diff --git a/bun.lock b/bun.lock
index 99d35168f30..538712601d5 100644
--- a/bun.lock
+++ b/bun.lock
@@ -18,14 +18,12 @@
         "prettier": "3.6.2",
         "semver": "^7.6.0",
         "sst": "3.17.23",
-        "stackback": "0.0.2",
         "turbo": "2.5.6",
-        "why-is-node-running": "2.2.2",
       },
     },
     "packages/app": {
       "name": "@opencode-ai/app",
-      "version": "1.1.43",
+      "version": "1.1.45",
       "dependencies": {
         "@kobalte/core": "catalog:",
         "@opencode-ai/sdk": "workspace:*",
@@ -75,7 +73,7 @@
     },
     "packages/console/app": {
       "name": "@opencode-ai/console-app",
-      "version": "1.1.43",
+      "version": "1.1.45",
       "dependencies": {
         "@cloudflare/vite-plugin": "1.15.2",
         "@ibm/plex": "6.4.1",
@@ -109,7 +107,7 @@
     },
     "packages/console/core": {
       "name": "@opencode-ai/console-core",
-      "version": "1.1.43",
+      "version": "1.1.45",
       "dependencies": {
         "@aws-sdk/client-sts": "3.782.0",
         "@jsx-email/render": "1.1.1",
@@ -136,7 +134,7 @@
     },
     "packages/console/function": {
       "name": "@opencode-ai/console-function",
-      "version": "1.1.43",
+      "version": "1.1.45",
       "dependencies": {
         "@ai-sdk/anthropic": "2.0.0",
         "@ai-sdk/openai": "2.0.2",
@@ -160,7 +158,7 @@
     },
     "packages/console/mail": {
       "name": "@opencode-ai/console-mail",
-      "version": "1.1.43",
+      "version": "1.1.45",
       "dependencies": {
         "@jsx-email/all": "2.2.3",
         "@jsx-email/cli": "1.4.3",
@@ -184,7 +182,7 @@
     },
     "packages/desktop": {
       "name": "@opencode-ai/desktop",
-      "version": "1.1.43",
+      "version": "1.1.45",
       "dependencies": {
         "@opencode-ai/app": "workspace:*",
         "@opencode-ai/ui": "workspace:*",
@@ -215,7 +213,7 @@
     },
     "packages/enterprise": {
       "name": "@opencode-ai/enterprise",
-      "version": "1.1.43",
+      "version": "1.1.45",
       "dependencies": {
         "@opencode-ai/ui": "workspace:*",
         "@opencode-ai/util": "workspace:*",
@@ -244,7 +242,7 @@
     },
     "packages/function": {
       "name": "@opencode-ai/function",
-      "version": "1.1.43",
+      "version": "1.1.45",
       "dependencies": {
         "@octokit/auth-app": "8.0.1",
         "@octokit/rest": "catalog:",
@@ -260,7 +258,7 @@
     },
     "packages/opencode": {
       "name": "opencode",
-      "version": "1.1.43",
+      "version": "1.1.45",
       "bin": {
         "opencode": "./bin/opencode",
       },
@@ -364,7 +362,7 @@
     },
     "packages/plugin": {
       "name": "@opencode-ai/plugin",
-      "version": "1.1.43",
+      "version": "1.1.45",
       "dependencies": {
         "@opencode-ai/sdk": "workspace:*",
         "zod": "catalog:",
@@ -384,7 +382,7 @@
     },
     "packages/sdk/js": {
       "name": "@opencode-ai/sdk",
-      "version": "1.1.43",
+      "version": "1.1.45",
       "devDependencies": {
         "@hey-api/openapi-ts": "0.90.10",
         "@tsconfig/node22": "catalog:",
@@ -395,7 +393,7 @@
     },
     "packages/slack": {
       "name": "@opencode-ai/slack",
-      "version": "1.1.43",
+      "version": "1.1.45",
       "dependencies": {
         "@opencode-ai/sdk": "workspace:*",
         "@slack/bolt": "^3.17.1",
@@ -408,7 +406,7 @@
     },
     "packages/ui": {
       "name": "@opencode-ai/ui",
-      "version": "1.1.43",
+      "version": "1.1.45",
       "dependencies": {
         "@kobalte/core": "catalog:",
         "@opencode-ai/sdk": "workspace:*",
@@ -450,7 +448,7 @@
     },
     "packages/util": {
       "name": "@opencode-ai/util",
-      "version": "1.1.43",
+      "version": "1.1.45",
       "dependencies": {
         "zod": "catalog:",
       },
@@ -461,7 +459,7 @@
     },
     "packages/web": {
       "name": "@opencode-ai/web",
-      "version": "1.1.43",
+      "version": "1.1.45",
       "dependencies": {
         "@astrojs/cloudflare": "12.6.3",
         "@astrojs/markdown-remark": "6.3.1",
@@ -3901,7 +3899,7 @@
 
     "which-typed-array": ["which-typed-array@1.1.20", "", { "dependencies": { "available-typed-arrays": "^1.0.7", "call-bind": "^1.0.8", "call-bound": "^1.0.4", "for-each": "^0.3.5", "get-proto": "^1.0.1", "gopd": "^1.2.0", "has-tostringtag": "^1.0.2" } }, "sha512-LYfpUkmqwl0h9A2HL09Mms427Q1RZWuOHsukfVcKRq9q95iQxdw0ix1JQrqbcDR9PH1QDwf5Qo8OZb5lksZ8Xg=="],
 
-    "why-is-node-running": ["why-is-node-running@2.2.2", "", { "dependencies": { "siginfo": "^2.0.0", "stackback": "0.0.2" }, "bin": { "why-is-node-running": "cli.js" } }, "sha512-6tSwToZxTOcotxHeA+qGCq1mVzKR3CwcJGmVcY+QE8SHy6TnpFnh8PAvPNHYr7EcuVeG0QSMxtYCuO1ta/G/oA=="],
+    "why-is-node-running": ["why-is-node-running@3.2.2", "", { "bin": { "why-is-node-running": "cli.js" } }, "sha512-NKUzAelcoCXhXL4dJzKIwXeR8iEVqsA0Lq6Vnd0UXvgaKbzVo4ZTHROF2Jidrv+SgxOQ03fMinnNhzZATxOD3A=="],
 
     "widest-line": ["widest-line@5.0.0", "", { "dependencies": { "string-width": "^7.0.0" } }, "sha512-c9bZp7b5YtRj2wOe6dlj32MK+Bx/M/d+9VB2SHM1OtsUHR0aV0tdP6DWh/iMt0kWi1t5g1Iudu6hQRNd1A4PVA=="],
 
@@ -4389,8 +4387,6 @@
 
     "opencode/@ai-sdk/openai-compatible": ["@ai-sdk/openai-compatible@1.0.30", "", { "dependencies": { "@ai-sdk/provider": "2.0.1", "@ai-sdk/provider-utils": "3.0.20" }, "peerDependencies": { "zod": "^3.25.76 || ^4.1.8" } }, "sha512-thubwhRtv9uicAxSWwNpinM7hiL/0CkhL/ymPaHuKvI494J7HIzn8KQZQ2ymRz284WTIZnI7VMyyejxW4RMM6w=="],
 
-    "opencode/why-is-node-running": ["why-is-node-running@3.2.2", "", { "bin": { "why-is-node-running": "cli.js" } }, "sha512-NKUzAelcoCXhXL4dJzKIwXeR8iEVqsA0Lq6Vnd0UXvgaKbzVo4ZTHROF2Jidrv+SgxOQ03fMinnNhzZATxOD3A=="],
-
     "opencontrol/@modelcontextprotocol/sdk": ["@modelcontextprotocol/sdk@1.6.1", "", { "dependencies": { "content-type": "^1.0.5", "cors": "^2.8.5", "eventsource": "^3.0.2", "express": "^5.0.1", "express-rate-limit": "^7.5.0", "pkce-challenge": "^4.1.0", "raw-body": "^3.0.0", "zod": "^3.23.8", "zod-to-json-schema": "^3.24.1" } }, "sha512-oxzMzYCkZHMntzuyerehK3fV6A2Kwh5BD6CGEJSVDU2QNEhfLOptf2X7esQgaHZXHZY0oHmMsOtIDLP71UJXgA=="],
 
     "opencontrol/@tsconfig/bun": ["@tsconfig/bun@1.0.7", "", {}, "sha512-udGrGJBNQdXGVulehc1aWT73wkR9wdaGBtB6yL70RJsqwW/yJhIg6ZbRlPOfIUiFNrnBuYLBi9CSmMKfDC7dvA=="],
diff --git a/packages/app/package.json b/packages/app/package.json
index 87ca7931c55..8459172e7cf 100644
--- a/packages/app/package.json
+++ b/packages/app/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@opencode-ai/app",
-  "version": "1.1.43",
+  "version": "1.1.45",
   "description": "",
   "type": "module",
   "exports": {
diff --git a/packages/console/app/package.json b/packages/console/app/package.json
index b10593a8fa5..84d45d3a7b1 100644
--- a/packages/console/app/package.json
+++ b/packages/console/app/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@opencode-ai/console-app",
-  "version": "1.1.43",
+  "version": "1.1.45",
   "type": "module",
   "license": "MIT",
   "scripts": {
diff --git a/packages/console/core/package.json b/packages/console/core/package.json
index 111390efbe7..38811d4de29 100644
--- a/packages/console/core/package.json
+++ b/packages/console/core/package.json
@@ -1,7 +1,7 @@
 {
   "$schema": "https://json.schemastore.org/package.json",
   "name": "@opencode-ai/console-core",
-  "version": "1.1.43",
+  "version": "1.1.45",
   "private": true,
   "type": "module",
   "license": "MIT",
diff --git a/packages/console/function/package.json b/packages/console/function/package.json
index c26b4584ded..50acf1567c6 100644
--- a/packages/console/function/package.json
+++ b/packages/console/function/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@opencode-ai/console-function",
-  "version": "1.1.43",
+  "version": "1.1.45",
   "$schema": "https://json.schemastore.org/package.json",
   "private": true,
   "type": "module",
diff --git a/packages/console/mail/package.json b/packages/console/mail/package.json
index 564a7140cc1..902dd447bed 100644
--- a/packages/console/mail/package.json
+++ b/packages/console/mail/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@opencode-ai/console-mail",
-  "version": "1.1.43",
+  "version": "1.1.45",
   "dependencies": {
     "@jsx-email/all": "2.2.3",
     "@jsx-email/cli": "1.4.3",
diff --git a/packages/desktop/package.json b/packages/desktop/package.json
index c1f330ce930..1b01f8a6f2b 100644
--- a/packages/desktop/package.json
+++ b/packages/desktop/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@opencode-ai/desktop",
   "private": true,
-  "version": "1.1.43",
+  "version": "1.1.45",
   "type": "module",
   "license": "MIT",
   "scripts": {
diff --git a/packages/enterprise/package.json b/packages/enterprise/package.json
index 03016c1c58f..2091e685749 100644
--- a/packages/enterprise/package.json
+++ b/packages/enterprise/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@opencode-ai/enterprise",
-  "version": "1.1.43",
+  "version": "1.1.45",
   "private": true,
   "type": "module",
   "license": "MIT",
diff --git a/packages/extensions/zed/extension.toml b/packages/extensions/zed/extension.toml
index eaa882b65bd..283036bf5b1 100644
--- a/packages/extensions/zed/extension.toml
+++ b/packages/extensions/zed/extension.toml
@@ -1,7 +1,7 @@
 id = "opencode"
 name = "OpenCode"
 description = "The open source coding agent."
-version = "1.1.43"
+version = "1.1.45"
 schema_version = 1
 authors = ["Anomaly"]
 repository = "https://github.com/anomalyco/opencode"
@@ -11,26 +11,26 @@ name = "OpenCode"
 icon = "./icons/opencode.svg"
 
 [agent_servers.opencode.targets.darwin-aarch64]
-archive = "https://github.com/anomalyco/opencode/releases/download/v1.1.43/opencode-darwin-arm64.zip"
+archive = "https://github.com/anomalyco/opencode/releases/download/v1.1.45/opencode-darwin-arm64.zip"
 cmd = "./opencode"
 args = ["acp"]
 
 [agent_servers.opencode.targets.darwin-x86_64]
-archive = "https://github.com/anomalyco/opencode/releases/download/v1.1.43/opencode-darwin-x64.zip"
+archive = "https://github.com/anomalyco/opencode/releases/download/v1.1.45/opencode-darwin-x64.zip"
 cmd = "./opencode"
 args = ["acp"]
 
 [agent_servers.opencode.targets.linux-aarch64]
-archive = "https://github.com/anomalyco/opencode/releases/download/v1.1.43/opencode-linux-arm64.tar.gz"
+archive = "https://github.com/anomalyco/opencode/releases/download/v1.1.45/opencode-linux-arm64.tar.gz"
 cmd = "./opencode"
 args = ["acp"]
 
 [agent_servers.opencode.targets.linux-x86_64]
-archive = "https://github.com/anomalyco/opencode/releases/download/v1.1.43/opencode-linux-x64.tar.gz"
+archive = "https://github.com/anomalyco/opencode/releases/download/v1.1.45/opencode-linux-x64.tar.gz"
 cmd = "./opencode"
 args = ["acp"]
 
 [agent_servers.opencode.targets.windows-x86_64]
-archive = "https://github.com/anomalyco/opencode/releases/download/v1.1.43/opencode-windows-x64.zip"
+archive = "https://github.com/anomalyco/opencode/releases/download/v1.1.45/opencode-windows-x64.zip"
 cmd = "./opencode.exe"
 args = ["acp"]
diff --git a/packages/function/package.json b/packages/function/package.json
index 4a9e82def5e..9746d11dccf 100644
--- a/packages/function/package.json
+++ b/packages/function/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@opencode-ai/function",
-  "version": "1.1.43",
+  "version": "1.1.45",
   "$schema": "https://json.schemastore.org/package.json",
   "private": true,
   "type": "module",
diff --git a/packages/opencode/package.json b/packages/opencode/package.json
index bd77afa2e8c..ab28687d358 100644
--- a/packages/opencode/package.json
+++ b/packages/opencode/package.json
@@ -1,6 +1,6 @@
 {
   "$schema": "https://json.schemastore.org/package.json",
-  "version": "1.1.43",
+  "version": "1.1.45",
   "name": "opencode",
   "type": "module",
   "license": "MIT",
diff --git a/packages/opencode/src/config/markdown.ts b/packages/opencode/src/config/markdown.ts
index 4cd17746c54..2b837a7aef7 100644
--- a/packages/opencode/src/config/markdown.ts
+++ b/packages/opencode/src/config/markdown.ts
@@ -6,6 +6,10 @@ export namespace ConfigMarkdown {
   export const FILE_REGEX = /(?<![\w`])@(\.?[^\s`,.]*(?:\.[^\s`,.]+)*)/g
   export const SHELL_REGEX = /!`([^`]+)`/g
 
+  export function substituteEnv(content: string) {
+    return content.replace(/\{env:([^}]+)\}/g, (_, varName) => process.env[varName] || "")
+  }
+
   export function files(template: string) {
     return Array.from(template.matchAll(FILE_REGEX))
   }
@@ -68,7 +72,8 @@ export namespace ConfigMarkdown {
   }
 
   export async function parse(filePath: string) {
-    const template = await Bun.file(filePath).text()
+    const raw = await Bun.file(filePath).text()
+    const template = substituteEnv(raw)
 
     try {
       const md = matter(template)
diff --git a/packages/opencode/src/session/llm.ts b/packages/opencode/src/session/llm.ts
index 4c4f4114a28..0c765210452 100644
--- a/packages/opencode/src/session/llm.ts
+++ b/packages/opencode/src/session/llm.ts
@@ -1,4 +1,3 @@
-import os from "os"
 import { Installation } from "@/installation"
 import { Provider } from "@/provider/provider"
 import { Log } from "@/util/log"
@@ -9,7 +8,6 @@ import {
   type StreamTextResult,
   type Tool,
   type ToolSet,
-  extractReasoningMiddleware,
   tool,
   jsonSchema,
 } from "ai"
@@ -261,7 +259,6 @@ export namespace LLM {
               return args.params
             },
           },
-          extractReasoningMiddleware({ tagName: "think", startWithReasoning: false }),
         ],
       }),
       experimental_telemetry: {
diff --git a/packages/opencode/test/config/fixtures/env-frontmatter.md b/packages/opencode/test/config/fixtures/env-frontmatter.md
new file mode 100644
index 00000000000..bb336d4d5b9
--- /dev/null
+++ b/packages/opencode/test/config/fixtures/env-frontmatter.md
@@ -0,0 +1,7 @@
+---
+description: "Token is {env:TEST_MCP_TOKEN}"
+note: "{env:EMPTY_ENV_VAR}"
+---
+
+Token: {env:TEST_MCP_TOKEN}
+Missing: {env:EMPTY_ENV_VAR}
diff --git a/packages/opencode/test/config/markdown.test.ts b/packages/opencode/test/config/markdown.test.ts
index c6133317e2c..138a3cca48a 100644
--- a/packages/opencode/test/config/markdown.test.ts
+++ b/packages/opencode/test/config/markdown.test.ts
@@ -1,4 +1,4 @@
-import { expect, test, describe } from "bun:test"
+import { expect, test, describe, beforeAll, afterAll } from "bun:test"
 import { ConfigMarkdown } from "../../src/config/markdown"
 
 describe("ConfigMarkdown: normal template", () => {
@@ -226,3 +226,37 @@ describe("ConfigMarkdown: frontmatter has weird model id", async () => {
     expect(result.content.trim()).toBe("Strictly follow da rules")
   })
 })
+
+describe("ConfigMarkdown: env substitution", () => {
+  const tokenKey = "TEST_MCP_TOKEN"
+  const emptyKey = "EMPTY_ENV_VAR"
+  const prevToken = process.env[tokenKey]
+  const prevEmpty = process.env[emptyKey]
+  let parsed: Awaited<ReturnType<typeof ConfigMarkdown.parse>>
+
+  beforeAll(async () => {
+    process.env[tokenKey] = "abc123"
+    delete process.env[emptyKey]
+    parsed = await ConfigMarkdown.parse(import.meta.dir + "/fixtures/env-frontmatter.md")
+  })
+
+  afterAll(() => {
+    if (prevToken === undefined) delete process.env[tokenKey]
+    else process.env[tokenKey] = prevToken
+    if (prevEmpty === undefined) delete process.env[emptyKey]
+    else process.env[emptyKey] = prevEmpty
+  })
+
+  test("should substitute env vars in frontmatter", () => {
+    expect(parsed.data.description).toBe("Token is abc123")
+  })
+
+  test("should substitute missing env vars with empty string in frontmatter", () => {
+    expect(parsed.data.note).toBe("")
+  })
+
+  test("should substitute env vars in content", () => {
+    expect(parsed.content).toContain("Token: abc123")
+    expect(parsed.content).toContain("Missing: ")
+  })
+})
diff --git a/packages/plugin/package.json b/packages/plugin/package.json
index 19077d786d6..9e9232a4da7 100644
--- a/packages/plugin/package.json
+++ b/packages/plugin/package.json
@@ -1,7 +1,7 @@
 {
   "$schema": "https://json.schemastore.org/package.json",
   "name": "@opencode-ai/plugin",
-  "version": "1.1.43",
+  "version": "1.1.45",
   "type": "module",
   "license": "MIT",
   "scripts": {
diff --git a/packages/sdk/js/package.json b/packages/sdk/js/package.json
index e929d628943..6b550512dea 100644
--- a/packages/sdk/js/package.json
+++ b/packages/sdk/js/package.json
@@ -1,7 +1,7 @@
 {
   "$schema": "https://json.schemastore.org/package.json",
   "name": "@opencode-ai/sdk",
-  "version": "1.1.43",
+  "version": "1.1.45",
   "type": "module",
   "license": "MIT",
   "scripts": {
diff --git a/packages/slack/package.json b/packages/slack/package.json
index decfd834a74..fbcccac399a 100644
--- a/packages/slack/package.json
+++ b/packages/slack/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@opencode-ai/slack",
-  "version": "1.1.43",
+  "version": "1.1.45",
   "type": "module",
   "license": "MIT",
   "scripts": {
diff --git a/packages/ui/package.json b/packages/ui/package.json
index 2e7a2cfefdf..5fde0960aca 100644
--- a/packages/ui/package.json
+++ b/packages/ui/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@opencode-ai/ui",
-  "version": "1.1.43",
+  "version": "1.1.45",
   "type": "module",
   "license": "MIT",
   "exports": {
diff --git a/packages/util/package.json b/packages/util/package.json
index f76106701b2..9a3eb8f7d33 100644
--- a/packages/util/package.json
+++ b/packages/util/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@opencode-ai/util",
-  "version": "1.1.43",
+  "version": "1.1.45",
   "private": true,
   "type": "module",
   "license": "MIT",
diff --git a/packages/web/package.json b/packages/web/package.json
index 0f601ba248f..06ab5ef4e95 100644
--- a/packages/web/package.json
+++ b/packages/web/package.json
@@ -2,7 +2,7 @@
   "name": "@opencode-ai/web",
   "type": "module",
   "license": "MIT",
-  "version": "1.1.43",
+  "version": "1.1.45",
   "scripts": {
     "dev": "astro dev",
     "dev:remote": "VITE_API_URL=https://api.opencode.ai astro dev",
diff --git a/packages/web/src/content/docs/agents.mdx b/packages/web/src/content/docs/agents.mdx
index ea1f779cd37..12504f38cd6 100644
--- a/packages/web/src/content/docs/agents.mdx
+++ b/packages/web/src/content/docs/agents.mdx
@@ -184,6 +184,38 @@ Provide constructive feedback without making direct changes.
 
 The markdown file name becomes the agent name. For example, `review.md` creates a `review` agent.
 
+#### Variables
+
+You can substitute environment variables in markdown agent files using `{env:VAR_NAME}`. This works in both frontmatter and the prompt body.
+
+```markdown title="~/.config/opencode/agents/mcdonalds.md"
+---
+name: "McDonalds"
+description: Agent to help you ordering McDonalds
+mode: primary
+model: "{env:OPENCODE_SMALL_MODEL}"
+tools:
+  question: true
+  bash: false
+  read: false
+  glob: false
+  grep: false
+  write: false
+  edit: false
+  task: false
+  todowrite: false
+  todoread: false
+  skill: false
+  "mcdonalds-mcp_*": true
+---
+
+You are a McDonalds clerk who can help user make ordering, save user money as much as possible, unless user say no.
+
+If MCP_TOKEN:`{env:MCDONALDS_MCP_TOKEN}` is empty, tell the user to apply for a token at https://open.mcd.cn/mcp/doc
+
+If MCP_TOKEN not set, it will be replaced with an empty string. Avoid echoing secrets back to the user.
+```
+
 ---
 
 ## Options
diff --git a/sdks/vscode/package.json b/sdks/vscode/package.json
index 1ffe553c2cd..7c160a454fb 100644
--- a/sdks/vscode/package.json
+++ b/sdks/vscode/package.json
@@ -2,7 +2,7 @@
   "name": "opencode",
   "displayName": "opencode",
   "description": "opencode for VS Code",
-  "version": "1.1.43",
+  "version": "1.1.45",
   "publisher": "sst-dev",
   "repository": {
     "type": "git",