slack

slack is a skill for Claude Code, Codex from XAIHT/Tlamatini. It costs 17 tokens per session (611 once invoked), scanned A, original, MIT.

A guide for working with Slack’s web interface, including sending messages, reading channel history, and managing threads.

In plain words
What is it for?
Use it to post messages, reply in threads, read conversations, add reactions, and upload files.
Why use it?
It maps common communication tasks to the appropriate Slack API requests and required authentication.

Skill for Claude CodeCodex

Which agent this was written for is unclear — built for openclaw. Also seen: built for openclaw.

Needs its repository: it reads a path above its own folder, which exists only inside the repository. The line is Current release: **[v1.90.0](../../../../docs/changes/2026-10-22-v1.90.0.md)**. Dated records below retain their original evidence dates..

Good fit Use it to post messages, reply in threads, read conversations, add reactions, and upload files.

Compare 6 skills from other repositories ↓
Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo
git clone --depth 1 https://github.com/XAIHT/Tlamatini
agentmods
npx agentmods add skills/xaiht/tlamatini/slack

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for slack

README.md
[![agentmods](https://agentmods.dev/badge/skills/xaiht/tlamatini/slack/github.svg)](https://agentmods.dev/skills/xaiht/tlamatini/slack)
Your own site
<a href="https://agentmods.dev/skills/xaiht/tlamatini/slack"><img src="https://agentmods.dev/badge/skills/xaiht/tlamatini/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.

agentmods 80×15 button for slack

Your own site · 80×15
<a href="https://agentmods.dev/skills/xaiht/tlamatini/slack"><img src="https://agentmods.dev/badge/skills/xaiht/tlamatini/slack.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 17 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 611 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00017 $0.00611
Opus 5.5 $0.00007 $0.00244
Sonnet 5.5 $0.00003 $0.00122
Haiku 4.5 $0.00002 $0.00061

Measured today against content hash 4bbb097130f1, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

slack scanned grade A with 0 findings 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 today.

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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Tlamatini/agent/skills_pkg/slack/SKILL.md · 61 lines

What it actually says

Slack skill

Current release: v1.90.0. Dated records below retain their original evidence dates.

HEADLESS IS FORBIDDEN. VISIBLE FOREGROUND EXECUTION ONLY. Every command, automated test, diagnostic, script, build, agent and browser must run in a visible foreground window on Angela's real desktop. Use forked CMD/PowerShell windows, execute_forked_window: true, and headless: false. Monitor live; if visibility cannot be confirmed, do not run. Read the mandatory execution policy.

Use the Slack Web API. SLACK_BOT_TOKEN must be in env.

Endpoints

  • post → chat.postMessage
  • reply → chat.postMessage with thread_ts
  • read-history → conversations.history
  • react → reactions.add
  • upload → files.upload (or files.uploadV2 for >5MB)

Endpoints are at https://slack.com/api/<method>. Token goes in Authorization: Bearer .... Body is application/json for most modern methods.

Changes

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.

  1. today Changed 4bbb097130f1
  2. 2d ago Changed d1b50291f0a7
  3. 3d ago Changed e7cc2e06f5c0
  4. 5d ago Changed · +3 lines 1804b3080f64
  5. 29d ago Changed · +2 lines 59a783be6343
  6. 1mo ago First seen · 56 lines · 17 tokens per session scan A 5ca3bdb4f1d2

Subscribe to this mod's changes

slack is a skill published in the GitHub repository XAIHT/Tlamatini (15 stars, last pushed yesterday), licensed MIT. It adds 17 tokens to every session and 611 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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