docs: Prompt labels

[jurajmajerik]

Changes

Documents prompt labels for prompt management (PostHog/posthog#70862, PostHog/posthog#71509):

• New Labels section: what a label is (a movable pointer to exactly one version), releasing and rolling back by moving the label, naming rules, the API and MCP ways to manage labels, and how fast label moves propagate (seconds on the API, SDK cache TTL on top)
• SDK examples in Python and JS now show label: 'production' as the recommended pattern for production apps, ahead of version pinning
• MCP tools table updated with prompt-label-set and prompt-label-delete
• Caching section explains latest, pinned-version, and labeled fetches cache independently
• Self-hosted note: older servers ignore the label parameter and the SDKs log a warning

Draft until the SDK releases ship (posthog-python#744, posthog-js#4163) — the examples use SDK options that aren't published yet.

[github-actions]

Deploy preview

Status	Details	Updated (UTC)
🟢 Ready	View preview	Jul 21, 2026 12:53PM

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Vale prose linter → found 6 errors, 4 warnings, 0 suggestions in your markdown

Full report → Copy the linter results into an LLM to batch-fix issues.

Linter being weird? Update the rules!

contents/docs/prompt-management/index.mdx — 6 errors, 4 warnings, 0 suggestions

Line	Severity	Message	Rule
9:177	error	Hi, Andy here... use an en dash ( – ) with spaces. On Mac, holding down the Option and hyphen key will give you an en dash.	PostHogBase.EnDash
32:24	warning	Use 'Markdown' instead of 'markdown'.	Vale.Terms
32:132	warning	Use 'Markdown' instead of 'markdown'.	Vale.Terms
32:161	warning	Use 'Markdown' instead of 'markdown'.	Vale.Terms
55:66	warning	Capitalize 'Workflows' for PostHog's product. Use 'workflows' for the general industry concept.	PostHogBase.ProductNames
83:22	error	Hi, Andy here... use an en dash ( – ) with spaces. On Mac, holding down the Option and hyphen key will give you an en dash.	PostHogBase.EnDash
88:137	error	Hi, Andy here... use an en dash ( – ) with spaces. On Mac, holding down the Option and hyphen key will give you an en dash.	PostHogBase.EnDash
93:26	error	Hi, Andy here... use an en dash ( – ) with spaces. On Mac, holding down the Option and hyphen key will give you an en dash.	PostHogBase.EnDash
322:1	error	Hi, Andy here... use an en dash ( – ) with spaces. On Mac, holding down the Option and hyphen key will give you an en dash.	PostHogBase.EnDash
323:1	error	Hi, Andy here... use an en dash ( – ) with spaces. On Mac, holding down the Option and hyphen key will give you an en dash.	PostHogBase.EnDash

[github-actions]

Bundle report

Total JS (gzip)

6.72 MiB (+0.2 KiB / +0.0%)

Eager graph (modules shipped in each entrypoint's initial chunks)

Entrypoint	Eager size	Budget	Modules
✅ app	16.06 MiB (+2.8 KiB / +0.0%)	report-only	1968

Largest modules in the app closure

Module	Size
./src/data/mcp-tools.json	861.3 KiB
css ./node_modules/.pnpm/css-loader@5.2.7_webpack@5.101.3/node_modules/css-loader/dist/cjs.js??ruleSet[1].rules[8].oneOf[1].use[1]!./node_modules/.pnpm/postcss-loader@4.3.0_postcss@8.5.6_webpack@5.101.3/node_modules/postcss-loader/dist/cjs.js??ruleSet[1].rules[8].oneOf[1].use[2]!./src/styles/global.css	740.2 KiB
./src/components/Stickers/Stickers.tsx	696.4 KiB
./node_modules/.pnpm/@radix-ui+react-icons@1.3.2_react@18.3.1/node_modules/@radix-ui/react-icons/dist/react-icons.esm.js	481.4 KiB
./node_modules/.pnpm/rehype-raw@7.0.0/node_modules/rehype-raw/lib/index.js + 29 modules	395.1 KiB
./node_modules/.pnpm/@posthog+icons@0.36.6_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/@posthog/icons/dist/posthog-icons.cjs.js	364.8 KiB
./src/hooks/useCustomers.tsx + 54 modules	355.1 KiB
./node_modules/.pnpm/@posthog+icons@0.36.6_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/@posthog/icons/dist/posthog-icons.es.js	354.8 KiB
./node_modules/.pnpm/react-markdown@8.0.7_@types+react@16.14.66_react@18.3.1/node_modules/react-markdown/lib/react-markdown.js + 88 modules	351.4 KiB
./node_modules/.pnpm/cloudinary-core@2.14.0_lodash@4.17.21/node_modules/cloudinary-core/cloudinary-core.js	281.9 KiB
./src/components/ProductComparisonTable/index.tsx + 120 modules	278.6 KiB
./src/components/SearchUI/index.tsx + 87 modules	271.9 KiB
./node_modules/.pnpm/d3@7.9.0/node_modules/d3/src/index.js + 208 modules	247.4 KiB
./src/components/Pricing/PricingSlider/Slider.tsx + 87 modules	239.9 KiB
./gatsby-browser.tsx + 44 modules	227.0 KiB

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Eager-graph budgets are report-only until a baseline is established. Sizes are gzip of public/**/*.js; eager size is webpack module source bytes for the modules actually shipped in the entrypoint's initial chunks (post-tree-shake).