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WHEN: 'mock API responses', 'simulate API errors', 'test rate limiting', 'test error handling', 'mock OpenAI responses', 'test AI app', 'analyze API usage', 'configure Dev Proxy', 'install Dev Proxy', 'set up Dev Proxy', 'use Dev Proxy in CI\u002FCD', 'chaos testing for APIs', 'run Dev Proxy in background', 'detached mode', 'run Dev Proxy detached'.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},"dotnet",".NET (Microsoft)","https:\u002F\u002Fpexgzepcugksgbtrxkhf.supabase.co\u002Fstorage\u002Fv1\u002Fobject\u002Fpublic\u002Forg-logos\u002Fdotnet.png",[12,16,19,22],{"name":13,"slug":14,"type":15},"Observability","observability","tag",{"name":17,"slug":18,"type":15},"API Development","api-development",{"name":20,"slug":21,"type":15},"Testing","testing",{"name":23,"slug":24,"type":15},"Debugging","debugging",801,"https:\u002F\u002Fgithub.com\u002Fdotnet\u002Fdev-proxy","2026-07-12T08:21:24.806721",null,86,[31,32,4,33,34,35,36,37,38,39,40,41,42,43,44],"api-testing","chaos-engineering","developer-tools","development","devtools","hacktoberfest","http","microsoft-365","microsoft-graph","mock-server","openapi","proxy","resilience","rest",{"repoUrl":26,"stars":25,"forks":29,"topics":46,"description":47},[31,32,4,33,34,35,36,37,38,39,40,41,42,43,44],"Simulate API failures, throttling, and chaos — all from your command line.","https:\u002F\u002Fgithub.com\u002Fdotnet\u002Fdev-proxy\u002Ftree\u002FHEAD\u002Fskills\u002Fdev-proxy","---\nname: dev-proxy\nmetadata:\n  version: 1.1.0\ndescription: \"Simulate API failures, mock responses, test rate limiting, and analyze API traffic using Dev Proxy's plugin-based proxy engine. WHEN: 'mock API responses', 'simulate API errors', 'test rate limiting', 'test error handling', 'mock OpenAI responses', 'test AI app', 'analyze API usage', 'configure Dev Proxy', 'install Dev Proxy', 'set up Dev Proxy', 'use Dev Proxy in CI\u002FCD', 'chaos testing for APIs', 'run Dev Proxy in background', 'detached mode', 'run Dev Proxy detached'.\"\n---\n\n# Dev Proxy\n\nDev Proxy is a command-line API simulator and proxy for testing how applications handle API failures, rate limits, latency, and more. It uses a plugin-based architecture configured through JSON configuration files.\n\n## Prerequisites\n\nBefore proceeding, verify that Dev Proxy is installed by running `devproxy --version`. If the command fails or Dev Proxy is not found:\n\nSTOP — Read [references\u002Finstallation.md](references\u002Finstallation.md) for platform-specific installation instructions (macOS, Windows, Linux), first-run certificate setup, and verification steps.\n\n## Quick Start\n\nStore all Dev Proxy files in `.devproxy\u002F` in the workspace root. Start with:\n\n```bash\ndevproxy --config-file .devproxy\u002Fdevproxyrc.json\n```\n\nSTOP — Before creating or modifying any Dev Proxy configuration, read [references\u002Fbest-practices.md](references\u002Fbest-practices.md) for critical rules on file structure, plugin ordering, URL matching, and configuration patterns.\n\n## Scenario Selection\n\nIdentify the user's scenario and load the corresponding reference file for detailed instructions.\n\n### Mock API Responses\n\nReturn predefined responses, simulate CRUD APIs, mock MCP servers, or simulate authentication.\n\n**Plugins:** `MockResponsePlugin`, `CrudApiPlugin`, `GraphMockResponsePlugin`, `MockStdioResponsePlugin`, `AuthPlugin`\n\nSTOP — Read [references\u002Fmock-api-responses.md](references\u002Fmock-api-responses.md) for mock file structure, matching rules, dynamic responses, CRUD API definitions, STDIO mocks, and auth simulation.\n\n### Test API Resilience\n\nSimulate API failures, rate limits, throttling, and slow responses to verify error handling.\n\n**Plugins:** `GenericRandomErrorPlugin`, `GraphRandomErrorPlugin`, `RateLimitingPlugin`, `RetryAfterPlugin`, `LatencyPlugin`\n\nSTOP — Read [references\u002Ftest-api-resilience.md](references\u002Ftest-api-resilience.md) for error injection configs, rate limiting setup, throttling simulation, and latency testing.\n\n### Test LLM Applications\n\nMock OpenAI\u002FAzure OpenAI responses, simulate LLM failures, enforce token-based rate limits, and monitor usage.\n\n**Plugins:** `OpenAIMockResponsePlugin`, `LanguageModelFailurePlugin`, `LanguageModelRateLimitingPlugin`, `OpenAITelemetryPlugin`, `OpenAIUsageDebuggingPlugin`, `MockStdioResponsePlugin`\n\nSTOP — Read [references\u002Ftest-llm-apps.md](references\u002Ftest-llm-apps.md) for LLM mocking with local models, failure simulation, token rate limiting, telemetry dashboards, and MCP server testing.\n\n### Analyze API Usage\n\nRecord traffic and generate reports, specs, and governance insights.\n\n**Plugins:** `OpenApiSpecGeneratorPlugin`, `TypeSpecGeneratorPlugin`, `HttpFileGeneratorPlugin`, `HarGeneratorPlugin`, `ExecutionSummaryPlugin`, `UrlDiscoveryPlugin`, `MockGeneratorPlugin`, `GraphMinimalPermissionsPlugin`, `GraphMinimalPermissionsGuidancePlugin`, `ApiCenterOnboardingPlugin`, `ApiCenterProductionVersionPlugin`\n\nSTOP — Read [references\u002Fanalyze-api-usage.md](references\u002Fanalyze-api-usage.md) for recording workflow, spec generation, permission analysis, shadow API detection, and reporting.\n\n### CI\u002FCD Integration\n\nAutomate API testing in GitHub Actions, Azure Pipelines, or any CI system.\n\nSTOP — Read [references\u002Fci-cd-integration.md](references\u002Fci-cd-integration.md) for GitHub Actions setup, Azure Pipelines config, general CI patterns, and pipeline templates.\n\n### Configuration & Plugin Reference\n\nSet up Dev Proxy, understand plugin architecture, URL matching, proxy settings, and detached (background) mode.\n\nSTOP — Read [references\u002Fconfiguration.md](references\u002Fconfiguration.md) for config file structure, plugin types and ordering, URL matching rules, proxy settings, detached mode, and process filtering. For the full plugin catalog, read [references\u002Fplugin-catalog.md](references\u002Fplugin-catalog.md).\n\n## Configuration File Structure\n\nA quick reference. All configuration details are in [references\u002Fconfiguration.md](references\u002Fconfiguration.md).\n\n```json\n{\n  \"$schema\": \"https:\u002F\u002Fraw.githubusercontent.com\u002Fdotnet\u002Fdev-proxy\u002Fmain\u002Fschemas\u002Fv3.0.0\u002Frc.schema.json\",\n  \"plugins\": [\n    {\n      \"name\": \"PluginName\",\n      \"enabled\": true,\n      \"pluginPath\": \"~appFolder\u002Fplugins\u002FDevProxy.Plugins.dll\",\n      \"configSection\": \"pluginConfig\"\n    }\n  ],\n  \"urlsToWatch\": [\"https:\u002F\u002Fapi.contoso.com\u002F*\"],\n  \"pluginConfig\": {\n    \"$schema\": \"https:\u002F\u002Fraw.githubusercontent.com\u002Fdotnet\u002Fdev-proxy\u002Fmain\u002Fschemas\u002Fv3.0.0\u002Fpluginname.schema.json\"\n  }\n}\n```\n\n### Critical Rules\n\n- Property order: `$schema` → `plugins` → `urlsToWatch` → plugin config sections → general settings\n- `pluginPath` is always `~appFolder\u002Fplugins\u002FDevProxy.Plugins.dll`\n- Schema version must match the installed Dev Proxy version\n- Reporter plugins MUST be listed AFTER reporting plugins\n- Plugin execution order follows the config array order\n- File paths are relative to the config file where they are defined\n- Configuration hot-reloads on file save (v2.1.0+)\n\n### Plugin Ordering\n\n1. `RetryAfterPlugin` first (when simulating throttling)\n2. `LatencyPlugin` before mock\u002Ferror plugins\n3. `AuthPlugin` before mock plugins\n4. 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USE WHEN a multi-project solution build is slower than expected, doesn't speed up when you add cores, pegs a single core while others idle, or you want to know why `-m` isn't helping. Note: `\u002Fmaxcpucount` default is 1 (sequential) — always pass `-m` for parallel builds. Covers finding the critical path (longest serial ProjectReference chain), graph build (`\u002Fgraph`), BuildInParallel, and solution filters (`.slnf`). DO NOT USE FOR: single-project builds, incremental issues (use incremental-build), compilation slowness inside one project (use build-perf-diagnostics), non-MSBuild build systems.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1216,1217,1218],{"name":1099,"slug":1100,"type":15},{"name":1102,"slug":1103,"type":15},{"name":1105,"slug":1106,"type":15},"2026-07-19T05:38:18.364937",{"slug":1221,"name":1221,"fn":1222,"description":1223,"org":1224,"tags":1225,"stars":1122,"repoUrl":1123,"updatedAt":1232},"build-perf-baseline","establish and optimize build performance baselines","Establish build performance baselines and apply systematic optimization techniques. USE FOR: diagnosing slow builds, establishing before\u002Fafter measurements (cold, warm, no-op scenarios), applying optimization strategies like MSBuild Server, static graph builds, artifacts output, and dependency graph trimming. Start here before diving into build-perf-diagnostics, incremental-build, or build-parallelism. DO NOT USE FOR: non-MSBuild build systems, detailed bottleneck analysis (use build-perf-diagnostics after baselining).",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1226,1227,1230,1231],{"name":1102,"slug":1103,"type":15},{"name":1228,"slug":1229,"type":15},"Monitoring","monitoring",{"name":1105,"slug":1106,"type":15},{"name":20,"slug":21,"type":15},"2026-07-12T08:21:35.865649",{"slug":1234,"name":1234,"fn":1235,"description":1236,"org":1237,"tags":1238,"stars":1122,"repoUrl":1123,"updatedAt":1243},"build-perf-diagnostics","diagnose MSBuild build performance bottlenecks","Diagnose MSBuild build performance bottlenecks using binary log analysis. USE FOR: identifying why builds are slow by analyzing binlog performance summaries, detecting ResolveAssemblyReference (RAR) taking >5s, Roslyn analyzers consuming >30% of Csc time, single targets dominating >50% of build time, node utilization below 80%, excessive Copy tasks, NuGet restore running every build. Covers timeline analysis, Target\u002FTask Performance Summary interpretation, and 7 common bottleneck categories. Use after build-perf-baseline has established measurements. DO NOT USE FOR: establishing initial baselines (use build-perf-baseline first), fixing incremental build issues (use incremental-build), parallelism tuning (use build-parallelism), non-MSBuild build systems.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1239,1240,1241,1242],{"name":1099,"slug":1100,"type":15},{"name":23,"slug":24,"type":15},{"name":1102,"slug":1103,"type":15},{"name":1105,"slug":1106,"type":15},"2026-07-12T08:21:40.961722",{"slug":1245,"name":1245,"fn":1246,"description":1247,"org":1248,"tags":1249,"stars":1122,"repoUrl":1123,"updatedAt":1253},"check-bin-obj-clash","detect MSBuild output path conflicts","Detects MSBuild projects with conflicting OutputPath or IntermediateOutputPath. USE FOR: builds failing with 'Cannot create a file when that file already exists', 'The process cannot access the file because it is being used by another process', intermittent build failures that succeed on retry, or missing\u002Foverwritten outputs in multi-project or multi-targeting builds where bin\u002Fobj (or project.assets.json) collide. Common causes: shared OutputPath, missing AppendTargetFrameworkToOutputPath, extra global properties (e.g. PublishReadyToRun), or SetTargetFramework on a ProjectReference to a single-targeting project. DO NOT USE FOR: file access errors unrelated to MSBuild (OS-level locking), single-project single-TFM builds, non-MSBuild build systems.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1250,1251,1252],{"name":23,"slug":24,"type":15},{"name":1102,"slug":1103,"type":15},{"name":1164,"slug":1165,"type":15},"2026-07-19T05:38:14.336279",144,{"items":1256,"total":139},[1257],{"slug":4,"name":4,"fn":5,"description":6,"org":1258,"tags":1259,"stars":25,"repoUrl":26,"updatedAt":27},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1260,1261,1262,1263],{"name":17,"slug":18,"type":15},{"name":23,"slug":24,"type":15},{"name":13,"slug":14,"type":15},{"name":20,"slug":21,"type":15}]