/{pid}/links/{lid}/markers
+      - update: PUT  /projects/{pid}/links/{lid}/markers/{name}
+      - delete: DELETE /projects/{pid}/links/{lid}/markers/{name}
+    """
+    project_id = params.get("project_id")
+    link_id = params.get("link_id")
+    action = params.get("action")
+    if not all([project_id, link_id, action]):
+        return {"error": "project_id, link_id and action are required"}
+    if action not in ("create", "update", "delete"):
+        return {"error": f"Unknown action: {action}. Supported: create, update, delete"}
+
+    conn = _get_connector(gns3_ctx)
+    base = f"{conn.base_url}/projects/{project_id}/links/{link_id}/markers"
+
+    if action == "create":
+        bpf = params.get("bpf")
+        if not bpf:
+            return {"error": "bpf is required for create action"}
+        body: dict[str, Any] = {"bpf": bpf}
+        for opt in ("name", "tag", "color", "highlight_duration"):
+            if params.get(opt) is not None:
+                body[opt] = params[opt]
+        return conn.http_call("post", base, json_data=body).json()
+
+    marker_name = params.get("marker_name")
+    if not marker_name:
+        return {"error": "marker_name is required for update/delete actions"}
+
+    url = f"{base}/{marker_name}"
+
+    if action == "update":
+        body = {}
+        for opt in ("bpf", "tag", "enabled", "color", "highlight_duration"):
+            if params.get(opt) is not None:
+                body[opt] = params[opt]
+        if not body:
+            return {"error": "At least one update field is required (bpf, tag, enabled, color, highlight_duration)"}
+        return conn.http_call("put", url, json_data=body).json()
+
+    # action == "delete"
+    conn.http_call("delete", url)
+    return {"message": f"Marker '{marker_name}' deleted from link {link_id}", "link_id": link_id, "marker_name": marker_name}
+
+
+def marker_definition_handler(params: dict[str, Any], gns3_ctx: dict[str, Any]) -> dict[str, Any]:
+    """
+    Manage project-level marker definitions (auto-fanout to all links).
+
+    Actions:
+      - create: POST   /projects/{pid}/marker-definitions  → fans out global-{name} to every link
+      - update: PUT    /projects/{pid}/marker-definitions/{name}
+      - delete: DELETE /projects/{pid}/marker-definitions/{name}
+      - list:   GET    /projects/{pid}/marker-definitions
+    """
+    project_id = params.get("project_id")
+    action = params.get("action")
+    if not all([project_id, action]):
+        return {"error": "project_id and action are required"}
+    if action not in ("create", "update", "delete", "list"):
+        return {"error": f"Unknown action: {action}. Supported: create, update, delete, list"}
+
+    conn = _get_connector(gns3_ctx)
+    base = f"{conn.base_url}/projects/{project_id}/marker-definitions"
+
+    if action == "list":
+        return conn.http_call("get", base).json()
+
+    if action == "create":
+        bpf = params.get("bpf")
+        if not bpf:
+            return {"error": "bpf is required for create action"}
+        body: dict[str, Any] = {"bpf": bpf}
+        for opt in ("name", "tag", "color", "highlight_duration"):
+            if params.get(opt) is not None:
+                body[opt] = params[opt]
+        return conn.http_call("post", base, json_data=body).json()
+
+    def_name = params.get("def_name")
+    if not def_name:
+        return {"error": "def_name is required for update/delete actions"}
+
+    url = f"{base}/{def_name}"
+
+    if action == "update":
+        body = {}
+        for opt in ("bpf", "tag", "color", "highlight_duration"):
+            if params.get(opt) is not None:
+                body[opt] = params[opt]
+        if not body:
+            return {"error": "At least one update field is required (bpf, tag, color, highlight_duration)"}
+        return conn.http_call("put", url, json_data=body).json()
+
+    # action == "delete"
+    conn.http_call("delete", url)
+    return {"message": f"Marker definition '{def_name}' deleted", "project_id": project_id, "def_name": def_name}
+
+
 # ── Tool definitions ───────────────────────────────────────────────────────
 
 LINK_TOOLS = [