synthesis-slack-sync SKILL.md skillA
synthesis-slack-sync from synthesisengineering/synthesis-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add synthesisengineering/synthesis-skills/synthesis-slack-sync@v4.0.3Pins v4.0.3 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- synthesisengineering/synthesis-skills
- Path
skills/synthesis-slack-sync/SKILL.md- Versions recorded
- 15
- Latest version
- v4.0.3, committed Nov 3, 2026
- First version recorded
- Aug 28, 2026
- Size
- 7,992 bytes
- Repository stars
- 23
- License
- Apache-2.0
Sync Slack channels, DMs and threads to local transcripts via Slack MCP and update the daily action plan, with full thread re-reads and watermarked windows. Use when asked to: slack sync, sync from slack, check slack, read channels, sync messages, sync transcripts, what's new on slack.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Synthesis Slack Sync
A protocol for syncing Slack channels and threads to local transcript files using Slack MCP. Designed for AI-assisted workflows where an agent reads Slack on behalf of a user, saves transcripts locally, and updates a daily action plan.
## Binding rules
1. **Transcripts first.** Lookups and verification ("did X get sent?", "did anyone reply?") `Grep` local transcripts, never the Slack search API; the question shape is the trigger.
2. **A zero-result search is NEVER evidence of absence.** Prove absence with a bounded direct read and state its bounds; re-run a modifier query without the modifier before trusting a zero.
3. **Preflight decides the targets.** Steps 1, 3 and 3b read only its resolved-target list; taking an id such as `dm_id` from the config mid-sweep is banned.
4. **Windows are printed, never typed:** `WINDOW_OLDEST` comes from `sync_watermark.py window`. Every declared target is read every sync.
5. **Re-read every active thread** (today, yesterday, Step 1 indicators) in full; replies, the user's own included, never appear at channel level.
…Read the whole file at its exact version.
How to install
mdr add synthesisengineering/synthesis-skills/synthesis-slack-sync@sha256:98b0f8876b76424aThe line at the top of this page pins the label v4.0.3, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_ji5cvpqgnovrgddn)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 15 versions of this file, between Aug 28, 2026 and Nov 3, 2026, about one every 5 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v4.0.3 latest | 2026-11-03 | ea37b5a | 7,992 B | A | view · diff |
| v4.0.2 | 2026-10-26 | 9f9ffef | 7,992 B | A | view · diff |
| v4.0.1 | 2026-10-22 | 6459358 | 7,992 B | A | view · diff |
| v4.0.0 | 2026-10-06 | 0a99aa0 | 7,992 B | A | view · diff |
| v4.0.0 | 2026-10-06 | 6aa3c4e | 7,614 B | A | view · diff |
| v3.14.0 | 2026-10-02 | eee0e73 | 32,542 B | A | view · diff |
| v3.14.0 | 2026-10-02 | 55621a3 | 32,463 B | A | view · diff |
| v3.13.0 | 2026-09-28 | e1b2279 | 32,252 B | A | view · diff |
| v3.12.0 | 2026-09-27 | 95144f1 | 31,814 B | A | view · diff |
| v3.11.0 | 2026-09-23 | 7b39cfd | 30,930 B | A | view · diff |
| v3.10.0 | 2026-09-02 | 53e146b | 30,120 B | A | view · diff |
| v3.9.0 | 2026-09-02 | 977d233 | 29,497 B | A | view · diff |
| v3.8.0 | 2026-09-01 | d12b919 | 49,840 B | A | view · diff |
| v3.7.0 | 2026-08-29 | 14452c9 | 47,083 B | A | view · diff |
| v3.5.0 | 2026-08-28 | 6104136 | 45,024 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (7992 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
synthesisengineering/synthesis-skills · 23 stars · license Apache-2.0 · pushed 2026-11-05 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_ji5cvpqgnovrgddn GET https://markdownregistry.com/api/v1/resolve?ref=synthesisengineering/synthesis-skills/synthesis-slack-sync GET https://markdownregistry.com/api/v1/blob/98b0f8876b76424a4b47731ffc6ef5deff47be5a0210e65d1bc86898d4353a2e
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.