feat(pr-digest): reusable workflow for AI-curated PR Slack digest#293
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A new reusable workflow that posts a daily Slack digest of open pull requests in the calling repository. Designed for high-volume repos (100+ open PRs) — uses Claude to surface a focused triage view (today's focus, critical PRs, area summary) instead of a flat list. Falls back to deterministic oldest-first surfacing if the AI step fails or is disabled. Includes README and workflow-guide entries with caller examples for both high-volume (AI on) and low-volume (flat list) usage.
gabrielanhaia
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sudheer-monta
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a team
joscdk
approved these changes
May 29, 2026
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Pull request overview
Adds a new reusable workflow .github/workflows/pr-digest.yml that posts a daily Slack digest of open PRs for a calling repository, with optional Claude-powered curation, deterministic fallback, and an in-thread per-area breakdown. README and the workflow guide are updated with usage examples and a full reference.
Changes:
- New reusable
workflow_callworkflow that fetches open PRs viagh, enriches/buckets them withjq, optionally calls Anthropic for headline + focus selection, and posts a Slack Block Kit message (plus optional thread reply) viachat.postMessage. - README entry and a new "PR Digest" section in
docs/workflow-guide.mdwith inputs, secrets, behaviour notes, and two example caller workflows.
Reviewed changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.
| File | Description |
|---|---|
.github/workflows/pr-digest.yml |
New reusable workflow implementing PR fetch, filtering, AI curation, Slack message build, and threaded breakdown post. |
README.md |
Lists the new workflow and adds two caller examples plus prerequisites. |
docs/workflow-guide.md |
Adds a full PR Digest reference section (inputs, secrets, permissions, behaviour, examples, manual testing). |
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pedromassango
approved these changes
May 29, 2026
- Fix --slurpfile crash when AI step is skipped: write empty fallback
/tmp/ai.json before the build-step jq invocation. Previously, with
use-ai-curation=false or missing ANTHROPIC_API_KEY, the build step
would abort with 'Could not open file /tmp/ai.json'.
- Switch runs-on from ubuntu-latest to linux-arm64 to match the
established convention across deploy-*.yml, pull-request*.yml,
semgrep-security-scan.yml, etc.
- Default model: claude-sonnet-4-7 -> claude-sonnet-4-6. The 4-7 ID
is not a valid Sonnet alias on the Anthropic API (it's an Opus
identifier); the default would have 404'd and silently fallen
back to deterministic curation every run.
- Slack title escaping: replace gsub('[<>&]'; ' ') with HTML-entity
escaping ('&', '<', '>'). Stripping mangled legitimate
characters in titles like 'Bump foo from <2.0 to >=2.1'.
- Docs: clarify that pr-digest.yml only supports workflow_call;
manual testing happens via the caller workflow which declares
workflow_dispatch itself.
Member
Author
|
Thanks @copilot — all five points are valid. Addressed in
Resolving the threads. |
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What?
Adds a new reusable workflow at
.github/workflows/pr-digest.ymlthat any Monta repo can call to post a daily Slack digest of its open pull requests. UpdatesREADME.mdanddocs/workflow-guide.mdwith usage examples.The message is AI-curated by default: a compact JSON of open-PR metadata is sent to Claude, which produces a 1–2 sentence headline plus up to N focus PRs with one-line "why this matters" notes. The deterministic Block Kit builder then renders the full Slack message — header counts, AI headline, today's focus, critical PRs, area summary, deep links. A threaded reply carries the full per-area breakdown so the channel stays scannable at high volume.
Caller-tunable via inputs:
slack-channel-id,stale-threshold-days(2),critical-threshold-days(7),max-prs-to-surface(5),use-ai-curation(true),model(claude-sonnet-4-7),post-thread-breakdown(true),empty-state(silent),include-drafts(false),exclude-authors,title.Secrets:
SLACK_APP_TOKEN(existing org/repo secret used by ~20 deploy workflows) andANTHROPIC_API_KEY(only when AI curation is enabled — falls back gracefully if missing or the call fails).Why?
Built for high-volume repos like
monorepo-typescript(100+ open PRs). A flat list of every open PR is unreadable and hits Slack's 50-block ceiling; a smart curated view ("here are the 5 things to act on today, by area") is the only thing that scales. Designed to be reusable so any other repo can adopt the same digest with a ~20-line caller workflow.Complements the existing
automation-stale-prs.ymlhousekeeper (which closes PRs after 14 days of inactivity) by surfacing them to the team early.Context
Consumer workflow lands in parallel: https://github.com/monta-app/monorepo-typescript/pull/new/feat/NOJIRA/pr-digest
That PR must wait for this one to merge — it references
monta-app/github-workflows/.github/workflows/pr-digest.yml@main.