diff --git a/packages/opencode/src/cli/cmd/tui/routes/session/index.tsx b/packages/opencode/src/cli/cmd/tui/routes/session/index.tsx
index 06be5dfbefbf..84239885cc21 100644
--- a/packages/opencode/src/cli/cmd/tui/routes/session/index.tsx
+++ b/packages/opencode/src/cli/cmd/tui/routes/session/index.tsx
@@ -153,7 +153,7 @@ export function Session() {
   })
 
   const dimensions = useTerminalDimensions()
-  const [sidebar, setSidebar] = kv.signal<"auto" | "hide">("sidebar", "auto")
+  const [sidebar, setSidebar] = kv.signal<"auto" | "hide">("sidebar_visibility", "hide")
   const [sidebarOpen, setSidebarOpen] = createSignal(false)
   const [conceal, setConceal] = createSignal(true)
   const [showThinking, setShowThinking] = kv.signal("thinking_visibility", true)
diff --git a/packages/opencode/src/config/config.ts b/packages/opencode/src/config/config.ts
index 55684fc70dfb..54a2c2b532c1 100644
--- a/packages/opencode/src/config/config.ts
+++ b/packages/opencode/src/config/config.ts
@@ -196,6 +196,9 @@ const InfoSchema = Schema.Struct({
       url: Schema.optional(Schema.String).annotate({ description: "Enterprise URL" }),
     }),
   ),
+  yolo: Schema.optional(Schema.Boolean).annotate({
+    description: "Enable YOLO mode - auto-approve all permission prompts (except explicit deny rules)",
+  }),
   compaction: Schema.optional(
     Schema.Struct({
       auto: Schema.optional(Schema.Boolean).annotate({
diff --git a/packages/opencode/src/flag/flag.ts b/packages/opencode/src/flag/flag.ts
index 72c8931f5b71..1a23fbbe4b3c 100644
--- a/packages/opencode/src/flag/flag.ts
+++ b/packages/opencode/src/flag/flag.ts
@@ -89,6 +89,9 @@ export const Flag = {
   get OPENCODE_DISABLE_PROJECT_CONFIG() {
     return truthy("OPENCODE_DISABLE_PROJECT_CONFIG")
   },
+  get OPENCODE_YOLO() {
+    return truthy("OPENCODE_YOLO")
+  },
   get OPENCODE_TUI_CONFIG() {
     return process.env["OPENCODE_TUI_CONFIG"]
   },
diff --git a/packages/opencode/src/index.ts b/packages/opencode/src/index.ts
index 0a3a927b46ed..5c86b72e58d1 100644
--- a/packages/opencode/src/index.ts
+++ b/packages/opencode/src/index.ts
@@ -87,10 +87,17 @@ const cli = yargs(args)
     describe: "run without external plugins",
     type: "boolean",
   })
+  .option("yolo", {
+    describe: "auto-approve ask permission prompts",
+    type: "boolean",
+  })
   .middleware(async (opts) => {
     if (opts.pure) {
       process.env.OPENCODE_PURE = "1"
     }
+    if (opts.yolo) {
+      process.env.OPENCODE_YOLO = "1"
+    }
 
     await Log.init({
       print: process.argv.includes("--print-logs"),
diff --git a/packages/opencode/src/permission/index.ts b/packages/opencode/src/permission/index.ts
index b9a221155c9f..044333b7d7b8 100644
--- a/packages/opencode/src/permission/index.ts
+++ b/packages/opencode/src/permission/index.ts
@@ -10,6 +10,7 @@ import { zod } from "@/util/effect-zod"
 import { Log } from "@/util"
 import { withStatics } from "@/util/schema"
 import { Wildcard } from "@/util"
+import { Yolo } from "@/yolo"
 import { Deferred, Effect, Layer, Schema, Context } from "effect"
 import os from "os"
 import { evaluate as evalRule } from "./evaluate"
@@ -180,7 +181,9 @@ export const layer = Layer.effect(
     const ask = Effect.fn("Permission.ask")(function* (input: AskInput) {
       const { approved, pending } = yield* InstanceState.get(state)
       const { ruleset, ...request } = input
+      const yolo = Yolo.isEnabled()
       let needsAsk = false
+      let auto = false
 
       for (const pattern of request.patterns) {
         const rule = evaluate(request.permission, pattern, ruleset, approved)
@@ -191,9 +194,16 @@ export const layer = Layer.effect(
           })
         }
         if (rule.action === "allow") continue
+        if (yolo) {
+          auto = true
+          continue
+        }
         needsAsk = true
       }
 
+      if (auto) {
+        log.warn("auto-approved by yolo", { permission: request.permission, patterns: request.patterns })
+      }
       if (!needsAsk) return
 
       const id = request.id ?? PermissionID.ascending()
diff --git a/packages/opencode/src/project/bootstrap.ts b/packages/opencode/src/project/bootstrap.ts
index a7c071a9f80b..ea9b1c0fc5dc 100644
--- a/packages/opencode/src/project/bootstrap.ts
+++ b/packages/opencode/src/project/bootstrap.ts
@@ -13,11 +13,14 @@ import { FileWatcher } from "@/file/watcher"
 import { ShareNext } from "@/share"
 import * as Effect from "effect/Effect"
 import { Config } from "@/config"
+import { Yolo } from "../yolo"
 
 export const InstanceBootstrap = Effect.gen(function* () {
   Log.Default.info("bootstrapping", { directory: Instance.directory })
   // everything depends on config so eager load it for nice traces
   yield* Config.Service.use((svc) => svc.get())
+  // Yolo depends on config so init it right after config is ready.
+  yield* Effect.promise(() => Yolo.init())
   // Plugin can mutate config so it has to be initialized before anything else.
   yield* Plugin.Service.use((svc) => svc.init())
   yield* Effect.all(
diff --git a/packages/opencode/src/provider/provider.ts b/packages/opencode/src/provider/provider.ts
index d643f25373af..a088feaca6fb 100644
--- a/packages/opencode/src/provider/provider.ts
+++ b/packages/opencode/src/provider/provider.ts
@@ -1472,6 +1472,29 @@ const layer: Layer.Layer<
             }
           }
 
+          // Kimi's coding API requires a thinking block on every assistant message
+          // that contains tool_use when thinking is enabled. The @ai-sdk/anthropic SDK
+          // drops thinking blocks from multi-turn messages because Kimi doesn't return
+          // Anthropic-style signatures. We inject an empty thinking block here so Kimi
+          // doesn't reject the request with 'reasoning_content is missing'.
+          if (model.providerID === "kimi-for-coding" && opts.body && opts.method === "POST") {
+            const body = JSON.parse(opts.body as string)
+            if (Array.isArray(body.messages)) {
+              for (const msg of body.messages) {
+                if (msg.role !== "assistant" || !Array.isArray(msg.content)) continue
+                const hasToolUse = msg.content.some((b: any) => b.type === "tool_use")
+                const hasThinking = msg.content.some(
+                  (b: any) => b.type === "thinking" || b.type === "redacted_thinking",
+                )
+                if (hasToolUse && !hasThinking) {
+                  msg.content.unshift({ type: "thinking", thinking: ".", signature: "placeholder" })
+                  msg.reasoning_content = "."
+                }
+              }
+              opts.body = JSON.stringify(body)
+            }
+          }
+
           const res = await fetchFn(input, {
             ...opts,
             // @ts-ignore see here: https://github.com/oven-sh/bun/issues/16682
diff --git a/packages/opencode/src/server/routes/instance/config.ts b/packages/opencode/src/server/routes/instance/config.ts
index 7f368cd31c22..6337aa0f7f4c 100644
--- a/packages/opencode/src/server/routes/instance/config.ts
+++ b/packages/opencode/src/server/routes/instance/config.ts
@@ -1,12 +1,34 @@
 import { Hono } from "hono"
 import { describeRoute, validator, resolver } from "hono-openapi"
 import z from "zod"
+import path from "path"
 import { Config } from "@/config"
 import { Provider } from "@/provider"
+import { Yolo } from "@/yolo"
+import { Global } from "@/global"
 import { errors } from "../../error"
+import { Log } from "@/util"
 import { lazy } from "@/util/lazy"
 import { jsonRequest } from "./trace"
 
+const log = Log.create({ service: "server" })
+
+// Helper to read/write global config for YOLO persistence (uses config.json, not opencode.jsonc)
+async function readGlobalConfig(): Promise<Record<string, unknown>> {
+  const filepath = path.join(Global.Path.config, "config.json")
+  try {
+    const text = await Bun.file(filepath).text()
+    return JSON.parse(text)
+  } catch {
+    return {}
+  }
+}
+
+async function writeGlobalConfig(config: Record<string, unknown>): Promise<void> {
+  const filepath = path.join(Global.Path.config, "config.json")
+  await Bun.write(filepath, JSON.stringify(config, null, 2))
+}
+
 export const ConfigRoutes = lazy(() =>
   new Hono()
     .get(
@@ -85,5 +107,79 @@ export const ConfigRoutes = lazy(() =>
             default: Provider.defaultModelIDs(providers),
           }
         }),
+    )
+    .get(
+      "/yolo",
+      describeRoute({
+        summary: "Get YOLO mode status",
+        description:
+          "Check if YOLO mode is enabled. When enabled, all permission prompts are auto-approved (except explicit deny rules).",
+        operationId: "config.yolo.get",
+        responses: {
+          200: {
+            description: "YOLO mode status",
+            content: {
+              "application/json": {
+                schema: resolver(z.object({ enabled: z.boolean(), persisted: z.boolean() })),
+              },
+            },
+          },
+        },
+      }),
+      async (c) => {
+        const globalConfig = await readGlobalConfig()
+        return c.json({
+          enabled: Yolo.isEnabled(),
+          persisted: globalConfig.yolo === true,
+        })
+      },
+    )
+    .post(
+      "/yolo",
+      describeRoute({
+        summary: "Set YOLO mode",
+        description:
+          "Enable or disable YOLO mode. When enabled, all permission prompts are auto-approved (except explicit deny rules). Use with caution. Set persist=true to save to config file.",
+        operationId: "config.yolo.set",
+        responses: {
+          200: {
+            description: "YOLO mode updated",
+            content: {
+              "application/json": {
+                schema: resolver(z.object({ enabled: z.boolean(), persisted: z.boolean() })),
+              },
+            },
+          },
+        },
+      }),
+      validator("json", z.object({ enabled: z.boolean(), persist: z.boolean().optional() })),
+      async (c) => {
+        const { enabled, persist } = c.req.valid("json")
+        Yolo.set(enabled)
+
+        try {
+          const globalConfig = await readGlobalConfig()
+          const wasPersisted = globalConfig.yolo === true
+
+          if (persist) {
+            if (enabled) {
+              globalConfig.yolo = true
+            } else {
+              delete globalConfig.yolo
+            }
+            await writeGlobalConfig(globalConfig)
+            log.info("YOLO mode config updated", { enabled, path: Global.Path.config })
+          } else if (wasPersisted && enabled) {
+            delete globalConfig.yolo
+            await writeGlobalConfig(globalConfig)
+            log.info("YOLO mode downgraded to session-only", { path: Global.Path.config })
+          }
+        } catch (e) {
+          log.error("Failed to update YOLO config", { error: e })
+        }
+
+        const finalConfig = await readGlobalConfig()
+        return c.json({ enabled: Yolo.isEnabled(), persisted: finalConfig.yolo === true })
+      },
     ),
 )
diff --git a/packages/opencode/src/yolo/index.ts b/packages/opencode/src/yolo/index.ts
new file mode 100644
index 000000000000..612c6856ec73
--- /dev/null
+++ b/packages/opencode/src/yolo/index.ts
@@ -0,0 +1,67 @@
+import path from "path"
+import { Bus } from "@/bus"
+import { BusEvent } from "@/bus/bus-event"
+import { Flag } from "@/flag/flag"
+import { Global } from "@/global"
+import { Log } from "@/util"
+import z from "zod"
+
+export namespace Yolo {
+  const log = Log.create({ service: "yolo" })
+
+  let enabled = Flag.OPENCODE_YOLO
+
+  export const Event = {
+    Changed: BusEvent.define(
+      "yolo.changed",
+      z.object({
+        enabled: z.boolean(),
+      }),
+    ),
+  }
+
+  async function readGlobalYolo(): Promise<boolean> {
+    const filepath = path.join(Global.Path.config, "config.json")
+    try {
+      const text = await Bun.file(filepath).text()
+      const parsed = JSON.parse(text)
+      return parsed?.yolo === true
+    } catch {
+      return false
+    }
+  }
+
+  export async function init() {
+    if (await readGlobalYolo()) {
+      enabled = true
+      log.warn("YOLO mode enabled via config")
+    }
+    if (Flag.OPENCODE_YOLO) {
+      enabled = true
+      log.warn("YOLO mode enabled via OPENCODE_YOLO env var")
+    }
+    if (enabled) {
+      log.warn("YOLO mode is ACTIVE - all permission prompts will be auto-approved")
+    }
+  }
+
+  export function isEnabled(): boolean {
+    return enabled
+  }
+
+  export function set(value: boolean) {
+    const previous = enabled
+    enabled = value
+    if (previous !== value) {
+      log.warn(`YOLO mode ${value ? "ENABLED" : "DISABLED"}`)
+      void Bus.publish(Event.Changed, { enabled: value }).catch((err) => {
+        log.debug("failed to publish yolo.changed", { err: String(err) })
+      })
+    }
+  }
+
+  export function toggle(): boolean {
+    set(!enabled)
+    return enabled
+  }
+}
diff --git a/packages/opencode/test/permission/next.test.ts b/packages/opencode/test/permission/next.test.ts
index d654d4b876b8..8c3d78c94e61 100644
--- a/packages/opencode/test/permission/next.test.ts
+++ b/packages/opencode/test/permission/next.test.ts
@@ -9,6 +9,7 @@ import { Instance } from "../../src/project/instance"
 import { provideInstance, provideTmpdirInstance, tmpdirScoped } from "../fixture/fixture"
 import { testEffect } from "../lib/effect"
 import { MessageID, SessionID } from "../../src/session/schema"
+import { Yolo } from "../../src/yolo"
 
 const bus = Bus.layer
 const env = Layer.mergeAll(Permission.layer.pipe(Layer.provide(bus)), bus, CrossSpawnSpawner.defaultLayer)
@@ -1078,3 +1079,67 @@ it.live("ask - abort should clear pending request", () =>
     if (Exit.isFailure(exit)) expect(Cause.squash(exit.cause)).toBeInstanceOf(Permission.RejectedError)
   }),
 )
+
+it.live("ask - auto-approves ask when yolo is enabled", () =>
+  Effect.gen(function* () {
+    const dir = yield* tmpdirScoped({ git: true })
+    const run = withProvided(dir)
+
+    const previous = Yolo.isEnabled()
+    Yolo.set(true)
+    try {
+      const result = yield* ask({
+        sessionID: SessionID.make("session_test"),
+        permission: "bash",
+        patterns: ["ls"],
+        metadata: {},
+        always: [],
+        ruleset: [{ permission: "bash", pattern: "*", action: "ask" }],
+      }).pipe(run)
+      expect(result).toBeUndefined()
+      expect(yield* list().pipe(run)).toHaveLength(0)
+    } finally {
+      Yolo.set(previous)
+    }
+  }),
+)
+
+it.live("ask - yolo still respects deny rules", () =>
+  Effect.gen(function* () {
+    const dir = yield* tmpdirScoped({ git: true })
+    const run = withProvided(dir)
+
+    const previous = Yolo.isEnabled()
+    Yolo.set(true)
+    try {
+      const err = yield* fail(
+        ask({
+          sessionID: SessionID.make("session_test"),
+          permission: "bash",
+          patterns: ["rm -rf /"],
+          metadata: {},
+          always: [],
+          ruleset: [{ permission: "bash", pattern: "*", action: "deny" }],
+        }).pipe(run),
+      )
+      expect(err).toBeInstanceOf(Permission.DeniedError)
+    } finally {
+      Yolo.set(previous)
+    }
+  }),
+)
+
+test("yolo - init reads OPENCODE_YOLO at runtime", async () => {
+  const previous = Yolo.isEnabled()
+  const prevEnv = process.env.OPENCODE_YOLO
+  Yolo.set(false)
+  process.env.OPENCODE_YOLO = "1"
+  try {
+    await Yolo.init()
+    expect(Yolo.isEnabled()).toBe(true)
+  } finally {
+    Yolo.set(previous)
+    if (prevEnv === undefined) delete process.env.OPENCODE_YOLO
+    else process.env.OPENCODE_YOLO = prevEnv
+  }
+})