[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"skill-posthog-diagnosing-stacktrace-symbolication":3,"mdc--q3rbwn-key":56,"related-repo-posthog-diagnosing-stacktrace-symbolication":1044,"related-org-posthog-diagnosing-stacktrace-symbolication":1144},{"slug":4,"name":4,"fn":5,"description":6,"org":7,"tags":11,"stars":32,"repoUrl":33,"updatedAt":34,"license":35,"forks":36,"topics":37,"repo":51,"sourceUrl":54,"mdContent":55},"diagnosing-stacktrace-symbolication","debug PostHog stack-trace symbolication","Help users debug PostHog Error Tracking stack-trace symbolication for any supported platform — JavaScript\u002FTypeScript web, React Native (Hermes), Android (Proguard \u002F R8), or iOS \u002F macOS (dSYM). The PostHog symbol-set lookup flow is universal across platforms; build-tool and artifact details live in per-platform references (JavaScript is fleshed out, others come as we encounter them). Use when stack frames stay minified or obfuscated after symbols are uploaded, PostHog symbol sets show last_used but frames are not readable, chunk IDs or dSYM UUIDs do not match, \"Token not found\" appears, uploaded source maps \u002F dSYMs \u002F Proguard mappings look empty, or bundler \u002F symbol-upload configuration needs troubleshooting.\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},"posthog","PostHog","https:\u002F\u002Fpexgzepcugksgbtrxkhf.supabase.co\u002Fstorage\u002Fv1\u002Fobject\u002Fpublic\u002Forg-logos\u002Fposthog.png",[12,16,19,20,23,26,29],{"name":13,"slug":14,"type":15},"Observability","observability","tag",{"name":17,"slug":18,"type":15},"Android","android",{"name":9,"slug":8,"type":15},{"name":21,"slug":22,"type":15},"iOS","ios",{"name":24,"slug":25,"type":15},"TypeScript","typescript",{"name":27,"slug":28,"type":15},"JavaScript","javascript",{"name":30,"slug":31,"type":15},"Debugging","debugging",35568,"https:\u002F\u002Fgithub.com\u002FPostHog\u002Fposthog","2026-05-20T07:04:27.132121",null,2977,[38,39,40,41,42,43,44,28,45,46,47,48,49,25,50],"ab-testing","ai-analytics","analytics","cdp","data-warehouse","experiments","feature-flags","product-analytics","python","react","session-replay","surveys","web-analytics",{"repoUrl":33,"stars":32,"forks":36,"topics":52,"description":53},[38,39,40,41,42,43,44,28,45,46,47,48,49,25,50],"🦔 PostHog is an all-in-one developer platform for building successful products. We offer product analytics, web analytics, session replay, error tracking, feature flags, experimentation, surveys, data warehouse, a CDP, and an AI product assistant to help debug your code, ship features faster, and keep all your usage and customer data in one stack.","https:\u002F\u002Fgithub.com\u002FPostHog\u002Fposthog\u002Ftree\u002FHEAD\u002Fproducts\u002Ferror_tracking\u002Fskills\u002Fdiagnosing-stacktrace-symbolication","---\nname: diagnosing-stacktrace-symbolication\ndescription: >\n  Help users debug PostHog Error Tracking stack-trace symbolication for any supported platform — JavaScript\u002FTypeScript\n  web, React Native (Hermes), Android (Proguard \u002F R8), or iOS \u002F macOS (dSYM). The PostHog symbol-set lookup flow is\n  universal across platforms; build-tool and artifact details live in per-platform references (JavaScript is fleshed\n  out, others come as we encounter them). Use when stack frames stay minified or obfuscated after symbols are\n  uploaded, PostHog symbol sets show last_used but frames are not readable, chunk IDs or dSYM UUIDs do not match,\n  \"Token not found\" appears, uploaded source maps \u002F dSYMs \u002F Proguard mappings look empty, or bundler \u002F\n  symbol-upload configuration needs troubleshooting.\n---\n\n# Diagnosing stack-trace symbolication\n\nSymbolication is the cross-platform name for what JavaScript source-map lookup, Hermes function-offset resolution,\nProguard \u002F R8 demangling, and dSYM address-to-line lookup all do — turn a minified or obfuscated frame back into a\nreadable file, function, and line.\n\nWork through the user's build and PostHog symbol sets as one pipeline: build config -> generated symbol artifacts\n(JavaScript source maps, Hermes maps, Proguard mappings, or dSYM bundles) -> uploaded symbol set in PostHog ->\ncaptured error frame. Most failures become obvious once those four pieces are checked in order.\n\n## Platforms\n\n| Platform                    | Symbol-data type | Reference                                   |\n| --------------------------- | ---------------- | ------------------------------------------- |\n| JavaScript \u002F TypeScript web | source-and-map   | [javascript.md](.\u002Freferences\u002Fjavascript.md) |\n| React Native (Hermes)       | hermes           | _coming soon_                               |\n| Android (Proguard \u002F R8)     | proguard         | _coming soon_                               |\n| iOS \u002F macOS (dSYM)          | apple-dsym       | _coming soon_                               |\n\nStep 3 of the workflow (symbol-set lookup in PostHog) is identical across platforms — `posthog-cli symbol-sets\nextract` handles all four container types. Steps 1, 2, and the platform-specific failure modes live in the\nper-platform reference.\n\n## Workflow\n\n### Step 1 - Find how symbol data is produced and uploaded\n\nLook at the app repo's build scripts and PostHog upload config. Confirm which PostHog package handles the upload\n(`@posthog\u002Frollup-plugin`, `@posthog\u002Fwebpack-plugin`, `@posthog\u002Fnextjs-config`, `@posthog\u002Fnuxt`, or direct\n`posthog-cli`) and which directory or asset it processes. See the platform reference for build-tool-specific\nconfig inspection.\n\nFor debugging, prefer a build where symbol artifacts remain on disk after upload so you can compare local\nartifacts against what PostHog received. JavaScript example with the Vite plugin (the platform reference covers\nthe equivalent setting for other build tools):\n\n```ts\nsourcemaps: {\n  enabled: true,\n  deleteAfterUpload: false,\n}\n```\n\n### Step 2 - Build and inspect local artifacts\n\nRun the production build that uploads symbols, then inspect the emitted files locally. The exact files and helper\ninvocation differ per platform — see the platform reference for the helper command, expected file shape, and common\nbuild-time pitfalls (notably empty-mappings false positives that look like upload bugs but are actually bundler\nconfig issues).\n\nIf local artifacts already look wrong, fix the build before debugging the PostHog upload.\n\n### Step 3 - Check symbol sets in PostHog\n\nLook up the symbol set whose `ref` matches the captured frame's `chunk_id` using the dedicated MCP tools — they\nhandle auth, project scoping, and pagination automatically:\n\n- `posthog:error-tracking-symbol-sets-list` with `ref=\u003Cchunk_id>` returns the matching row.\n- `posthog:error-tracking-symbol-sets-retrieve` with the ID returns the same shape (and confirms permissions).\n- `posthog:error-tracking-symbol-sets-download-retrieve` returns a one-hour presigned URL pointing at the uploaded\n  symbol-data file. Download it immediately; do not echo the URL back unless the user explicitly asks.\n\nIf MCP access is not available, the same data is in **Project settings > Error tracking > Symbol sets** in the\nPostHog UI.\n\nInterpret the row:\n\n- `ref` must match the captured frame `chunk_id`.\n- `last_used` updating means PostHog found and loaded that symbol set. It does not guarantee the frame resolved.\n- `has_uploaded_file: false` means the upload did not complete.\n- A non-null `failure_reason` means PostHog could not parse or load the uploaded symbol data.\n\nThe downloaded file is a PostHog symbol-data container (compressed Rust-encoded payload), not plain JSON. Extract\nit with `posthog-cli`:\n\n```bash\nposthog-cli symbol-sets extract symbolset.bin -o .\u002Fextracted\n# or, without installing globally:\n#   npx @posthog\u002Fcli symbol-sets extract symbolset.bin -o .\u002Fextracted\n#   bunx @posthog\u002Fcli symbol-sets extract symbolset.bin -o .\u002Fextracted\n```\n\n`posthog-cli symbol-sets extract` handles all four symbol-set types (source-and-map, hermes, proguard, dSYM) and\nwrites the extracted files into the output directory. Once extracted, summarize using the platform reference's\nhelper.\n\n### Step 4 - Compare local, uploaded, and served files\n\nUse the failure location to decide what to compare:\n\n- Local artifact empty and uploaded artifact empty: build tool emitted unusable symbols.\n- Local artifact valid but uploaded artifact empty: upload processing selected or packed the wrong data.\n- Uploaded artifact valid but production stack stays minified or obfuscated: compare deployed binary bytes to the\n  binary that was uploaded with the symbols.\n- `Token not found`: PostHog loaded the symbol data but the captured generated position did not match any token in\n  the uploaded artifact. Usually points to a changed binary after upload, wrong line \u002F column capture (JavaScript)\n  or wrong frame offset (Hermes \u002F dSYM), or a symbol-coverage bug.\n\n### Step 5 - Fix the most likely layer\n\nPlatform-neutral fixes:\n\n- Upload symbols after the final build output exists, not before a later step rewrites it.\n- Use the latest PostHog build plugin and `posthog-cli`.\n- Re-upload changed assets intentionally when the same `ref` was previously uploaded with different content.\n- Remove deployment-time transforms (CDN minify, edge rewrites, compression) that change the served binary after\n  upload.\n\nPlatform-specific fixes live in the platform reference.\n\n## Captured frame checks\n\nFrom an affected PostHog error event, collect one minified application frame:\n\n- `filename`\n- `line` or `lineno`\n- `column` or `colno`\n- `function`\n- `chunk_id` (or platform-equivalent symbol-set ref)\n- any `resolve_failure`, especially `Token not found`\n\nThe frame `filename` should match the deployed binary URL. The `chunk_id` should match the symbol set `ref`. The\ncaptured generated position should point into the same binary that was uploaded with the symbol data.\n\n## Failure matrix (cross-platform)\n\n| Evidence                                         | Likely cause                                                            | Next check                                                                    |\n| ------------------------------------------------ | ----------------------------------------------------------------------- | ----------------------------------------------------------------------------- |\n| No `chunk_id` on frames                          | Chunk ID injection missing or SDK frame parser did not map the filename | Inspect deployed binary and raw frame filenames.                              |\n| Symbol set row missing                           | Upload went to another PostHog project\u002Fhost or skipped this asset       | Compare plugin `projectId`, `host`, and `ref`.                                |\n| `has_uploaded_file: false`                       | Upload did not finish                                                   | Check build logs; compare `posthog-cli` output to the symbol set row.         |\n| Non-null `failure_reason`                        | PostHog could not parse the uploaded symbol data                        | Download via Step 3 and inspect the extracted contents.                       |\n| Uploaded artifact valid, deployed binary differs | Deployment\u002FCDN\u002Fpost-build transform changed the binary after upload     | Compare deployed bytes to local build output.                                 |\n| `Token not found`                                | Captured position has no token in the uploaded symbol data              | Verify captured position, deployed binary identity, and symbol-data coverage. |\n\nPlatform-specific failure modes (empty `mappings`, missing `sourcesContent`, Hermes function-offset mismatch,\nProguard class-name drift, dSYM UUID mismatch) live in the platform reference.\n",{"data":57,"body":58},{"name":4,"description":6},{"type":59,"children":60},"root",[61,70,76,81,88,206,220,226,233,276,281,370,376,381,386,392,413,459,472,477,532,543,610,620,626,631,660,666,671,707,712,718,723,804,830,836,1017,1038],{"type":62,"tag":63,"props":64,"children":66},"element","h1",{"id":65},"diagnosing-stack-trace-symbolication",[67],{"type":68,"value":69},"text","Diagnosing stack-trace symbolication",{"type":62,"tag":71,"props":72,"children":73},"p",{},[74],{"type":68,"value":75},"Symbolication is the cross-platform name for what JavaScript source-map lookup, Hermes function-offset resolution,\nProguard \u002F R8 demangling, and dSYM address-to-line lookup all do — turn a minified or obfuscated frame back into a\nreadable file, function, and line.",{"type":62,"tag":71,"props":77,"children":78},{},[79],{"type":68,"value":80},"Work through the user's build and PostHog symbol sets as one pipeline: build config -> generated symbol artifacts\n(JavaScript source maps, Hermes maps, Proguard mappings, or dSYM bundles) -> uploaded symbol set in PostHog ->\ncaptured error frame. 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JavaScript example with the Vite plugin (the platform reference covers\nthe equivalent setting for other build tools):",{"type":62,"tag":282,"props":283,"children":288},"pre",{"className":284,"code":285,"language":286,"meta":287,"style":287},"language-ts shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","sourcemaps: {\n  enabled: true,\n  deleteAfterUpload: false,\n}\n","ts","",[289],{"type":62,"tag":212,"props":290,"children":291},{"__ignoreMap":287},[292,315,339,361],{"type":62,"tag":293,"props":294,"children":297},"span",{"class":295,"line":296},"line",1,[298,304,310],{"type":62,"tag":293,"props":299,"children":301},{"style":300},"--shiki-light:#E2931D;--shiki-default:#FFCB6B;--shiki-dark:#FFCB6B",[302],{"type":68,"value":303},"sourcemaps",{"type":62,"tag":293,"props":305,"children":307},{"style":306},"--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF",[308],{"type":68,"value":309},":",{"type":62,"tag":293,"props":311,"children":312},{"style":306},[313],{"type":68,"value":314}," {\n",{"type":62,"tag":293,"props":316,"children":318},{"class":295,"line":317},2,[319,324,328,334],{"type":62,"tag":293,"props":320,"children":321},{"style":300},[322],{"type":68,"value":323},"  enabled",{"type":62,"tag":293,"props":325,"children":326},{"style":306},[327],{"type":68,"value":309},{"type":62,"tag":293,"props":329,"children":331},{"style":330},"--shiki-light:#FF5370;--shiki-default:#FF9CAC;--shiki-dark:#FF9CAC",[332],{"type":68,"value":333}," true",{"type":62,"tag":293,"props":335,"children":336},{"style":306},[337],{"type":68,"value":338},",\n",{"type":62,"tag":293,"props":340,"children":342},{"class":295,"line":341},3,[343,348,352,357],{"type":62,"tag":293,"props":344,"children":345},{"style":300},[346],{"type":68,"value":347},"  deleteAfterUpload",{"type":62,"tag":293,"props":349,"children":350},{"style":306},[351],{"type":68,"value":309},{"type":62,"tag":293,"props":353,"children":354},{"style":330},[355],{"type":68,"value":356}," false",{"type":62,"tag":293,"props":358,"children":359},{"style":306},[360],{"type":68,"value":338},{"type":62,"tag":293,"props":362,"children":364},{"class":295,"line":363},4,[365],{"type":62,"tag":293,"props":366,"children":367},{"style":306},[368],{"type":68,"value":369},"}\n",{"type":62,"tag":227,"props":371,"children":373},{"id":372},"step-2-build-and-inspect-local-artifacts",[374],{"type":68,"value":375},"Step 2 - Build and inspect local artifacts",{"type":62,"tag":71,"props":377,"children":378},{},[379],{"type":68,"value":380},"Run the production build that uploads symbols, then inspect the emitted files locally. The exact files and helper\ninvocation differ per platform — see the platform reference for the helper command, expected file shape, and common\nbuild-time pitfalls (notably empty-mappings false positives that look like upload bugs but are actually bundler\nconfig issues).",{"type":62,"tag":71,"props":382,"children":383},{},[384],{"type":68,"value":385},"If local artifacts already look wrong, fix the build before debugging the PostHog upload.",{"type":62,"tag":227,"props":387,"children":389},{"id":388},"step-3-check-symbol-sets-in-posthog",[390],{"type":68,"value":391},"Step 3 - Check symbol sets in PostHog",{"type":62,"tag":71,"props":393,"children":394},{},[395,397,403,405,411],{"type":68,"value":396},"Look up the symbol set whose ",{"type":62,"tag":212,"props":398,"children":400},{"className":399},[],[401],{"type":68,"value":402},"ref",{"type":68,"value":404}," matches the captured frame's ",{"type":62,"tag":212,"props":406,"children":408},{"className":407},[],[409],{"type":68,"value":410},"chunk_id",{"type":68,"value":412}," using the dedicated MCP tools — they\nhandle auth, project scoping, and pagination automatically:",{"type":62,"tag":414,"props":415,"children":416},"ul",{},[417,437,448],{"type":62,"tag":418,"props":419,"children":420},"li",{},[421,427,429,435],{"type":62,"tag":212,"props":422,"children":424},{"className":423},[],[425],{"type":68,"value":426},"posthog:error-tracking-symbol-sets-list",{"type":68,"value":428}," with ",{"type":62,"tag":212,"props":430,"children":432},{"className":431},[],[433],{"type":68,"value":434},"ref=\u003Cchunk_id>",{"type":68,"value":436}," returns the matching row.",{"type":62,"tag":418,"props":438,"children":439},{},[440,446],{"type":62,"tag":212,"props":441,"children":443},{"className":442},[],[444],{"type":68,"value":445},"posthog:error-tracking-symbol-sets-retrieve",{"type":68,"value":447}," with the ID returns the same shape (and confirms permissions).",{"type":62,"tag":418,"props":449,"children":450},{},[451,457],{"type":62,"tag":212,"props":452,"children":454},{"className":453},[],[455],{"type":68,"value":456},"posthog:error-tracking-symbol-sets-download-retrieve",{"type":68,"value":458}," returns a one-hour presigned URL pointing at the uploaded\nsymbol-data file. 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Once extracted, summarize using the platform reference's\nhelper.",{"type":62,"tag":227,"props":621,"children":623},{"id":622},"step-4-compare-local-uploaded-and-served-files",[624],{"type":68,"value":625},"Step 4 - Compare local, uploaded, and served files",{"type":62,"tag":71,"props":627,"children":628},{},[629],{"type":68,"value":630},"Use the failure location to decide what to compare:",{"type":62,"tag":414,"props":632,"children":633},{},[634,639,644,649],{"type":62,"tag":418,"props":635,"children":636},{},[637],{"type":68,"value":638},"Local artifact empty and uploaded artifact empty: build tool emitted unusable symbols.",{"type":62,"tag":418,"props":640,"children":641},{},[642],{"type":68,"value":643},"Local artifact valid but uploaded artifact empty: upload processing selected or packed the wrong data.",{"type":62,"tag":418,"props":645,"children":646},{},[647],{"type":68,"value":648},"Uploaded artifact valid but production stack stays minified or obfuscated: compare deployed binary bytes to the\nbinary that was uploaded with the symbols.",{"type":62,"tag":418,"props":650,"children":651},{},[652,658],{"type":62,"tag":212,"props":653,"children":655},{"className":654},[],[656],{"type":68,"value":657},"Token not found",{"type":68,"value":659},": PostHog loaded the symbol data but the captured generated position did not match any token in\nthe uploaded artifact. Usually points to a changed binary after upload, wrong line \u002F column capture (JavaScript)\nor wrong frame offset (Hermes \u002F dSYM), or a symbol-coverage bug.",{"type":62,"tag":227,"props":661,"children":663},{"id":662},"step-5-fix-the-most-likely-layer",[664],{"type":68,"value":665},"Step 5 - Fix the most likely layer",{"type":62,"tag":71,"props":667,"children":668},{},[669],{"type":68,"value":670},"Platform-neutral fixes:",{"type":62,"tag":414,"props":672,"children":673},{},[674,679,690,702],{"type":62,"tag":418,"props":675,"children":676},{},[677],{"type":68,"value":678},"Upload symbols after the final build output exists, not before a later step rewrites it.",{"type":62,"tag":418,"props":680,"children":681},{},[682,684,689],{"type":68,"value":683},"Use the latest PostHog build plugin and ",{"type":62,"tag":212,"props":685,"children":687},{"className":686},[],[688],{"type":68,"value":273},{"type":68,"value":496},{"type":62,"tag":418,"props":691,"children":692},{},[693,695,700],{"type":68,"value":694},"Re-upload changed assets intentionally when the same ",{"type":62,"tag":212,"props":696,"children":698},{"className":697},[],[699],{"type":68,"value":402},{"type":68,"value":701}," was previously uploaded with different content.",{"type":62,"tag":418,"props":703,"children":704},{},[705],{"type":68,"value":706},"Remove deployment-time transforms (CDN minify, edge rewrites, compression) that change the served binary after\nupload.",{"type":62,"tag":71,"props":708,"children":709},{},[710],{"type":68,"value":711},"Platform-specific fixes live in the platform reference.",{"type":62,"tag":82,"props":713,"children":715},{"id":714},"captured-frame-checks",[716],{"type":68,"value":717},"Captured frame checks",{"type":62,"tag":71,"props":719,"children":720},{},[721],{"type":68,"value":722},"From an affected PostHog error event, collect one minified application frame:",{"type":62,"tag":414,"props":724,"children":725},{},[726,735,751,767,776,786],{"type":62,"tag":418,"props":727,"children":728},{},[729],{"type":62,"tag":212,"props":730,"children":732},{"className":731},[],[733],{"type":68,"value":734},"filename",{"type":62,"tag":418,"props":736,"children":737},{},[738,743,745],{"type":62,"tag":212,"props":739,"children":741},{"className":740},[],[742],{"type":68,"value":295},{"type":68,"value":744}," or ",{"type":62,"tag":212,"props":746,"children":748},{"className":747},[],[749],{"type":68,"value":750},"lineno",{"type":62,"tag":418,"props":752,"children":753},{},[754,760,761],{"type":62,"tag":212,"props":755,"children":757},{"className":756},[],[758],{"type":68,"value":759},"column",{"type":68,"value":744},{"type":62,"tag":212,"props":762,"children":764},{"className":763},[],[765],{"type":68,"value":766},"colno",{"type":62,"tag":418,"props":768,"children":769},{},[770],{"type":62,"tag":212,"props":771,"children":773},{"className":772},[],[774],{"type":68,"value":775},"function",{"type":62,"tag":418,"props":777,"children":778},{},[779,784],{"type":62,"tag":212,"props":780,"children":782},{"className":781},[],[783],{"type":68,"value":410},{"type":68,"value":785}," (or platform-equivalent symbol-set ref)",{"type":62,"tag":418,"props":787,"children":788},{},[789,791,797,799],{"type":68,"value":790},"any ",{"type":62,"tag":212,"props":792,"children":794},{"className":793},[],[795],{"type":68,"value":796},"resolve_failure",{"type":68,"value":798},", especially ",{"type":62,"tag":212,"props":800,"children":802},{"className":801},[],[803],{"type":68,"value":657},{"type":62,"tag":71,"props":805,"children":806},{},[807,809,814,816,821,823,828],{"type":68,"value":808},"The frame ",{"type":62,"tag":212,"props":810,"children":812},{"className":811},[],[813],{"type":68,"value":734},{"type":68,"value":815}," should match the deployed binary URL. 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Use when the user asks about top spenders, expensive users, per-user LLM cost, user-level cost drivers, or patterns behind high AI observability spend.\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1052,1054,1057,1058],{"name":1053,"slug":40,"type":15},"Analytics",{"name":1055,"slug":1056,"type":15},"Cost Optimization","cost-optimization",{"name":13,"slug":14,"type":15},{"name":9,"slug":8,"type":15},"2026-07-28T05:34:11.117757",{"slug":1061,"name":1061,"fn":1062,"description":1063,"org":1064,"tags":1065,"stars":32,"repoUrl":33,"updatedAt":1071},"auditing-endpoints","audit PostHog project endpoints","Audit every endpoint in a PostHog project for staleness, failed materialisations, and unused materialised versions. Use when the user asks \"what endpoints can I clean up?\", \"are any of my endpoints broken?\", \"which materialised versions are still being called?\", or wants a one-shot cleanup pass over the Endpoints product. Produces a prioritised report grouped by issue type, with recommended actions but does not modify anything without explicit confirmation.\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1066,1067,1070],{"name":1053,"slug":40,"type":15},{"name":1068,"slug":1069,"type":15},"Audit","audit",{"name":9,"slug":8,"type":15},"2026-06-08T08:08:33.693989",{"slug":1073,"name":1073,"fn":1074,"description":1075,"org":1076,"tags":1077,"stars":32,"repoUrl":33,"updatedAt":1083},"auditing-warehouse-source-health","audit PostHog data warehouse source health","Audit the health of a PostHog project's data warehouse sources and syncs — find every broken or degraded source connection, sync schema, and webhook channel. Use when the user asks \"why are my imports failing?\", \"what's broken with my sources?\", \"why is my warehouse data stale?\", or wants a one-shot triage of source\u002Fsync health before deciding where to dig in. Produces a prioritized report grouped by severity, with recommended next steps. For materialized-view health use `auditing-warehouse-view-health`; for a single failing sync use `diagnosing-failed-warehouse-syncs`.\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1078,1079,1081,1082],{"name":1068,"slug":1069,"type":15},{"name":1080,"slug":42,"type":15},"Data Warehouse",{"name":13,"slug":14,"type":15},{"name":9,"slug":8,"type":15},"2026-06-18T08:22:57.67984",{"slug":1085,"name":1085,"fn":1086,"description":1087,"org":1088,"tags":1089,"stars":32,"repoUrl":33,"updatedAt":1096},"auditing-warehouse-view-health","audit PostHog materialized view health","Audit the health of a PostHog project's materialized views (saved queries) — find every failed materialization and flag unused or stale materialized views that cost storage and compute. Use when the user asks \"which of my views are broken?\", \"why is this materialized view failing?\", \"are any of my views wasting compute?\", or wants a one-shot triage of view health. For source\u002Fsync health use `auditing-warehouse-source-health`.\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1090,1091,1092,1095],{"name":1068,"slug":1069,"type":15},{"name":1080,"slug":42,"type":15},{"name":1093,"slug":1094,"type":15},"Performance","performance",{"name":9,"slug":8,"type":15},"2026-06-18T08:25:10.936787",{"slug":1098,"name":1098,"fn":1099,"description":1100,"org":1101,"tags":1102,"stars":32,"repoUrl":33,"updatedAt":1109},"authoring-error-tracking-alerts","author PostHog error tracking alerts","Author error tracking alerts that fire when an issue is created, reopened, or starts spiking. Use when the user asks to set up error notifications, route exceptions to Slack\u002Fwebhook\u002FLinear, or evaluate which error events are worth alerting on. Covers trigger-event selection, integration choice, dedup against existing alerts, and shipping with the canonical message body shape.\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1103,1106,1107,1108],{"name":1104,"slug":1105,"type":15},"Alerting","alerting",{"name":30,"slug":31,"type":15},{"name":13,"slug":14,"type":15},{"name":9,"slug":8,"type":15},"2026-06-18T08:24:40.318583",{"slug":1111,"name":1111,"fn":1112,"description":1113,"org":1114,"tags":1115,"stars":32,"repoUrl":33,"updatedAt":1125},"authoring-log-alerts","author log alerts in PostHog","Author useful, low-noise log alerts on services in a PostHog project. Use when the user asks to set up alerts for their logs, suggest alerts they should add, or evaluate whether a service is worth monitoring. Covers service triage, baseline characterisation, threshold drafting, back-testing via simulate, and shipping with a notification destination.\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1116,1117,1120,1121,1124],{"name":1053,"slug":40,"type":15},{"name":1118,"slug":1119,"type":15},"Monitoring","monitoring",{"name":13,"slug":14,"type":15},{"name":1122,"slug":1123,"type":15},"Operations","operations",{"name":9,"slug":8,"type":15},"2026-07-18T05:10:54.430898",{"slug":1127,"name":1127,"fn":1128,"description":1129,"org":1130,"tags":1131,"stars":32,"repoUrl":33,"updatedAt":1142},"building-workflows","build and edit PostHog workflows","Build, edit, test, enable, and monitor PostHog workflows over MCP. Author the action\u002Fedge graph so it runs and opens cleanly in the visual editor, then change drafts surgically with patch operations. Use when asked to build, set up, automate, change, fix, or debug a workflow, campaign, broadcast, drip sequence, or event-triggered automation in the workflows product.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1132,1135,1138,1139],{"name":1133,"slug":1134,"type":15},"Automation","automation",{"name":1136,"slug":1137,"type":15},"MCP","mcp",{"name":9,"slug":8,"type":15},{"name":1140,"slug":1141,"type":15},"Workflow Automation","workflow-automation","2026-07-28T05:34:12.167015",61,{"items":1145,"total":1262},[1146,1153,1159,1166,1173,1180,1188,1195,1209,1224,1234,1252],{"slug":1047,"name":1047,"fn":1048,"description":1049,"org":1147,"tags":1148,"stars":32,"repoUrl":33,"updatedAt":1059},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1149,1150,1151,1152],{"name":1053,"slug":40,"type":15},{"name":1055,"slug":1056,"type":15},{"name":13,"slug":14,"type":15},{"name":9,"slug":8,"type":15},{"slug":1061,"name":1061,"fn":1062,"description":1063,"org":1154,"tags":1155,"stars":32,"repoUrl":33,"updatedAt":1071},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1156,1157,1158],{"name":1053,"slug":40,"type":15},{"name":1068,"slug":1069,"type":15},{"name":9,"slug":8,"type":15},{"slug":1073,"name":1073,"fn":1074,"description":1075,"org":1160,"tags":1161,"stars":32,"repoUrl":33,"updatedAt":1083},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1162,1163,1164,1165],{"name":1068,"slug":1069,"type":15},{"name":1080,"slug":42,"type":15},{"name":13,"slug":14,"type":15},{"name":9,"slug":8,"type":15},{"slug":1085,"name":1085,"fn":1086,"description":1087,"org":1167,"tags":1168,"stars":32,"repoUrl":33,"updatedAt":1096},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1169,1170,1171,1172],{"name":1068,"slug":1069,"type":15},{"name":1080,"slug":42,"type":15},{"name":1093,"slug":1094,"type":15},{"name":9,"slug":8,"type":15},{"slug":1098,"name":1098,"fn":1099,"description":1100,"org":1174,"tags":1175,"stars":32,"repoUrl":33,"updatedAt":1109},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1176,1177,1178,1179],{"name":1104,"slug":1105,"type":15},{"name":30,"slug":31,"type":15},{"name":13,"slug":14,"type":15},{"name":9,"slug":8,"type":15},{"slug":1111,"name":1111,"fn":1112,"description":1113,"org":1181,"tags":1182,"stars":32,"repoUrl":33,"updatedAt":1125},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1183,1184,1185,1186,1187],{"name":1053,"slug":40,"type":15},{"name":1118,"slug":1119,"type":15},{"name":13,"slug":14,"type":15},{"name":1122,"slug":1123,"type":15},{"name":9,"slug":8,"type":15},{"slug":1127,"name":1127,"fn":1128,"description":1129,"org":1189,"tags":1190,"stars":32,"repoUrl":33,"updatedAt":1142},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1191,1192,1193,1194],{"name":1133,"slug":1134,"type":15},{"name":1136,"slug":1137,"type":15},{"name":9,"slug":8,"type":15},{"name":1140,"slug":1141,"type":15},{"slug":1196,"name":1196,"fn":1197,"description":1198,"org":1199,"tags":1200,"stars":32,"repoUrl":33,"updatedAt":1208},"check-posthog-loading","inspect PostHog SDK loading across URLs","Inspect how the PostHog JavaScript SDK is loaded across a list of URLs. Use to confirm consistent installation across pages, find pages missing the snippet, detect mismatched API keys or hosts between pages, and verify the load method (head snippet vs deferred vs array.js).\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1201,1202,1203,1206,1207],{"name":1053,"slug":40,"type":15},{"name":30,"slug":31,"type":15},{"name":1204,"slug":1205,"type":15},"Frontend","frontend",{"name":13,"slug":14,"type":15},{"name":9,"slug":8,"type":15},"2026-05-07T05:56:19.828048",{"slug":1210,"name":1210,"fn":1211,"description":1212,"org":1213,"tags":1214,"stars":32,"repoUrl":33,"updatedAt":1223},"consuming-endpoints-from-client-code","integrate PostHog endpoints into client applications","Wire a PostHog endpoint into a client app or SDK. Covers fetching the OpenAPI spec, generating a typed client with openapi-generator or @hey-api\u002Fopenapi-ts, sending the right auth header, shaping the variables payload (HogQL code_name vs insight breakdown property), handling rate-limit and materialised-endpoint error responses. Use when the user says \"how do I call my endpoint\", \"generate a client for this\", or \"what auth header do I use\".\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1215,1218,1219,1220],{"name":1216,"slug":1217,"type":15},"API Development","api-development",{"name":1204,"slug":1205,"type":15},{"name":9,"slug":8,"type":15},{"name":1221,"slug":1222,"type":15},"SDK","sdk","2026-06-08T08:08:34.929454",{"slug":1225,"name":1225,"fn":1226,"description":1227,"org":1228,"tags":1229,"stars":32,"repoUrl":33,"updatedAt":1233},"copying-endpoints-across-projects","copy PostHog endpoints across projects","Copy a PostHog endpoint (a saved HogQL\u002Finsight query exposed as an API route) to another project in the same organization, or duplicate it under a new name in the same project. Use when the user wants to duplicate an endpoint, promote an endpoint from staging to production, replicate an endpoint's query\u002Fvariables\u002Ffreshness config in another workspace, or clone an endpoint to iterate on it. Unlike feature flags and experiments, endpoints have NO native cross-project copy tool — this skill covers the read-then-recreate flow (endpoint-get then endpoint-create), the active-project switching it requires, name-collision checks, and the safe defaults (land unmaterialised in the target, verify with endpoint-run). Does not cover editing endpoint versions (see managing-endpoint-versions) or authoring a brand-new endpoint from scratch (see creating-an-endpoint).\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1230,1231,1232],{"name":1216,"slug":1217,"type":15},{"name":1122,"slug":1123,"type":15},{"name":9,"slug":8,"type":15},"2026-07-15T05:29:58.442727",{"slug":1235,"name":1235,"fn":1236,"description":1237,"org":1238,"tags":1239,"stars":32,"repoUrl":33,"updatedAt":1251},"creating-ai-subscription","schedule recurring AI-generated PostHog reports","Create a recurring AI-generated PostHog report — schedule a free-text prompt to run on a cron, with the LLM-synthesized markdown delivered to email or Slack on each tick. Use when the user wants a recurring AI summary of X on any cadence (daily, weekly, monthly, yearly) rather than a one-off report. (To attach an AI summary to an existing insight\u002Fdashboard subscription instead of a free-text prompt, see `managing-subscriptions` and its `summary_enabled` option.)\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1240,1241,1244,1245,1248],{"name":1133,"slug":1134,"type":15},{"name":1242,"slug":1243,"type":15},"Email","email",{"name":9,"slug":8,"type":15},{"name":1246,"slug":1247,"type":15},"Reporting","reporting",{"name":1249,"slug":1250,"type":15},"Slack","slack","2026-06-09T07:32:27.935712",{"slug":1253,"name":1253,"fn":1254,"description":1255,"org":1256,"tags":1257,"stars":32,"repoUrl":33,"updatedAt":1261},"creating-an-endpoint","create PostHog API endpoints","Create a PostHog endpoint with the right shape on the first try — covers query kind choice, name conventions, what to expose as variables (HogQL code_name vs insight breakdown), data_freshness_seconds, and whether to materialise on day one. Use when the user says \"create an endpoint\", \"expose this query as an API\", \"turn this insight into an endpoint\", or asks for help structuring a new endpoint. Steers away from common mistakes: materialising a query with cohort breakdowns or compare mode, inline-only variables on a materialised endpoint, unbounded date ranges, ambiguous names.\n",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1258,1259,1260],{"name":1053,"slug":40,"type":15},{"name":1216,"slug":1217,"type":15},{"name":9,"slug":8,"type":15},"2026-06-08T08:08:29.624498",231]