Borrowing it
Nothing to install: this file belongs to DingyangLyu/MatClaw. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/DingyangLyu/MatClaw/main/.claude/skills/add-slack/SKILL.mdgit clone --depth 1 https://github.com/DingyangLyu/MatClawWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/dingyanglyu/matclaw/add-slack)<a href="https://agentmods.dev/skills/dingyanglyu/matclaw/add-slack"><img src="https://agentmods.dev/badge/skills/dingyanglyu/matclaw/add-slack/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/dingyanglyu/matclaw/add-slack"><img src="https://agentmods.dev/badge/skills/dingyanglyu/matclaw/add-slack.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00029 | $0.01992 |
| Opus 5.5 | $0.00012 | $0.00797 |
| Sonnet 5.5 | $0.00006 | $0.00398 |
| Haiku 4.5 | $0.00003 | $0.00199 |
Grade A, and why
add-slack scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
- Via API: `curl -s -H "Authorization: Bearer $SLACK_BOT_TOKEN" "https://slack.com/api/conversations.list" | jq '.channels[] | {id, name}'` Copies of this mod
6 near-identical copies found in the catalogue:
How it starts
The opening of the file, as written. The whole thing — 216 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Add Slack Channel
This skill adds Slack support to MatClaw using the skills engine for deterministic code changes, then walks through interactive setup.
Phase 1: Pre-flight
Check if already applied
Read .matclaw/state.yaml. If slack is in applied_skills, skip to Phase 3 (Setup). The code changes are already in place.
Ask the user
Do they already have a Slack app configured? If yes, collect the Bot Token and App Token now. If no, we'll create one in Phase 3.
Phase 2: Apply Code Changes
Run the skills engine to apply this skill's code package. The package files are in this directory alongside this SKILL.md.
Initialize skills system (if needed)
If .matclaw/ directory doesn't exist yet:
npx tsx scripts/apply-skill.ts --init
Or call initSkillsSystem() from skills-engine/migrate.ts.
Apply the skill
npx tsx scripts/apply-skill.ts .claude/skills/add-slack
This deterministically:
- Adds
src/channels/slack.ts(SlackChannel class with self-registration viaregisterChannel) - Adds
src/channels/slack.test.ts(46 unit tests) - Appends
import './slack.js'to the channel barrel filesrc/channels/index.ts - Installs the
@slack/boltnpm dependency - Records the application in
.matclaw/state.yaml
If the apply reports merge conflicts, read the intent file:
modify/src/channels/index.ts.intent.md— what changed and invariants
Validate code changes
npm test
npm run build
All tests must pass (including the new slack tests) and build must be clean before proceeding.
Phase 3: Setup
Create Slack App (if needed)
If the user doesn't have a Slack app, share SLACK_SETUP.md which has step-by-step instructions with screenshots guidance, troubleshooting, and a token reference table.
Quick summary of what's needed:
- Create a Slack app at api.slack.com/apps
- Enable Socket Mode and generate an App-Level Token (
xapp-...) - Subscribe to bot events:
message.channels,message.groups,message.im - Add OAuth scopes:
chat:write,channels:history,groups:history,im:history,channels:read,groups:read,users:read - Install to workspace and copy the Bot Token (
xoxb-...)
What ships with it
7 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 216 lines · 29 tokens per session scan A 0576807072e6
add-slack is a skill published in the GitHub repository DingyangLyu/MatClaw (98 stars, last pushed 6mo ago), licensed Apache-2.0. It adds 29 tokens to every session and 1,992 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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