diff --git a/apps/marketing/src/content/docs/guides/opencode.md b/apps/marketing/src/content/docs/guides/opencode.md
index b5adf297..755c7f51 100644
--- a/apps/marketing/src/content/docs/guides/opencode.md
+++ b/apps/marketing/src/content/docs/guides/opencode.md
@@ -22,10 +22,11 @@ The OpenCode plugin (`@plannotator/opencode`) hooks into OpenCode's plugin syste
 
 ## Workflow modes
 
-OpenCode support has three explicit modes:
+OpenCode support has four explicit modes:
 
 - **`plan-agent`** (default): `submit_plan` is available to OpenCode's built-in `plan` agent plus any extra agents listed in `planningAgents`.
 - **`manual`**: `submit_plan` is not registered. Use `/plannotator-last`, `/plannotator-annotate`, `/plannotator-review`, and `/plannotator-archive` when you want Plannotator.
+- **`user-managed`**: `submit_plan` is registered but no prompts or agent permissions are modified. You configure which agents can call `submit_plan` via OpenCode's agent configuration.
 - **`all-agents`**: legacy broad behavior. Primary agents can see and call `submit_plan`.
 
 Default config:
@@ -87,6 +88,19 @@ If you want commands only:
 }
 ```
 
+If you want the tool registered but want to manage prompts and permissions yourself:
+
+```json
+{
+  "$schema": "https://opencode.ai/config.json",
+  "plugin": [
+    ["@plannotator/opencode@latest", {
+      "workflow": "user-managed"
+    }]
+  ]
+}
+```
+
 ## Custom planning agents
 
 OpenCode's built-in `plan` agent is always included in `plan-agent` mode. If you use another planning agent, add its OpenCode agent name to `planningAgents`:
diff --git a/apps/opencode-plugin/README.md b/apps/opencode-plugin/README.md
index 8ef1347c..23dd048a 100644
--- a/apps/opencode-plugin/README.md
+++ b/apps/opencode-plugin/README.md
@@ -38,10 +38,11 @@ Restart OpenCode. By default, the `submit_plan` tool is available to OpenCode's
 
 ## Workflow Modes
 
-Plannotator supports three OpenCode workflows:
+Plannotator supports four OpenCode workflows:
 
 - **`plan-agent`** (default): `submit_plan` is available to OpenCode's built-in `plan` agent plus any extra agents listed in `planningAgents`. This keeps Plannotator integrated with OpenCode plan mode without nudging `build` to call it.
 - **`manual`**: `submit_plan` is not registered. Use `/plannotator-last`, `/plannotator-annotate`, `/plannotator-review`, and `/plannotator-archive` when you want Plannotator.
+- **`user-managed`**: `submit_plan` is registered but no prompts or agent permissions are modified. You manage which agents can call `submit_plan` via OpenCode's native agent configuration.
 - **`all-agents`**: legacy broad behavior. Primary agents can see and call `submit_plan`.
 
 Default config:
@@ -103,6 +104,19 @@ Use commands only:
 }
 ```
 
+Register the tool but manage prompts and permissions yourself:
+
+```json
+{
+  "$schema": "https://opencode.ai/config.json",
+  "plugin": [
+    ["@plannotator/opencode@latest", {
+      "workflow": "user-managed"
+    }]
+  ]
+}
+```
+
 ## How It Works
 
 1. The configured planning agent calls `submit_plan` → Plannotator opens in your browser
diff --git a/apps/opencode-plugin/index.ts b/apps/opencode-plugin/index.ts
index 112b4185..34c78a75 100644
--- a/apps/opencode-plugin/index.ts
+++ b/apps/opencode-plugin/index.ts
@@ -74,6 +74,7 @@ import {
   shouldApplyToolDefinitionRewrites,
   shouldInjectFullPlanningPrompt,
   shouldInjectGenericPlanReminder,
+  shouldModifyPrompts,
   shouldRegisterSubmitPlan,
   shouldRejectSubmitPlanForAgent,
   type PlannotatorOpenCodeOptions,
@@ -259,7 +260,7 @@ export const PlannotatorPlugin: Plugin = async (ctx, rawOptions?: PlannotatorOpe
     // that allows markdown file writing. OpenCode's original blocks ALL file edits,
     // but we need the agent to write plans, specs, docs, etc.
     "experimental.chat.messages.transform": async (input, output) => {
-      if (workflowOptions.workflow === "manual") return;
+      if (!shouldModifyPrompts(workflowOptions)) return;
 
       const lastUserAgent = getLastUserAgentFromMessages(output.messages);
       if (
@@ -313,7 +314,7 @@ tools (except writing markdown files), or otherwise make changes to the system.
 
     // Inject planning instructions into system prompt
     "experimental.chat.system.transform": async (input, output) => {
-      if (workflowOptions.workflow === "manual") return;
+      if (!shouldModifyPrompts(workflowOptions)) return;
 
       const systemText = output.system.join("\n");
       if (systemText.toLowerCase().includes("title generator") || systemText.toLowerCase().includes("generate a title")) {
diff --git a/apps/opencode-plugin/workflow.test.ts b/apps/opencode-plugin/workflow.test.ts
index 4280525e..b74c71de 100644
--- a/apps/opencode-plugin/workflow.test.ts
+++ b/apps/opencode-plugin/workflow.test.ts
@@ -5,6 +5,7 @@ import {
   shouldApplyToolDefinitionRewrites,
   shouldInjectFullPlanningPrompt,
   shouldInjectGenericPlanReminder,
+  shouldModifyPrompts,
   shouldRegisterSubmitPlan,
   shouldRejectSubmitPlanForAgent,
 } from "./workflow";
@@ -53,6 +54,16 @@ describe("workflow gates", () => {
     expect(shouldRejectSubmitPlanForAgent("build", options)).toBe(false);
   });
 
+  test("user-managed mode registers tool but skips prompt/config modifications", () => {
+    const options = normalizeWorkflowOptions({ workflow: "user-managed" });
+
+    expect(shouldRegisterSubmitPlan(options)).toBe(true);
+    expect(shouldModifyPrompts(options)).toBe(false);
+    expect(shouldApplyToolDefinitionRewrites(options)).toBe(false);
+    expect(shouldInjectFullPlanningPrompt("plan", options)).toBe(false);
+    expect(shouldRejectSubmitPlanForAgent("build", options)).toBe(false);
+  });
+
   test("plan-agent mode injects only for configured planning agents", () => {
     const options = normalizeWorkflowOptions({
       workflow: "plan-agent",
@@ -96,6 +107,14 @@ describe("applyWorkflowConfig", () => {
     expect(config).toEqual({});
   });
 
+  test("user-managed mode leaves OpenCode config untouched", () => {
+    const config: any = {};
+
+    applyWorkflowConfig(config, normalizeWorkflowOptions({ workflow: "user-managed" }), false);
+
+    expect(config).toEqual({});
+  });
+
   test("plan-agent mode exposes submit_plan to plan and denies build", () => {
     const config: any = {
       experimental: {
diff --git a/apps/opencode-plugin/workflow.ts b/apps/opencode-plugin/workflow.ts
index 0679c294..6a2e4647 100644
--- a/apps/opencode-plugin/workflow.ts
+++ b/apps/opencode-plugin/workflow.ts
@@ -1,6 +1,6 @@
 import { normalizeEditPermission } from "./plan-mode";
 
-export type WorkflowMode = "manual" | "plan-agent" | "all-agents";
+export type WorkflowMode = "manual" | "user-managed" | "plan-agent" | "all-agents";
 
 export interface PlannotatorOpenCodeOptions {
   workflow?: unknown;
@@ -13,7 +13,7 @@ export interface NormalizedWorkflowOptions {
   planningAgentSet: Set<string>;
 }
 
-const WORKFLOWS = new Set<WorkflowMode>(["manual", "plan-agent", "all-agents"]);
+const WORKFLOWS = new Set<WorkflowMode>(["manual", "user-managed", "plan-agent", "all-agents"]);
 const DEFAULT_WORKFLOW: WorkflowMode = "plan-agent";
 const DEFAULT_PLANNING_AGENTS = ["plan"];
 const BUILTIN_PLAN_AGENT = "plan";
@@ -80,15 +80,19 @@ export function shouldRegisterSubmitPlan(options: NormalizedWorkflowOptions): bo
   return options.workflow !== "manual";
 }
 
+export function shouldModifyPrompts(options: NormalizedWorkflowOptions): boolean {
+  return options.workflow !== "manual" && options.workflow !== "user-managed";
+}
+
 export function shouldApplyToolDefinitionRewrites(options: NormalizedWorkflowOptions): boolean {
-  return options.workflow !== "manual";
+  return options.workflow !== "manual" && options.workflow !== "user-managed";
 }
 
 export function shouldInjectFullPlanningPrompt(
   agentName: string | undefined,
   options: NormalizedWorkflowOptions,
 ): boolean {
-  return options.workflow !== "manual" && isPlanningAgent(agentName, options);
+  return shouldModifyPrompts(options) && isPlanningAgent(agentName, options);
 }
 
 export function shouldInjectGenericPlanReminder(
@@ -114,7 +118,7 @@ export function applyWorkflowConfig(
   options: NormalizedWorkflowOptions,
   allowSubagents: boolean,
 ): void {
-  if (options.workflow === "manual") return;
+  if (options.workflow === "manual" || options.workflow === "user-managed") return;
 
   if (!allowSubagents) {
     const existingPrimaryTools = opencodeConfig.experimental?.primary_tools ?? [];