diff --git a/package-lock.json b/package-lock.json
index 0bc291f33..329900bfb 100644
--- a/package-lock.json
+++ b/package-lock.json
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@@ -955,6 +956,18 @@
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@@ -2614,6 +2680,30 @@
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+      "resolved": "https://registry.npmjs.org/call-bound/-/call-bound-1.0.4.tgz",
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@@ -2766,6 +2894,28 @@
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+      "license": "MIT",
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+      "funding": {
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+        "url": "https://opencollective.com/express"
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+      "resolved": "https://registry.npmjs.org/content-type/-/content-type-1.0.5.tgz",
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+      "resolved": "https://registry.npmjs.org/cors/-/cors-2.8.6.tgz",
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+        "vary": "^1"
+      },
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+        "url": "https://opencollective.com/express"
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@@ -2828,6 +3012,15 @@
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@@ -2846,6 +3039,20 @@
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@@ -2855,6 +3062,12 @@
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@@ -2862,6 +3075,15 @@
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@@ -2881,6 +3133,12 @@
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+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/range-parser": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/range-parser/-/range-parser-1.2.1.tgz",
+      "integrity": "sha512-Hrgsx+orqoygnmhFbKaHE6c296J+HTAQXoxEF6gNupROmmGJRoyzfG3ccAveqCBrwr/2yxQ5BVd/GTl5agOwSg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/raw-body": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/raw-body/-/raw-body-3.0.2.tgz",
+      "integrity": "sha512-K5zQjDllxWkf7Z5xJdV0/B0WTNqx6vxG70zJE4N0kBs4LovmEYWJzQGxC9bS9RAKu3bgM40lrd5zoLJ12MQ5BA==",
+      "license": "MIT",
+      "dependencies": {
+        "bytes": "~3.1.2",
+        "http-errors": "~2.0.1",
+        "iconv-lite": "~0.7.0",
+        "unpipe": "~1.0.0"
+      },
+      "engines": {
+        "node": ">= 0.10"
+      }
+    },
     "node_modules/readdirp": {
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/readdirp/-/readdirp-5.0.0.tgz",
@@ -4032,6 +4733,22 @@
         "node": ">= 4"
       }
     },
+    "node_modules/router": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/router/-/router-2.2.0.tgz",
+      "integrity": "sha512-nLTrUKm2UyiL7rlhapu/Zl45FwNgkZGaCpZbIHajDYgwlJCOzLSk+cIPAnsEqV955GjILJnKbdQC1nVPz+gAYQ==",
+      "license": "MIT",
+      "dependencies": {
+        "debug": "^4.4.0",
+        "depd": "^2.0.0",
+        "is-promise": "^4.0.0",
+        "parseurl": "^1.3.3",
+        "path-to-regexp": "^8.0.0"
+      },
+      "engines": {
+        "node": ">= 18"
+      }
+    },
     "node_modules/safe-buffer": {
       "version": "5.2.1",
       "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
@@ -4052,6 +4769,12 @@
       ],
       "license": "MIT"
     },
+    "node_modules/safer-buffer": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
+      "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==",
+      "license": "MIT"
+    },
     "node_modules/semver": {
       "version": "7.7.4",
       "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.4.tgz",
@@ -4064,6 +4787,57 @@
         "node": ">=10"
       }
     },
+    "node_modules/send": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/send/-/send-1.2.1.tgz",
+      "integrity": "sha512-1gnZf7DFcoIcajTjTwjwuDjzuz4PPcY2StKPlsGAQ1+YH20IRVrBaXSWmdjowTJ6u8Rc01PoYOGHXfP1mYcZNQ==",
+      "license": "MIT",
+      "dependencies": {
+        "debug": "^4.4.3",
+        "encodeurl": "^2.0.0",
+        "escape-html": "^1.0.3",
+        "etag": "^1.8.1",
+        "fresh": "^2.0.0",
+        "http-errors": "^2.0.1",
+        "mime-types": "^3.0.2",
+        "ms": "^2.1.3",
+        "on-finished": "^2.4.1",
+        "range-parser": "^1.2.1",
+        "statuses": "^2.0.2"
+      },
+      "engines": {
+        "node": ">= 18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
+    "node_modules/serve-static": {
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/serve-static/-/serve-static-2.2.1.tgz",
+      "integrity": "sha512-xRXBn0pPqQTVQiC8wyQrKs2MOlX24zQ0POGaj0kultvoOCstBQM5yvOhAVSUwOMjQtTvsPWoNCHfPGwaaQJhTw==",
+      "license": "MIT",
+      "dependencies": {
+        "encodeurl": "^2.0.0",
+        "escape-html": "^1.0.3",
+        "parseurl": "^1.3.3",
+        "send": "^1.2.0"
+      },
+      "engines": {
+        "node": ">= 18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
+    "node_modules/setprototypeof": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.2.0.tgz",
+      "integrity": "sha512-E5LDX7Wrp85Kil5bhZv46j8jOeboKq5JMmYM3gVGdGH8xFpPWXUMsNrlODCrkoxMEeNi/XZIwuRvY4XNwYMJpw==",
+      "license": "ISC"
+    },
     "node_modules/sharp": {
       "version": "0.34.5",
       "resolved": "https://registry.npmjs.org/sharp/-/sharp-0.34.5.tgz",
@@ -4112,7 +4886,6 @@
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-2.0.0.tgz",
       "integrity": "sha512-kHxr2zZpYtdmrN1qDjrrX/Z1rR1kG8Dx+gkpK1G4eXmvXswmcE1hTWBWYUzlraYw1/yZp6YuDY77YtvbN0dmDA==",
-      "dev": true,
       "license": "MIT",
       "dependencies": {
         "shebang-regex": "^3.0.0"
@@ -4125,12 +4898,83 @@
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/shebang-regex/-/shebang-regex-3.0.0.tgz",
       "integrity": "sha512-7++dFhtcx3353uBaq8DDR4NuxBetBzC7ZQOhmTQInHEd6bSrXdiEyzCvG07Z44UYdLShWUyXt5M/yhz8ekcb1A==",
-      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">=8"
       }
     },
+    "node_modules/side-channel": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/side-channel/-/side-channel-1.1.0.tgz",
+      "integrity": "sha512-ZX99e6tRweoUXqR+VBrslhda51Nh5MTQwou5tnUDgbtyM0dBgmhEDtWGP/xbKn6hqfPRHujUNwz5fy/wbbhnpw==",
+      "license": "MIT",
+      "dependencies": {
+        "es-errors": "^1.3.0",
+        "object-inspect": "^1.13.3",
+        "side-channel-list": "^1.0.0",
+        "side-channel-map": "^1.0.1",
+        "side-channel-weakmap": "^1.0.2"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/side-channel-list": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/side-channel-list/-/side-channel-list-1.0.0.tgz",
+      "integrity": "sha512-FCLHtRD/gnpCiCHEiJLOwdmFP+wzCmDEkc9y7NsYxeF4u7Btsn1ZuwgwJGxImImHicJArLP4R0yX4c2KCrMrTA==",
+      "license": "MIT",
+      "dependencies": {
+        "es-errors": "^1.3.0",
+        "object-inspect": "^1.13.3"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/side-channel-map": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/side-channel-map/-/side-channel-map-1.0.1.tgz",
+      "integrity": "sha512-VCjCNfgMsby3tTdo02nbjtM/ewra6jPHmpThenkTYh8pG9ucZ/1P8So4u4FGBek/BjpOVsDCMoLA/iuBKIFXRA==",
+      "license": "MIT",
+      "dependencies": {
+        "call-bound": "^1.0.2",
+        "es-errors": "^1.3.0",
+        "get-intrinsic": "^1.2.5",
+        "object-inspect": "^1.13.3"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/side-channel-weakmap": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/side-channel-weakmap/-/side-channel-weakmap-1.0.2.tgz",
+      "integrity": "sha512-WPS/HvHQTYnHisLo9McqBHOJk2FkHO/tlpvldyrnem4aeQp4hai3gythswg6p01oSoTl58rcpiFAjF2br2Ak2A==",
+      "license": "MIT",
+      "dependencies": {
+        "call-bound": "^1.0.2",
+        "es-errors": "^1.3.0",
+        "get-intrinsic": "^1.2.5",
+        "object-inspect": "^1.13.3",
+        "side-channel-map": "^1.0.1"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/signal-exit": {
       "version": "3.0.7",
       "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.7.tgz",
@@ -4197,6 +5041,15 @@
       "integrity": "sha512-gcj8zBWU5cFsi9WUP+4bFNXAyF1iRpA3LLyS/DP5xlrNzGmPIizUeBggKa8DbDwdqaKwUcTEnChtd2grWo/x/A==",
       "license": "MIT"
     },
+    "node_modules/statuses": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/statuses/-/statuses-2.0.2.tgz",
+      "integrity": "sha512-DvEy55V3DB7uknRo+4iOGT5fP1slR8wQohVdknigZPMpMstaKJQWhwiYBACJE3Ul2pTnATihhBYnRhZQHGBiRw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
     "node_modules/std-env": {
       "version": "3.10.0",
       "resolved": "https://registry.npmjs.org/std-env/-/std-env-3.10.0.tgz",
@@ -4312,6 +5165,15 @@
         "node": "20 || >=22"
       }
     },
+    "node_modules/toidentifier": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.1.tgz",
+      "integrity": "sha512-o5sSPKEkg/DIQNmH43V0/uerLrpzVedkUh8tGNvaeXpfpuwjKenlSox/2O/BTlZUtEe+JG7s5YhEz608PlAHRA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.6"
+      }
+    },
     "node_modules/token-types": {
       "version": "6.1.2",
       "resolved": "https://registry.npmjs.org/token-types/-/token-types-6.1.2.tgz",
@@ -4342,6 +5204,20 @@
       "integrity": "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==",
       "license": "0BSD"
     },
+    "node_modules/type-is": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-2.0.1.tgz",
+      "integrity": "sha512-OZs6gsjF4vMp32qrCbiVSkrFmXtG/AZhY3t0iAMrMBiAZyV9oALtXO8hsrHbMXF9x6L3grlFuwW2oAz7cav+Gw==",
+      "license": "MIT",
+      "dependencies": {
+        "content-type": "^1.0.5",
+        "media-typer": "^1.1.0",
+        "mime-types": "^3.0.0"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
     "node_modules/typescript": {
       "version": "5.9.3",
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
@@ -4389,6 +5265,15 @@
       "integrity": "sha512-TmnEAEAsBJVZM/AADELsK76llnwcf9vMKuPz8JflO1frO8Lchitr0fNaN9d+Ap0BjKtqWqd/J17qeDnXh8CL2A==",
       "license": "ISC"
     },
+    "node_modules/unpipe": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
+      "integrity": "sha512-pjy2bYhSsufwWlKwPc+l3cN7+wuJlK6uz0YdJEOlQDbl6jo/YlPi4mb8agUkVC8BF7V8NuzeyPNqRksA3hztKQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
     "node_modules/v8-to-istanbul": {
       "version": "9.3.0",
       "resolved": "https://registry.npmjs.org/v8-to-istanbul/-/v8-to-istanbul-9.3.0.tgz",
@@ -4404,6 +5289,15 @@
         "node": ">=10.12.0"
       }
     },
+    "node_modules/vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
     "node_modules/web-streams-polyfill": {
       "version": "3.3.3",
       "resolved": "https://registry.npmjs.org/web-streams-polyfill/-/web-streams-polyfill-3.3.3.tgz",
@@ -4417,7 +5311,6 @@
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
       "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
-      "dev": true,
       "license": "ISC",
       "dependencies": {
         "isexe": "^2.0.0"
diff --git a/package.json b/package.json
index adf5b4560..c9012c8e1 100644
--- a/package.json
+++ b/package.json
@@ -72,6 +72,7 @@
     "@google/genai": "^1.40.0",
     "@mariozechner/jiti": "^2.6.2",
     "@mistralai/mistralai": "1.14.1",
+    "@modelcontextprotocol/sdk": "^1.27.1",
     "@octokit/rest": "^22.0.1",
     "@silvia-odwyer/photon-node": "^0.3.4",
     "@sinclair/typebox": "^0.34.41",
diff --git a/src/cli.ts b/src/cli.ts
index 339440ded..2cbbbb3b3 100644
--- a/src/cli.ts
+++ b/src/cli.ts
@@ -25,7 +25,7 @@ import { printHelp, printSubcommandHelp } from './help-text.js'
 // Minimal CLI arg parser — detects print/subagent mode flags
 // ---------------------------------------------------------------------------
 interface CliFlags {
-  mode?: 'text' | 'json' | 'rpc'
+  mode?: 'text' | 'json' | 'rpc' | 'mcp'
   print?: boolean
   continue?: boolean
   noSession?: boolean
@@ -59,7 +59,7 @@ function parseCliArgs(argv: string[]): CliFlags {
     const arg = args[i]
     if (arg === '--mode' && i + 1 < args.length) {
       const m = args[++i]
-      if (m === 'text' || m === 'json' || m === 'rpc') flags.mode = m
+      if (m === 'text' || m === 'json' || m === 'rpc' || m === 'mcp') flags.mode = m
     } else if (arg === '--print' || arg === '-p') {
       flags.print = true
     } else if (arg === '--continue' || arg === '-c') {
@@ -300,8 +300,18 @@ if (isPrintMode) {
     process.exit(0)
   }
 
+  if (mode === 'mcp') {
+    const { startMcpServer } = await import('./mcp-server.js')
+    await startMcpServer({
+      tools: session.agent.state.tools ?? [],
+      version: process.env.GSD_VERSION || '0.0.0',
+    })
+    // MCP server runs until the transport closes; keep alive
+    await new Promise(() => {})
+  }
+
   await runPrintMode(session, {
-    mode,
+    mode: mode as 'text' | 'json',
     messages: cliFlags.messages,
   })
   process.exit(0)
@@ -411,6 +421,7 @@ if (!process.stdin.isTTY) {
   process.stderr.write('[gsd] Non-interactive alternatives:\n')
   process.stderr.write('[gsd]   gsd --print "your message"     Single-shot prompt\n')
   process.stderr.write('[gsd]   gsd --mode rpc                 JSON-RPC over stdin/stdout\n')
+  process.stderr.write('[gsd]   gsd --mode mcp                 MCP server over stdin/stdout\n')
   process.stderr.write('[gsd]   gsd --mode text "message"      Text output mode\n')
   process.exit(1)
 }
diff --git a/src/help-text.ts b/src/help-text.ts
index eae02e8dc..561a7a6fe 100644
--- a/src/help-text.ts
+++ b/src/help-text.ts
@@ -24,7 +24,7 @@ export function printHelp(version: string): void {
   process.stdout.write(`GSD v${version} — Get Shit Done\n\n`)
   process.stdout.write('Usage: gsd [options] [message...]\n\n')
   process.stdout.write('Options:\n')
-  process.stdout.write('  --mode <text|json|rpc>   Output mode (default: interactive)\n')
+  process.stdout.write('  --mode <text|json|rpc|mcp> Output mode (default: interactive)\n')
   process.stdout.write('  --print, -p              Single-shot print mode\n')
   process.stdout.write('  --continue, -c           Resume the most recent session\n')
   process.stdout.write('  --model <id>             Override model (e.g. claude-opus-4-6)\n')
diff --git a/src/resources/extensions/gsd/diff-context.ts b/src/resources/extensions/gsd/diff-context.ts
index 73048e189..3260d1d06 100644
--- a/src/resources/extensions/gsd/diff-context.ts
+++ b/src/resources/extensions/gsd/diff-context.ts
@@ -29,7 +29,7 @@ export interface RecentFilesOptions {
 const EXEC_OPTS = {
   encoding: "utf-8" as const,
   timeout: 5000,
-  stdio: ["pipe", "pipe", "pipe"] as const,
+  stdio: ["pipe", "pipe", "pipe"] as ["pipe", "pipe", "pipe"],
 };
 
 function git(cmd: string, cwd: string): string {
diff --git a/src/resources/extensions/gsd/mcp-server.ts b/src/resources/extensions/gsd/mcp-server.ts
new file mode 100644
index 000000000..624ef2054
--- /dev/null
+++ b/src/resources/extensions/gsd/mcp-server.ts
@@ -0,0 +1,87 @@
+// @ts-ignore — @modelcontextprotocol/sdk types may not be in extensions tsconfig
+import { Server } from '@modelcontextprotocol/sdk/server'
+// @ts-ignore
+import { StdioServerTransport } from '@modelcontextprotocol/sdk/server/stdio'
+// @ts-ignore
+import { ListToolsRequestSchema, CallToolRequestSchema } from '@modelcontextprotocol/sdk/types'
+
+interface McpTool {
+  name: string
+  description: string
+  parameters: Record<string, unknown>
+  execute(toolCallId: string, params: Record<string, unknown>, signal?: AbortSignal, onUpdate?: unknown): Promise<{ content: Array<{ type: string; text?: string; data?: string; mimeType?: string }> }>
+}
+
+export async function startMcpServer(options: {
+  tools: McpTool[]
+  version?: string
+}): Promise<void> {
+  const { tools, version = '0.0.0' } = options
+
+  const toolMap = new Map<string, McpTool>()
+  for (const tool of tools) {
+    toolMap.set(tool.name, tool)
+  }
+
+  const server = new Server(
+    { name: 'gsd', version },
+    { capabilities: { tools: {} } },
+  )
+
+  server.setRequestHandler(ListToolsRequestSchema, async () => {
+    return {
+      tools: tools.map((t) => ({
+        name: t.name,
+        description: t.description,
+        inputSchema: t.parameters,
+      })),
+    }
+  })
+
+  server.setRequestHandler(CallToolRequestSchema, async (request: any) => {
+    const { name, arguments: args } = request.params
+    const tool = toolMap.get(name)
+    if (!tool) {
+      return {
+        isError: true,
+        content: [{ type: 'text' as const, text: `Unknown tool: ${name}` }],
+      }
+    }
+
+    try {
+      const result = await tool.execute(
+        `mcp-${Date.now()}`,
+        args ?? {},
+        undefined,
+        undefined,
+      )
+
+      const content = result.content.map((block) => {
+        if (block.type === 'text') {
+          return { type: 'text' as const, text: block.text }
+        }
+        if (block.type === 'image') {
+          return {
+            type: 'image' as const,
+            data: block.data,
+            mimeType: block.mimeType,
+          }
+        }
+        return { type: 'text' as const, text: JSON.stringify(block) }
+      })
+
+      return { content }
+    } catch (err: unknown) {
+      const message = err instanceof Error ? err.message : String(err)
+      return {
+        isError: true,
+        content: [{ type: 'text' as const, text: message }],
+      }
+    }
+  })
+
+  const transport = new StdioServerTransport()
+  await server.connect(transport)
+
+  process.stderr.write(`[gsd] MCP server started (v${version})\n`)
+}
diff --git a/src/resources/extensions/gsd/token-counter.ts b/src/resources/extensions/gsd/token-counter.ts
index 28b80519d..174ddaf9c 100644
--- a/src/resources/extensions/gsd/token-counter.ts
+++ b/src/resources/extensions/gsd/token-counter.ts
@@ -1,14 +1,17 @@
-import type { Tiktoken } from "tiktoken";
+interface TokenEncoder {
+	encode(text: string): Uint32Array | number[];
+}
 
-let encoder: Tiktoken | null = null;
+let encoder: TokenEncoder | null = null;
 let encoderFailed = false;
 
-async function getEncoder(): Promise<Tiktoken | null> {
+async function getEncoder(): Promise<TokenEncoder | null> {
 	if (encoder) return encoder;
 	if (encoderFailed) return null;
 	try {
-		const { encoding_for_model } = await import("tiktoken");
-		encoder = encoding_for_model("gpt-4o");
+		// @ts-ignore — tiktoken may not have type declarations in extensions tsconfig
+		const tiktoken = await import("tiktoken");
+		encoder = tiktoken.encoding_for_model("gpt-4o") as TokenEncoder;
 		return encoder;
 	} catch {
 		encoderFailed = true;
diff --git a/src/resources/skills/lint/SKILL.md b/src/resources/skills/lint/SKILL.md
new file mode 100644
index 000000000..b6f0d4637
--- /dev/null
+++ b/src/resources/skills/lint/SKILL.md
@@ -0,0 +1,141 @@
+---
+name: lint
+description: Lint and format code. Auto-detects ESLint, Biome, Prettier, or language-native formatters and runs them with auto-fix. Reports remaining issues with actionable suggestions.
+---
+
+<objective>
+Lint and format code in the current project. Auto-detect the project's linter and formatter toolchain, run them against the target files, and report results grouped by severity with actionable fix suggestions.
+</objective>
+
+<arguments>
+This skill accepts optional arguments after `/lint`:
+
+- **No arguments**: Lint only files changed in the current working tree (`git diff --name-only` and `git diff --cached --name-only`).
+- **A file or directory path**: Lint only that specific path (e.g., `/lint src/utils`).
+- **`--fix`**: Automatically apply safe fixes. Can be combined with a path (e.g., `/lint src/ --fix`).
+- **`--fix` without a path**: Auto-fix changed files only.
+
+Parse the arguments before proceeding. If `--fix` is present, set fix mode. If a non-flag argument is present, treat it as the target path.
+</arguments>
+
+<detection>
+Auto-detect the project's linter and formatter by checking configuration files in the project root. Check in this order and use the **first match found** for each category (linter vs. formatter). A project may have both a linter and a formatter.
+
+**JavaScript/TypeScript Linters:**
+
+1. **Biome** — Look for `biome.json` or `biome.jsonc` in the project root.
+   - Lint command: `npx @biomejs/biome check .` (or `--apply` with `--fix`)
+   - Format command: `npx @biomejs/biome format .` (or `--write` with `--fix`)
+   - Biome handles both linting and formatting. No need for a separate formatter if Biome is detected.
+
+2. **ESLint** — Look for `.eslintrc`, `.eslintrc.*` (js, cjs, json, yml, yaml), `eslint.config.*` (js, mjs, cjs, ts, mts, cts), or an `"eslintConfig"` key in `package.json`.
+   - Lint command: `npx eslint .` (or `--fix` with `--fix`)
+   - Check `package.json` for the installed version. ESLint 9+ uses flat config (`eslint.config.*`).
+
+**JavaScript/TypeScript Formatters (only if Biome was NOT detected):**
+
+3. **Prettier** — Look for `.prettierrc`, `.prettierrc.*`, `prettier.config.*`, or a `"prettier"` key in `package.json`.
+   - Format check: `npx prettier --check .`
+   - Format fix: `npx prettier --write .`
+
+**Rust:**
+
+4. **rustfmt** — Look for `rustfmt.toml` or `.rustfmt.toml`, or `Cargo.toml` in the project root.
+   - Format check: `cargo fmt -- --check`
+   - Format fix: `cargo fmt`
+   - Lint: `cargo clippy` (if available)
+
+**Go:**
+
+5. **Go tools** — Look for `go.mod` in the project root.
+   - Format check: `gofmt -l .`
+   - Format fix: `gofmt -w .`
+   - Lint: `golangci-lint run` (if installed), otherwise `go vet ./...`
+
+**Python:**
+
+6. **Ruff** — Look for `ruff.toml` or a `[tool.ruff]` section in `pyproject.toml`.
+   - Lint command: `ruff check .` (or `--fix` with `--fix`)
+   - Format command: `ruff format .` (or `--check` without `--fix`)
+
+7. **Black** — Look for a `[tool.black]` section in `pyproject.toml`, or `black` in requirements files.
+   - Format check: `black --check .`
+   - Format fix: `black .`
+
+If no linter or formatter is detected, inform the user and suggest common options for their project type based on the files present.
+</detection>
+
+<execution>
+
+**Step 1: Determine target files**
+
+- If a path argument was provided, use that path.
+- If no path argument, get changed files:
+  ```bash
+  git diff --name-only
+  git diff --cached --name-only
+  ```
+  Filter to files that still exist on disk. If no files are changed, inform the user and offer to lint the entire project instead.
+
+**Step 2: Run the detected tools**
+
+Run the linter and/or formatter against the target files or directory.
+
+- **Without `--fix`**: Run in check/report mode only. Do NOT modify any files.
+- **With `--fix`**: Run with auto-fix flags enabled.
+
+When running formatters without `--fix`, show a preview of what would change:
+- For Prettier: use `--check` and list files that would change.
+- For Biome: use `check` without `--apply`.
+- For Black: use `--check --diff` to show the diff preview.
+- For Ruff: use `--diff` for format and standard output for lint.
+- For rustfmt/gofmt: use `--check` or `-l` to list files, then show a diff for up to 5 files using `diff <(command) file`.
+
+**Step 3: Parse and organize output**
+
+Parse the tool output and organize issues:
+
+```markdown
+## Lint Results
+
+### Errors (X issues)
+| File | Line | Rule | Message |
+|------|------|------|---------|
+| ... | ... | ... | ... |
+
+### Warnings (X issues)
+| File | Line | Rule | Message |
+|------|------|------|---------|
+| ... | ... | ... | ... |
+
+### Formatting
+- X files would be reformatted
+- [list files]
+
+### Summary
+- Total issues: X errors, Y warnings, Z formatting
+- Auto-fixable: N issues (run `/lint --fix` to apply)
+```
+
+**Step 4: Suggest fixes for common issues**
+
+For the most frequent issues, provide brief actionable guidance:
+
+- If the same rule appears 5+ times, suggest a bulk fix or config change.
+- For unused imports/variables, list them for quick removal.
+- For formatting-only issues, note that `--fix` will resolve them safely.
+- For issues that cannot be auto-fixed, provide a one-line explanation of how to resolve each unique rule violation.
+
+</execution>
+
+<critical_rules>
+
+1. **Never modify files without `--fix`**: Default mode is report-only. Respect the user's working tree.
+2. **Use the project's own config**: Do not invent lint rules. Use whatever config files exist in the project.
+3. **Use the project's installed version**: Always prefer `npx`, `cargo`, or the project-local binary. Do not use globally installed tools unless no local version exists.
+4. **Handle missing tools gracefully**: If a config file exists but the tool is not installed, inform the user and provide the install command (e.g., `npm install --save-dev eslint`).
+5. **Respect `.gitignore` and ignore patterns**: Do not lint `node_modules`, `dist`, `build`, `target`, `.git`, or other commonly ignored directories. Most tools handle this automatically; verify they do.
+6. **Limit output**: If there are more than 50 issues, show the first 30 grouped by severity, then summarize the rest with counts per file. Do not flood the user with hundreds of lines.
+7. **Exit cleanly**: After presenting results, do not take further action. Let the user decide next steps.
+
+</critical_rules>
diff --git a/src/tests/integration/e2e-smoke.test.ts b/src/tests/integration/e2e-smoke.test.ts
new file mode 100644
index 000000000..e073e1277
--- /dev/null
+++ b/src/tests/integration/e2e-smoke.test.ts
@@ -0,0 +1,272 @@
+/**
+ * E2E smoke tests for the GSD CLI binary (dist/loader.js).
+ *
+ * These tests exercise the CLI entry point as a black box by spawning child
+ * processes and asserting on exit codes and output text.  They do NOT require
+ * API keys; tests that depend on a live LLM are scoped to gracefully handle
+ * the "No model selected" error path.
+ *
+ * Prerequisite: npm run build must be run first.
+ *
+ * Run with:
+ *   node --import ./src/resources/extensions/gsd/tests/resolve-ts.mjs \
+ *        --experimental-strip-types --test \
+ *        src/tests/integration/e2e-smoke.test.ts
+ */
+
+import test from "node:test";
+import assert from "node:assert/strict";
+import { spawn } from "node:child_process";
+import { existsSync } from "node:fs";
+import { join } from "node:path";
+
+const projectRoot = process.cwd();
+const loaderPath = join(projectRoot, "dist", "loader.js");
+
+if (!existsSync(loaderPath)) {
+  throw new Error("dist/loader.js not found — run: npm run build");
+}
+
+// ---------------------------------------------------------------------------
+// Helpers
+// ---------------------------------------------------------------------------
+
+type RunResult = {
+  stdout: string;
+  stderr: string;
+  code: number | null;
+  timedOut: boolean;
+};
+
+/**
+ * Spawn `node dist/loader.js ...args` and collect output.
+ *
+ * @param args    CLI arguments to pass after the script path
+ * @param timeoutMs  Maximum time to wait before SIGTERM (default 8 s)
+ * @param env     Additional / override environment variables
+ */
+function runGsd(
+  args: string[],
+  timeoutMs = 8_000,
+  env: NodeJS.ProcessEnv = {},
+): Promise<RunResult> {
+  return new Promise((resolve) => {
+    let stdout = "";
+    let stderr = "";
+    let timedOut = false;
+
+    const child = spawn("node", [loaderPath, ...args], {
+      cwd: projectRoot,
+      env: { ...process.env, ...env },
+      stdio: ["pipe", "pipe", "pipe"],
+    });
+
+    child.stdout.on("data", (chunk: Buffer) => { stdout += chunk.toString(); });
+    child.stderr.on("data", (chunk: Buffer) => { stderr += chunk.toString(); });
+
+    // Close stdin so the process sees a non-TTY environment.
+    child.stdin.end();
+
+    const timer = setTimeout(() => {
+      timedOut = true;
+      child.kill("SIGTERM");
+    }, timeoutMs);
+
+    child.on("close", (code) => {
+      clearTimeout(timer);
+      resolve({ stdout, stderr, code, timedOut });
+    });
+  });
+}
+
+/** Strip ANSI escape codes from a string. */
+function stripAnsi(s: string): string {
+  // eslint-disable-next-line no-control-regex
+  return s.replace(/\x1b\[[0-9;]*[A-Za-z]/g, "");
+}
+
+// ---------------------------------------------------------------------------
+// 1. gsd --version outputs a semver string and exits 0
+// ---------------------------------------------------------------------------
+
+test("gsd --version outputs a semver version string and exits 0", async () => {
+  const result = await runGsd(["--version"]);
+
+  assert.strictEqual(result.code, 0, `expected exit 0, got ${result.code}`);
+  assert.ok(!result.timedOut, "process should not time out");
+
+  const version = result.stdout.trim();
+  // Semver: MAJOR.MINOR.PATCH with optional pre-release / build metadata
+  assert.match(
+    version,
+    /^\d+\.\d+\.\d+/,
+    `expected semver output, got: ${JSON.stringify(version)}`,
+  );
+});
+
+// ---------------------------------------------------------------------------
+// 2. gsd --help outputs usage information and exits 0
+// ---------------------------------------------------------------------------
+
+test("gsd --help outputs usage information and exits 0", async () => {
+  const result = await runGsd(["--help"]);
+
+  assert.strictEqual(result.code, 0, `expected exit 0, got ${result.code}`);
+  assert.ok(!result.timedOut, "process should not time out");
+
+  const output = stripAnsi(result.stdout);
+
+  assert.ok(
+    output.includes("Usage:"),
+    `expected 'Usage:' in help output, got:\n${output.slice(0, 500)}`,
+  );
+  assert.ok(
+    output.includes("--version"),
+    "help output should mention --version flag",
+  );
+  assert.ok(
+    output.includes("--help"),
+    "help output should mention --help flag",
+  );
+  assert.ok(
+    output.includes("--print"),
+    "help output should mention --print flag",
+  );
+  assert.ok(
+    output.includes("--list-models"),
+    "help output should mention --list-models flag",
+  );
+});
+
+// ---------------------------------------------------------------------------
+// 3. gsd config --help outputs config-specific or general help and exits 0
+// ---------------------------------------------------------------------------
+
+test("gsd config --help outputs help and exits 0", async () => {
+  const result = await runGsd(["config", "--help"]);
+
+  assert.strictEqual(result.code, 0, `expected exit 0, got ${result.code}`);
+  assert.ok(!result.timedOut, "process should not time out");
+
+  // The loader fast-path intercepts --help only when it is the first argument.
+  // "config --help" passes through to cli.js where parseCliArgs() encounters
+  // --help and calls printHelp(), producing the full usage text.
+  const output = stripAnsi(result.stdout);
+  assert.ok(
+    output.includes("Usage:"),
+    `expected 'Usage:' in output, got:\n${output.slice(0, 500)}`,
+  );
+});
+
+// ---------------------------------------------------------------------------
+// 4. gsd update --help outputs update-specific or general help and exits 0
+// ---------------------------------------------------------------------------
+
+test("gsd update --help outputs help and exits 0", async () => {
+  const result = await runGsd(["update", "--help"]);
+
+  assert.strictEqual(result.code, 0, `expected exit 0, got ${result.code}`);
+  assert.ok(!result.timedOut, "process should not time out");
+
+  const output = stripAnsi(result.stdout);
+  assert.ok(
+    output.includes("Usage:"),
+    `expected 'Usage:' in output, got:\n${output.slice(0, 500)}`,
+  );
+});
+
+// ---------------------------------------------------------------------------
+// 5. gsd --list-models runs without crashing
+// ---------------------------------------------------------------------------
+
+test("gsd --list-models runs without crashing", async () => {
+  const result = await runGsd(["--list-models"]);
+
+  assert.ok(!result.timedOut, "gsd --list-models should exit within the timeout");
+  assert.strictEqual(result.code, 0, `expected exit 0, got ${result.code}`);
+
+  // No unhandled crash markers
+  const combinedOutput = stripAnsi(result.stdout + result.stderr);
+  assert.ok(
+    !combinedOutput.includes("Error: Cannot find module"),
+    "should not have missing module errors",
+  );
+  assert.ok(
+    !combinedOutput.includes("ERR_MODULE_NOT_FOUND"),
+    "should not have ERR_MODULE_NOT_FOUND",
+  );
+
+  // Either a table of models or the "no models" message
+  const hasTable = result.stdout.includes("provider") || result.stdout.includes("model");
+  const hasNoModelsMsg = result.stdout.includes("No models available");
+  assert.ok(
+    hasTable || hasNoModelsMsg,
+    `expected model list or 'No models available', got stdout:\n${result.stdout.slice(0, 300)}`,
+  );
+});
+
+// ---------------------------------------------------------------------------
+// 6. gsd --print in text mode does not segfault or throw unhandled errors
+//    (may fail with "No model selected" when no API keys are configured)
+// ---------------------------------------------------------------------------
+
+test("gsd --mode text --print does not segfault or throw unhandled errors", async () => {
+  // Use a temporary HOME with no .gsd/ config to simulate a keyless environment.
+  // The process is expected to either:
+  //   a) succeed (exit 0) if API keys are loaded from the real environment, or
+  //   b) exit 1 with "No model selected" if no API key is available.
+  // Either outcome is acceptable — what is NOT acceptable is an unhandled
+  // exception / crash / missing module error / non-zero exit from a signal.
+  const result = await runGsd(
+    ["--mode", "text", "--print", "echo hello"],
+    10_000,
+  );
+
+  assert.ok(!result.timedOut, "gsd --print should not hang indefinitely");
+
+  const combinedOutput = stripAnsi(result.stdout + result.stderr);
+
+  // Must not crash with module-not-found errors
+  assert.ok(
+    !combinedOutput.includes("ERR_MODULE_NOT_FOUND"),
+    "should not have ERR_MODULE_NOT_FOUND",
+  );
+  assert.ok(
+    !combinedOutput.includes("Error: Cannot find module"),
+    "should not have missing module errors",
+  );
+
+  // Must not terminate from a fatal signal (SIGSEGV, SIGABRT, etc.)
+  // Node exits with 128 + signal number on signal termination.
+  // SIGTERM is 15 (128+15=143), but we sent SIGTERM ourselves only on timeout,
+  // and we already asserted timedOut is false above.
+  assert.ok(
+    result.code !== null,
+    "process should exit cleanly, not be killed by a signal",
+  );
+
+  // Acceptable exit codes: 0 (success) or 1 (no model / API key error)
+  const acceptableCodes = new Set([0, 1]);
+  assert.ok(
+    acceptableCodes.has(result.code as number),
+    `expected exit code 0 or 1, got ${result.code}.\nstdout: ${result.stdout.slice(0, 300)}\nstderr: ${combinedOutput.slice(0, 300)}`,
+  );
+
+  // If exit code is 1, the error must be a clean "No model selected" message,
+  // not an unhandled thrown exception.
+  if (result.code === 1) {
+    const stderr = stripAnsi(result.stderr);
+    const isCleanModelError =
+      stderr.includes("No model selected") ||
+      stderr.includes("Use /login") ||
+      stderr.includes("no models available") ||
+      // Onboarding wizard exit path (no API key configured on first run)
+      stderr.includes("GSD") ||
+      result.stdout.includes("No model selected");
+
+    assert.ok(
+      isCleanModelError,
+      `expected a clean 'No model selected' error on exit 1, but got unexpected stderr:\n${stderr.slice(0, 500)}`,
+    );
+  }
+});