A command-line tool for using Slack, a team messaging service, through its web API. It returns machine-readable JSON and covers Slack's public operations, such as messages, channels, files, search, and reminders.

It helps send and read messages, look up users and channels, manage files and reactions, search conversations, and work with pins, bookmarks, reminders, and user groups.

It gives coding agents a consistent way to read and change Slack data without manually using the Slack website.

slack-cli — Skill for Claude Code and Codex by Elnora-AI: A command-line tool for using Slack, a team messaging…

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.

agentmods

npx agentmods add skills/elnora-ai/elnora-slack/slack-cli

Any agent

npx skills add Elnora-AI/elnora-slack --skill slack-cli

Clone the repo

git clone --depth 1 https://github.com/Elnora-AI/elnora-slack

Made for: Claude Code, Codex.

Or install slack-workspace, the plugin that ships this one along with the rest of its 2 skills, 1 command, 1 hook.

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/elnora-ai/elnora-slack/slack-cli.svg)](https://agentmods.dev/skills/elnora-ai/elnora-slack/slack-cli)

Your own site

<a href="https://agentmods.dev/skills/elnora-ai/elnora-slack/slack-cli"><img src="https://agentmods.dev/badge/skills/elnora-ai/elnora-slack/slack-cli.svg" alt="Measured on agentmods" height="20"></a>

Per session 164 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,608 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

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	$0.00164	$0.01608
Opus 5	$0.00082	$0.00804
Sonnet 5	$0.00033	$0.00322
Haiku 4.5	$0.00016	$0.00161

Measured 4d ago against content hash 37e52191a543, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

slack-cli 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 4d 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.

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.

skills/slack-cli/SKILL.md · 159 lines

How it starts

The opening of the file, as written. The whole thing — 159 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Slack CLI

The complete Slack Web API from the command line. 201 methods, 29 command groups.

The elnora-slack binary must be on your PATH (npm install -g @elnora-ai/slack). Verify with elnora-slack auth test. If that fails, see INSTALL_FOR_AGENTS.md.

Note: the binary is elnora-slack, not slack — Slack ships its own official slack CLI and we don't shadow it.

All commands print JSON to stdout; errors go to stderr with a typed exit code. Add --compact for token-efficient output, --fields <list> to select fields, and --output table|csv where a list is returned.

Workspace reference (cached)

Before looking up users or channels via the API, check the cached reference files in $SLACK_REFERENCES_DIR (or ${CLAUDE_PLUGIN_ROOT}/references/):

Users: workspace-users.md — IDs, usernames, emails, quick-lookup aliases
Channels: workspace-channels.md — IDs, names, routing table

Read these first when you need an ID. Only call the API if the cache doesn't have it. The files ship as *.template.md (fake rows) until you run /slack-sync to generate the real ones.

Auth

Token resolution order: SLACK_TOKEN / SLACK_BOT_TOKEN / SLACK_USER_TOKEN from the environment, then ~/.config/elnora-slack/.env, then a .env next to the CLI. search.* requires a user token (SLACK_USER_TOKEN, xoxp-).

Quick reference

Messaging

elnora-slack chat postMessage --channel CHANNEL_ID --text "Hello"
elnora-slack chat update --channel CHANNEL_ID --ts TIMESTAMP --text "Updated"
elnora-slack chat delete --channel CHANNEL_ID --ts TIMESTAMP
elnora-slack chat scheduleMessage --channel CHANNEL_ID --text "Later" --post-at UNIX_TS

Reactions

elnora-slack reactions add --channel CHANNEL_ID --name white_check_mark --timestamp MSG_TS
elnora-slack reactions remove --channel CHANNEL_ID --name white_check_mark --timestamp MSG_TS
elnora-slack reactions get --channel CHANNEL_ID --timestamp MSG_TS

Read the full file on GitHub · 159 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.

4d ago First seen · 159 lines · 164 tokens per session scan A 37e52191a543

Subscribe to this mod's changes

slack-cli is a skill published in the GitHub repository Elnora-AI/elnora-slack (1 stars, last pushed 3d ago), licensed Apache-2.0. It adds 164 tokens to every session and 1,608 once invoked, about $0.0008 per session on Opus 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 2026-08-31.

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