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feat(workflows): expose read-only email sending readiness over mcp - #570

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feat(workflows): expose read-only email sending readiness over mcp#570
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email-sending-readiness

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@Silthus

@Silthus Silthus commented Oct 25, 2026 •
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Moved here from #116865, closed on 2026-10-25 so this fork stack is the only copy. It opens upstream again after review.

This revision

  • Restacked on master 43333f81da9 on 2026-10-31. The workflows tools.yaml keeps master's broadcast tools next to the two readiness tools, and the generated files are regenerated from the combined config.
  • The flag is now workflows-email-from-code, the one rollout flag for the Workflows email work. 3c0a6bcd8f moves master's agent setup flag onto it; feat(workflows): let agents set up an email sending domain via mcp #568 carries the same commit, so the two merge cleanly.
  • Review fixes, 2026-11-01: the workflows-email-reputation tool is gone. Master's workflows-reputation-get already reads the same endpoint, so two tools no longer give an agent conflicting guidance. The suspension tool and the auto-pause guide point at it.

Problem

  • An agent on the PostHog MCP cannot tell whether a project's workflow email is suspended: no tool reads the project's sending suspension.
  • integrations-list drops a sender's config.verified, so an agent cannot see whether a sender's domain is verified.

This recreates the fork draft Silthus#351 on current master. Its earlier upstream draft, PostHog#113058, is closed. It does not depend on #568, but both PRs gate their tools on the same workflows-email-from-code flag.

Impact

Pays into Grow Workflows through organizations that send workflow email: an agent can tell whether sending is suspended, and whether a sender is verified, before it sends. Not measured on its own. Expected move: small, up. Run cost: n/a.

Note

🔵 Merge risk: low · one-way door: public tool names can become client dependencies once the flag is on.

  • One read-only tool exposes an existing endpoint response. Backend project and object permissions stay authoritative.
  • The tool stays hidden until the default-off flag is on. integrations-list adds only config.verified to its response allowlist, for every caller.
  • Master gates its agent setup panel and the email status and verify tools on its own agent setup flag. After this merges they read workflows-email-from-code. Copy that flag's release conditions to the new one before the deploy.

Changes

  • With the flag on, agents get workflows-email-sending-suspension, which reads whether the project's workflow email is suspended, when, and why.
  • The tool requires hog_flow:read and is annotated read-only. Its description sends an agent to master's workflows-reputation-get for sending health and allowance, and says that missing data or an unavailable tool means unknown.
  • The suspension tool stays next to workflows-reputation-get, although that tool also returns the three suspension fields. workflows-reputation-get is behind workflows-sending-tier-requests, so with only workflows-email-from-code on, the suspension tool is the agent's only read of the suspension.
  • integrations-list now returns config.verified for each integration. Other raw configuration stays excluded.
  • Resuming sending stays unavailable to agents. workflows-get already shows a workflow's pause fields.
  • Mechanical: the flag rename across master's frontend, API, tool and test files, and regenerated tool handlers, definitions and schema snapshots.

No web app screen changes.

How did you test this code?

Test seam: the MCP catalog and tool calls at the API transport boundary, in services/mcp/tests/unit/workflows-sending-readiness.test.ts.

Test rationale:

  • The tools appear only with the flag on, and stay hidden with it off or unresolved. This fails if the gate drops.
  • The suspension call forwards to the existing endpoint and returns its fields. This fails if the tool reads the wrong route or filters the response.
  • integrations-list keeps config.verified as true or false and drops other config keys. No existing test read sender verification through the tool.

Lane gate on 96d8e9e687: the MCP typecheck, and the readiness and schema snapshot suites. hogli build:openapi produced no further changes.

CI on the fork: the depot jobs never get a runner, so the gates that depend on them fail. The lane gate stands in until the PR opens upstream.

Proofs per qa-swarm PROOF.md:

  • Live run: gap. No MCP session ran against a running stack.
  • Prod shape: gap, accepted by standing rule until 2026-11-02.
  • Post-deploy watch: owed after merge.

👉 Stay up-to-date with PostHog coding conventions for a smoother review.

Release status

  • This change is behind a feature flag and is not available to users

Docs update

Updated docs/internal/workflows-email-auto-pause.md with the read-only MCP inspection, which flag gates each tool, and what unknown data means.

🤖 Agent context

Autonomy: Human-driven (agent-assisted)

Agent: Claude Code, Claude Opus 5.5 (claude-opus-5-5)

  • Recreated from the fork draft feat(workflows): expose read-only email sending readiness #351, then restacked on master 43333f81da9: 6 conflicting files, 4 of them generated and regenerated.
  • Earlier review, two rounds, GPT-6.1 Sol (Codex, high) and a fresh Claude Opus 5.5: removed five fork test cases that only exercised generic MCP machinery this PR does not change.
  • CodeRabbit: not run; it is retired on this repository.
  • Skills: /implementing-mcp-tools, /writing-pr-descriptions, pr-description, modernize-pr, merge-risk.
  • No customer material went into this PR.

Decisions

Question Answer Who Where
Which flag gates the readiness tools? workflows-email-from-code, the one rollout flag for the Workflows email work 👤 Human map
Does the suspension tool stay next to workflows-reputation-get? Yes; it is the only suspension read when only workflows-email-from-code is on. Dropping it is the alternative 🤖 Agent pending approval
Does this PR keep its own reputation tool? No; master's workflows-reputation-get reads the same endpoint 🤖 Agent pending approval
Can an agent resume sending? No; the tools are read-only, and workflows-get already shows a workflow's pause fields 🤖 Agent pending approval

Involvement: no grilling rounds, no prototypes. GPT-6.1 Sol (high) reviewed the restack in round 1 (one finding, fixed). QA swarm on 2026-11-01: a full panel in round 2 (GPT-6.1 Sol review lanes, Claude Opus 5.5 fresh eyes; 2 fixed, 2 rejected) and a fresh-eyes round 3 on the fixes (this body refreshed; the suspension tool kept). Proof: command output; live run owed.

🤖 Generated with Claude Code

This was referenced Oct 25, 2026
Closed
Closed
Open
Silthus and others added 2 commits October 31, 2026 08:22
@Silthus @claude
feat(workflows): gate email agent setup on workflows-email-from-code
3c0a6bc 
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
@Silthus @claude
feat(workflows): expose read-only email sending readiness over mcp
50ec99b 
Add workflows-email-sending-suspension and workflows-email-reputation as
read-only MCP tools, and return config.verified from integrations-list,
all behind the workflows-email-from-code flag.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
@Silthus
Silthus force-pushed the email-sending-readiness branch from 9d7065d to 50ec99b Compare October 31, 2026 10:13
@github-actions

github-actions Bot commented Oct 31, 2026 •
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🤖 CI report

✅ Complexity (TypeScript) — clean

Cyclomatic complexity above the limit in changed typescript files (10 for production files, 15 for test files). Warn only: worth simplifying when you next touch these functions.

⚠️ Bundle size — 🔺 +3.0 KiB (+0.0%)

Uncompressed size of every built .js bundle, compared against the base branch.

Total: 75.14 MiB · 🔺 +3.0 KiB (+0.0%)

No file changed by more than 1000 B.

Posted automatically by build-bundle-size-report · uncompressed bytes from dist-report

✅ Eager graph — within budget

How much code each root ships on the eager path — downloaded and parsed before the surface is interactive. Measured from the esbuild output chunks (post-tree-shake, static imports only); lazy import() / React.lazy chunks are not counted.

Root Eager (shipped) Δ vs base Budget
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logged-out boot: index + App + bootApp (preloaded by every page, including /login)
src/index.tsx + src/scenes/App.tsx + src/scenes/bootApp.ts		 2.99 MiB · 622 files 🔺 +115 B (+0.0%) ██████████ 98.5% of 3.03 MiB
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92.5 KiB ../node_modules/.pnpm/prosemirror-view@1.40.1/node_modules/prosemirror-view/dist/index.js
Largest files eagerly shipped from src/scenes/web-analytics/WebAnalyticsScene.tsx
Size File
325.0 KiB ../node_modules/.pnpm/posthog-js@1.443.0_@types+react@18.3.27_react@18.3.1/node_modules/posthog-js/dist/module.mjs
286.4 KiB src/taxonomy/core-filter-definitions-by-group.json
239.9 KiB ../packages/quill/packages/quill/dist/index.js
217.5 KiB ../node_modules/.pnpm/@posthog+icons@0.39.0_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/@posthog/icons/dist/posthog-icons.es.js
187.9 KiB src/queries/validators.js
153.8 KiB ../node_modules/.pnpm/re2js@0.4.1/node_modules/re2js/build/index.esm.js
144.1 KiB ../packages/quill/packages/primitives/dist/index.js
126.8 KiB ../node_modules/.pnpm/react-dom@18.3.1_react@18.3.1/node_modules/react-dom/cjs/react-dom.production.min.js
102.9 KiB src/products.tsx
94.5 KiB ../node_modules/.pnpm/@tiptap+core@3.20.6_@tiptap+pm@3.20.6/node_modules/@tiptap/core/dist/index.js
Largest files eagerly shipped from src/scenes/session-recordings/detail/SessionRecordingDetail.tsx
Size File
325.0 KiB ../node_modules/.pnpm/posthog-js@1.443.0_@types+react@18.3.27_react@18.3.1/node_modules/posthog-js/dist/module.mjs
316.5 KiB ../node_modules/.pnpm/posthog-js@1.443.0_@types+react@18.3.27_react@18.3.1/node_modules/posthog-js/dist/rrweb.js
286.4 KiB src/taxonomy/core-filter-definitions-by-group.json
239.9 KiB ../packages/quill/packages/quill/dist/index.js
217.5 KiB ../node_modules/.pnpm/@posthog+icons@0.39.0_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/@posthog/icons/dist/posthog-icons.es.js
153.8 KiB ../node_modules/.pnpm/re2js@0.4.1/node_modules/re2js/build/index.esm.js
126.8 KiB ../node_modules/.pnpm/react-dom@18.3.1_react@18.3.1/node_modules/react-dom/cjs/react-dom.production.min.js
102.9 KiB src/products.tsx
94.5 KiB ../node_modules/.pnpm/@tiptap+core@3.20.6_@tiptap+pm@3.20.6/node_modules/@tiptap/core/dist/index.js
92.5 KiB ../node_modules/.pnpm/prosemirror-view@1.40.1/node_modules/prosemirror-view/dist/index.js

Posted automatically by check-eager-graph · sizes are eager output bytes (shipped, post-tree-shake) from the esbuild metafile · part of PostHog#32479

✅ Toolbar bundle — eager 2.33 MiB within budget

What the toolbar ships to customer pages, measured from the esbuild output (minified, post-tree-shake). The eager set is the entry plus everything statically imported from it — fetched before any feature runs; deferred chunks load lazily. The eager guardrail is 5.72 MiB. Each output file must also stay below 10 MB, where CloudFront stops compressing it. The module boundary is enforced separately by check-toolbar-graph.

Metric Size Δ vs base Budget
Eager (shipped)
entry + static imports		 2.33 MiB · 19 files 🔺 +115 B (+0.0%) ████░░░░░░ 40.8% of 5.72 MiB
Deferred (lazy) 2.11 MiB · 42 files no change n/a — loads on demand
Loader dist/toolbar.js 1.2 KiB no change █░░░░░░░░░ 6.0% of 19.5 KiB
Largest eagerly-shipped chunks
Size File
941.8 KiB dist/toolbar/toolbar-app-CNZCJTDY.css
695.8 KiB dist/toolbar/chunk-chunk-NUWPCNXY.js
261.2 KiB dist/toolbar/chunk-chunk-T5DKNJQU.js
131.8 KiB dist/toolbar/chunk-chunk-FDH2IBXT.js
130.4 KiB dist/toolbar/chunk-chunk-KDUJEIKP.js
75.7 KiB dist/toolbar/toolbar-app-TP2JYJFO.js
69.0 KiB dist/toolbar/chunk-chunk-TSAL54PB.js
33.8 KiB dist/toolbar/chunk-chunk-FR2SFTP5.js
21.7 KiB dist/toolbar/chunk-chunk-2P7IMPQ2.js
6.8 KiB dist/toolbar/chunk-chunk-DV7IWQNF.js

Posted automatically by check-toolbar-size · sizes are toolbar output bytes (shipped, post-tree-shake) from the esbuild metafile

✅ Dist folder size — 🔺 +25.8 KiB (+0.0%)

Total size of the built frontend/dist folder (all assets), compared against the base branch.

Total: 966.36 MiB · 🔺 +25.8 KiB (+0.0%)

ℹ️ MCP UI apps size — 35 app(s), 29120.9 KB JS

Built size of each MCP UI app (main.js + styles.css).

App JS CSS
debug 844.3 KB 211.6 KB
explain-chart 1117.7 KB 211.6 KB
action 767.7 KB 211.6 KB
action-list 835.3 KB 211.6 KB
cohort 766.7 KB 211.6 KB
cohort-list 834.3 KB 211.6 KB
email-template 766.6 KB 211.6 KB
error-details 771.6 KB 211.6 KB
error-issue 768.9 KB 211.6 KB
error-issue-list 836.8 KB 211.6 KB
experiment 832.4 KB 211.6 KB
experiment-list 836.1 KB 211.6 KB
experiment-results 834.3 KB 211.6 KB
feature-flag 834.7 KB 211.6 KB
feature-flag-list 838.4 KB 211.6 KB
feature-flag-testing 770.0 KB 211.6 KB
inline-scan 767.2 KB 211.6 KB
insight-actors 833.8 KB 211.6 KB
llm-costs 831.1 KB 211.6 KB
session-recording 769.0 KB 211.6 KB
survey 768.3 KB 211.6 KB
survey-global-stats 831.1 KB 211.6 KB
survey-list 836.0 KB 211.6 KB
survey-stats 831.1 KB 211.6 KB
trace-span 767.1 KB 211.6 KB
trace-span-list 835.2 KB 211.6 KB
vision-observation-list 834.4 KB 211.6 KB
workflow 767.1 KB 211.6 KB
workflow-list 834.7 KB 211.6 KB
workflow-setup-status 766.7 KB 211.6 KB
query-results 1089.6 KB 211.6 KB
render-ui 1193.6 KB 211.6 KB
visual-review-snapshots 771.6 KB 211.6 KB
workflow-data-suggestions 769.4 KB 211.6 KB
workflow-sending-rules 768.1 KB 211.6 KB
ℹ️ MCP agent API — agent-facing tool changes

What this PR changes for agents, from the tool schema snapshots and tool definitions.

Tools added (1): workflows-email-sending-suspension (33 chars)

Tools changed (3):

Tool Params Scopes Annotations Schema chars
integrations-email-status-retrieve +id +refresh n/a -> 298
integrations-email-verify-create +id n/a -> 142
integrations-list description changed
ℹ️ frontend-layers — no base comparison available

Static imports from a lower frontend layer into a higher one (layers, lowest first: kernel, shell, query, features). Compared with the base branch, so an import that a PR also adds to layer-baseline.txt still shows here. Sizes are the source bytes on the eager path of every logged-in page.

Layer Eager source bytes Δ vs base
kernel 4.06 MiB (no base measurement)
shell 2.98 MiB (no base measurement)
query 338.8 KiB (no base measurement)
features 2.91 MiB (no base measurement)

ℹ️ No base report, so new and removed imports are not listed.

Download the interactive layer graph for this PR.

Posted automatically by check-layers

@Silthus @claude
refactor(workflows): reuse workflows-reputation-get for sending health
96d8e9e 
Master already exposes GET hog_flows/reputation/ as workflows-reputation-get,
so the duplicate workflows-email-reputation tool is gone and the suspension
tool and the auto-pause guide point at it. The readiness test drops an
assertion on a tool name no config can produce.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
@Silthus Silthus mentioned this pull request Nov 2, 2026
Merged
@Silthus

Silthus commented Nov 2, 2026

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Moved to PostHog#127297.

@Silthus Silthus closed this Nov 2, 2026
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@Silthus