A Slack integration that lets a coding agent work with a Slack workspace through its web interface. Slack is a team messaging service used for channels, direct messages, files, and reactions.

Use it to send and read messages, search conversations, list channels and users, handle files, and manage reactions or pins.

It removes the need to switch tools or perform routine workspace actions manually from the Slack interface.

slack — Skill for Claude Code and Codex by mnlt/teleport

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add mnlt/teleport --skill slack

Clone the repo

git clone --depth 1 https://github.com/mnlt/teleport

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/mnlt/teleport/slack/github.svg)](https://agentmods.dev/skills/mnlt/teleport/slack)

Your own site

<a href="https://agentmods.dev/skills/mnlt/teleport/slack"><img src="https://agentmods.dev/badge/skills/mnlt/teleport/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/mnlt/teleport/slack"><img src="https://agentmods.dev/badge/skills/mnlt/teleport/slack.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 48 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,661 The whole file, excluding the scripts and references it only reads on demand.

Security scan B 2 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.

Model	Per session	Once invoked
Fable 5.1	$0.00048	$0.01661
Opus 5.5	$0.00019	$0.00664
Sonnet 5.5	$0.00010	$0.00332
Haiku 4.5	$0.00005	$0.00166

Measured 1mo ago against content hash cac7cbd1ee23, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

slack scanned grade B with 2 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 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.

Reads agent configuration directoriesmediumAgent snooping

.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.

**Do NOT suggest editing `~/.claude/settings.local.json` manually.** The `teleport-setup add-key` command handles it with backup, validation, and masked input. Stop execution until the user has run the command and restar

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -sL -X POST -H "Authorization: Bearer $SLACK_BOT_TOKEN" \

skills/slack/SKILL.md · 105 lines

How it starts

The opening of the file, as written. The whole thing — 105 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Slack

Operates Slack via its public Web API (https://slack.com/api/METHOD). Covers messaging, channels/DMs, users, files, search, reactions, and pins — no MCP server required.

Usage

Use for: Posting to channels, reading recent history, listing channels/members, searching messages, managing reactions/pins.
Skip for: Interactive back-and-forth (needs Events API / RTM), human approval flows, Enterprise Grid admin ops (SCIM / Admin API).

Credentials check

[ -n "${SLACK_BOT_TOKEN:-$SLACK_USER_TOKEN}" ] && echo "SLACK_TOKEN: PRESENT" || echo "SLACK_TOKEN: MISSING"

Never echo the variable directly — the value would appear in the conversation transcript. Use only the boolean pattern above.

If MISSING, respond to the user with EXACTLY this message (do NOT paraphrase, do NOT suggest manual JSON edits):

I need your slack credential. Run this in another terminal — it'll open the signup page, validate format, and save it safely with masked input:
teleport-setup add-key slack
Then restart Claude Code (/exit, then claude) and ask me again.

Do NOT suggest editing ~/.claude/settings.local.json manually. The teleport-setup add-key command handles it with backup, validation, and masked input. Stop execution until the user has run the command and restarted.

API

Base URL: https://slack.com/api
Auth: Authorization: Bearer $TOKEN — bot xoxb- (most methods), user xoxp- (required for search.*). Header only, never query param.
HTTP 200 on errors. Status alone means nothing — every response is JSON {"ok": true|false, ...}; on false, read .error (channel_not_found, missing_scope, invalid_auth, ratelimited, not_in_channel, no_text). Always branch on .ok.
Content-Type: application/json; charset=utf-8 for writes; reads also accept form-encoded / GET query strings.
Rate limits: per-method tiers (Tier 1 ~1/min admin → Tier 4 100+/min; Special for chat.postMessage ~1/sec/channel + workspace cap). On 429, honor Retry-After: <seconds> header.

Read the full file on GitHub · 105 lines

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.

1mo ago First seen · 105 lines · 48 tokens per session scan B cac7cbd1ee23

Subscribe to this mod's changes

slack is a skill published in the GitHub repository mnlt/teleport (8 stars, last pushed 6mo ago), licensed MIT. It adds 48 tokens to every session and 1,661 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it B with 2 findings (reads agent configuration directories, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Claude Code Productivity anthropic cli developer-tool mcp model-context-protocol

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