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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: Build tools inject hardcoded -configuration Debug, overriding the scheme's configuration","articleBody":"### Bug Description\n\nWhen no `configuration` is provided (neither as a tool parameter nor a session default), every build/test/path tool injects `-configuration Debug` into the `xcodebuild` invocation. This overrides the configuration that the scheme's Run action would otherwise select.\n\n`xcodebuild`, run on its own, picks the configuration from the scheme. By always passing `-configuration Debug`, XcodeBuildMCP forces resolution against `Debug.xcconfig` instead of the scheme's actual Run configuration. In a project where the scheme's Run action uses a custom configuration (e.g. `Debug-dev`), this produces the wrong build settings — including the wrong bundle identifier.\n\nConcrete example from a real project:\n- Scheme's Run action configuration: `Debug-dev` -\u003e `Development.xcconfig` -\u003e `com.example.app.dev` (expected)\n- Forced `-configuration Debug` -\u003e `Debug.xcconfig` -\u003e `com.example.app` (what actually gets built)\n\n### Debug Output\n\n```\n⚙️ XcodeBuildMCP Doctor\n\n   Generated: 2026-06-03T14:21:14.316Z\n   Server Version: 2.6.2\n   Output Mode: Redacted (default)\n\nSystem Information\n  platform: darwin\n  release: 25.5.0\n  arch: arm64\n  cpus: 10 x Apple M1 Pro\n  memory: 32 GB\n\nNode.js Information\n  version: v25.2.1\n  platform: darwin\n  arch: arm64\n\nXcode Information\n  version: Xcode 26.5 - Build version 17F42\n  path: /Applications/Xcode-26.5.0.app/Contents/Developer\n  selectedXcode: /Applications/Xcode-26.5.0.app/Contents/Developer/usr/bin/xcodebuild\n  xcrunVersion: xcrun version 72.\n\nDependencies\n  axe: 1.7.1\n  mise: 2026.5.18 macos-arm64 (2026-05-31)\n\nEnvironment Variables\n  XCODEBUILDMCP_RUNTIME: cli\n  XCODEBUILDMCP_SILENCE_LOGS: true\n\nUI Automation (axe)\n  Available: Yes\n  UI Automation Supported: Yes\n\nManifest Tool Inventory\n  Total Unique Tools: 82\n  Workflow Count: 15\n\nTool Availability Summary\n  Build Tools: Available\n  UI Automation Tools: Available\n  Incremental Build Support: Not available\n\nSentry\n  Sentry enabled: Yes\n\n✅ Doctor diagnostics complete\n```\n\n### Editor/Client\n\nClaude Code\n\n### MCP Server Version\n\n2.6.2\n\n### LLM\n\nClaude Opus 4.8\n\n### MCP Configuration\n\n```json\n\"XcodeBuildMCP\": {\n    \"args\": [\n      \"-y\",\n      \"xcodebuildmcp@latest\",\n      \"mcp\"\n    ],\n    \"command\": \"npx\",\n    \"env\": {},\n    \"type\": \"stdio\"\n  }\n```\n\n### Steps to Reproduce\n\n1. Use a project whose scheme's Run action is set to a non-`Debug` configuration (e.g. `Debug-dev`).\n2. Ask the agent to build for simulator/device without specifying a `configuration`, and without a `configuration` session default set.\n3. Inspect the generated `xcodebuild` command in the build log.\n\n### Expected Behavior\n\nWhen neither an explicit `configuration` argument nor a session default is set, `-configuration` should be omitted so `xcodebuild` honors the scheme's configuration for the chosen action.\n\n### Actual Behavior\n\n`-configuration Debug` is always passed, silently overriding the scheme and producing the wrong build settings/bundle id for projects whose scheme uses a non-`Debug` Run configuration.\n\nRoot cause:\n\n```ts\n// src/mcp/tools/simulator/build_sim.ts:103 (same pattern in device/macos/clean/path tools)\nconst configuration = params.configuration ?? 'Debug';\n```\n\n```ts\n// src/utils/build-utils.ts:97 — pushed unconditionally\ncommand.push('-configuration', params.configuration);\n```\n\n`SharedBuildParams.configuration` is typed as required `string` (`src/types/common.ts:135`), so no code path omits the flag. Session defaults allow `configuration: string | null` and only merge concrete non-null values, so an unset configuration always falls through to the hardcoded `Debug`.\n\n### Error Messages\n\n(none — silent wrong-config build)\n","author":{"url":"https://github.com/hujunfeng","@type":"Person","name":"hujunfeng"},"datePublished":"2026-06-03T14:27:08.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/443/XcodeBuildMCP/issues/443"}