diff --git a/packages/opencode/src/cli/cmd/serve.ts b/packages/opencode/src/cli/cmd/serve.ts
index 3af3316a9d3..afcc69b32e7 100644
--- a/packages/opencode/src/cli/cmd/serve.ts
+++ b/packages/opencode/src/cli/cmd/serve.ts
@@ -1,5 +1,6 @@
 import { Server } from "../../server/server"
 import { cmd } from "./cmd"
+import { Wildcard } from "@/util/wildcard"
 
 export const ServeCommand = cmd({
   command: "serve",
@@ -15,14 +16,21 @@ export const ServeCommand = cmd({
         type: "string",
         describe: "hostname to listen on",
         default: "127.0.0.1",
+      })
+      .option("tools", {
+        type: "string",
+        describe:
+          "comma-separated tool patterns to enable/disable (e.g., '-*,read,write,webfetch' to only enable those three)",
       }),
   describe: "starts a headless opencode server",
   handler: async (args) => {
     const hostname = args.hostname
     const port = args.port
+    const tools = Wildcard.parseToolsPattern(args.tools)
     const server = Server.listen({
       port,
       hostname,
+      tools,
     })
     console.log(`opencode server listening on http://${server.hostname}:${server.port}`)
     await new Promise(() => {})
diff --git a/packages/opencode/src/cli/cmd/tui/component/prompt/index.tsx b/packages/opencode/src/cli/cmd/tui/component/prompt/index.tsx
index fce9917c2e7..9b0e234f732 100644
--- a/packages/opencode/src/cli/cmd/tui/component/prompt/index.tsx
+++ b/packages/opencode/src/cli/cmd/tui/component/prompt/index.tsx
@@ -25,6 +25,8 @@ import { createColors, createFrames } from "../../ui/spinner.ts"
 import { useDialog } from "@tui/ui/dialog"
 import { DialogProvider as DialogProviderConnect } from "../dialog-provider"
 import { useToast } from "../../ui/toast"
+import { useArgs } from "../../context/args"
+import { Wildcard } from "@/util/wildcard"
 
 export type PromptProps = {
   sessionID?: string
@@ -58,6 +60,7 @@ export function Prompt(props: PromptProps) {
   const sync = useSync()
   const dialog = useDialog()
   const toast = useToast()
+  const args = useArgs()
   const status = createMemo(() => sync.data.session_status[props.sessionID ?? ""] ?? { type: "idle" })
   const history = usePromptHistory()
   const command = useCommandDialog()
@@ -477,12 +480,14 @@ export function Prompt(props: PromptProps) {
         messageID,
       })
     } else {
+      const tools = Wildcard.parseToolsPattern(args.tools)
       sdk.client.session.prompt({
         sessionID,
         ...selectedModel,
         messageID,
         agent: local.agent.current().name,
         model: selectedModel,
+        ...(tools && { tools }),
         parts: [
           {
             id: Identifier.ascending("part"),
diff --git a/packages/opencode/src/cli/cmd/tui/context/args.tsx b/packages/opencode/src/cli/cmd/tui/context/args.tsx
index ffd43009a41..8cc2fecf2d5 100644
--- a/packages/opencode/src/cli/cmd/tui/context/args.tsx
+++ b/packages/opencode/src/cli/cmd/tui/context/args.tsx
@@ -6,6 +6,7 @@ export interface Args {
   prompt?: string
   continue?: boolean
   sessionID?: string
+  tools?: string
 }
 
 export const { use: useArgs, provider: ArgsProvider } = createSimpleContext({
diff --git a/packages/opencode/src/cli/cmd/tui/thread.ts b/packages/opencode/src/cli/cmd/tui/thread.ts
index 3cf8937a974..0e0a93da0b7 100644
--- a/packages/opencode/src/cli/cmd/tui/thread.ts
+++ b/packages/opencode/src/cli/cmd/tui/thread.ts
@@ -44,6 +44,11 @@ export const TuiThreadCommand = cmd({
         type: "string",
         describe: "agent to use",
       })
+      .option("tools", {
+        type: "string",
+        describe:
+          "comma-separated tool patterns to enable/disable (e.g., '-*,read,write,webfetch' to only enable those three)",
+      })
       .option("port", {
         type: "number",
         describe: "port to listen on",
@@ -105,6 +110,7 @@ export const TuiThreadCommand = cmd({
         agent: args.agent,
         model: args.model,
         prompt,
+        tools: args.tools,
       },
       onExit: async () => {
         await client.call("shutdown", undefined)
diff --git a/packages/opencode/src/cli/cmd/web.ts b/packages/opencode/src/cli/cmd/web.ts
index 3d3036b1b07..9324a45aaed 100644
--- a/packages/opencode/src/cli/cmd/web.ts
+++ b/packages/opencode/src/cli/cmd/web.ts
@@ -3,6 +3,7 @@ import { UI } from "../ui"
 import { cmd } from "./cmd"
 import open from "open"
 import { networkInterfaces } from "os"
+import { Wildcard } from "@/util/wildcard"
 
 function getNetworkIPs() {
   const nets = networkInterfaces()
@@ -40,14 +41,21 @@ export const WebCommand = cmd({
         type: "string",
         describe: "hostname to listen on",
         default: "127.0.0.1",
+      })
+      .option("tools", {
+        type: "string",
+        describe:
+          "comma-separated tool patterns to enable/disable (e.g., '-*,read,write,webfetch' to only enable those three)",
       }),
   describe: "starts a headless opencode server",
   handler: async (args) => {
     const hostname = args.hostname
     const port = args.port
+    const tools = Wildcard.parseToolsPattern(args.tools)
     const server = Server.listen({
       port,
       hostname,
+      tools,
     })
     UI.empty()
     UI.println(UI.logo("  "))
diff --git a/packages/opencode/src/server/server.ts b/packages/opencode/src/server/server.ts
index 6af1b490329..3e40ab89068 100644
--- a/packages/opencode/src/server/server.ts
+++ b/packages/opencode/src/server/server.ts
@@ -58,6 +58,8 @@ export namespace Server {
     Connected: BusEvent.define("server.connected", z.object({})),
   }
 
+  let defaultTools: Record<string, boolean> | undefined
+
   const app = new Hono()
   export const App = lazy(() =>
     app
@@ -1163,7 +1165,11 @@ export namespace Server {
           return stream(c, async (stream) => {
             const sessionID = c.req.valid("param").sessionID
             const body = c.req.valid("json")
-            const msg = await SessionPrompt.prompt({ ...body, sessionID })
+            const msg = await SessionPrompt.prompt({
+              ...body,
+              sessionID,
+              tools: { ...defaultTools, ...body.tools },
+            })
             stream.write(JSON.stringify(msg))
           })
         },
@@ -2454,7 +2460,10 @@ export namespace Server {
     return result
   }
 
-  export function listen(opts: { port: number; hostname: string }) {
+  export function listen(opts: { port: number; hostname: string; tools?: Record<string, boolean> }) {
+    if (opts.tools) {
+      defaultTools = opts.tools
+    }
     const server = Bun.serve({
       port: opts.port,
       hostname: opts.hostname,
diff --git a/packages/opencode/src/util/wildcard.ts b/packages/opencode/src/util/wildcard.ts
index 9b595a0a9ec..94b148f6b40 100644
--- a/packages/opencode/src/util/wildcard.ts
+++ b/packages/opencode/src/util/wildcard.ts
@@ -40,6 +40,20 @@ export namespace Wildcard {
     return result
   }
 
+  export function parseToolsPattern(pattern: string | undefined): Record<string, boolean> | undefined {
+    if (!pattern?.trim()) return undefined
+    const result: Record<string, boolean> = {}
+    const parts = pattern.split(",").map((x) => x.trim())
+    for (const part of parts) {
+      if (part.startsWith("-")) {
+        result[part.slice(1)] = false
+      } else {
+        result[part] = true
+      }
+    }
+    return result
+  }
+
   function matchSequence(items: string[], patterns: string[]): boolean {
     if (patterns.length === 0) return true
     const [pattern, ...rest] = patterns
diff --git a/packages/opencode/test/util/wildcard.test.ts b/packages/opencode/test/util/wildcard.test.ts
index f7f1e15457b..d97bc39aca0 100644
--- a/packages/opencode/test/util/wildcard.test.ts
+++ b/packages/opencode/test/util/wildcard.test.ts
@@ -53,3 +53,42 @@ test("allStructured handles sed flags", () => {
   expect(Wildcard.allStructured({ head: "sed", tail: ["-n", "1p", "file"] }, rules)).toBe("allow")
   expect(Wildcard.allStructured({ head: "sed", tail: ["-i", "-n", "/./p", "myfile.txt"] }, rules)).toBe("ask")
 })
+
+test("parseToolsPattern handles empty and undefined", () => {
+  expect(Wildcard.parseToolsPattern(undefined)).toBeUndefined()
+  expect(Wildcard.parseToolsPattern("")).toBeUndefined()
+  expect(Wildcard.parseToolsPattern("   ")).toBeUndefined()
+})
+
+test("parseToolsPattern disables all tools", () => {
+  expect(Wildcard.parseToolsPattern("-*")).toEqual({ "*": false })
+})
+
+test("parseToolsPattern enables all tools", () => {
+  expect(Wildcard.parseToolsPattern("*")).toEqual({ "*": true })
+})
+
+test("parseToolsPattern disables all and enables specific tools", () => {
+  expect(Wildcard.parseToolsPattern("-*,read,write,webfetch")).toEqual({
+    "*": false,
+    read: true,
+    write: true,
+    webfetch: true,
+  })
+})
+
+test("parseToolsPattern enables only specific tools", () => {
+  expect(Wildcard.parseToolsPattern("read,write,webfetch")).toEqual({
+    read: true,
+    write: true,
+    webfetch: true,
+  })
+})
+
+test("parseToolsPattern handles whitespace", () => {
+  expect(Wildcard.parseToolsPattern(" -* , read , write ")).toEqual({
+    "*": false,
+    read: true,
+    write: true,
+  })
+})