slack-comms

A Slack communication command works with Slack, a workplace messaging service, to read channels and manage messages and threads.

In plain words
What is it for?
It is for reading recent messages, posting updates, replying in threads, summarising channel activity, and sending action notifications.
Why use it?
It reduces the need to search channels, compose updates, and summarise conversations manually.

Command

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 commands/saigonxiii/evc/slack-comms
Clone the repo
git clone --depth 1 https://github.com/SaigonXIII/evc
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,370 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.

ModelPer sessionOnce invoked
Fable 5 $0.00000 $0.01370
Opus 5 $0.00000 $0.00685
Sonnet 5 $0.00000 $0.00274
Haiku 4.5 $0.00000 $0.00137

Measured 3d ago against content hash 10b80c1ff6e2, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

slack-comms 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 3d 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.

_templates/commands/slack-comms.md · 210 lines

How it starts

The opening of the file, as written. The whole thing — 210 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Slack Comms

Read, write, and manage Slack communications. Supports reading channel history, posting messages, summarizing threads, replying in threads, and posting structured action notifications.

Trigger

User invokes /slack-comms <CHANNEL> <ACTION> or says "check Slack", "post to Slack", "summarize channel"

Actions:

  • read — Fetch recent messages from a channel
  • post <message> — Compose and post a message
  • summarize — Digest recent activity into key points
  • thread <ts> <message> — Reply in a specific thread
  • notify <action-summary> — Post an action notification with status

Examples:

/slack-comms #engineering read
/slack-comms #general post Shipped the new landing page — link in thread
/slack-comms #general summarize
/slack-comms #engineering thread 1234567890.123456 Updated the PR
/slack-comms #updates notify Created 3 tickets from today's meeting

Read Mode

Fetch and present recent messages from a channel.

  1. Retrieve the last 20 messages (or user-specified count).
  2. For each message, extract: author, timestamp, text, thread reply count.
  3. Present in a readable format:
### #<channel> — Recent Messages

| Time | Author | Message | Threads |
|---|---|---|---|
| 10:23 | Alice | Meeting moved to Thursday | 3 replies |
| 10:45 | Bob | Updated the deck — link in thread | 1 reply |
| 11:02 | Slackbot | Reminder: standup in 15 min | — |

If Slack MCP is available: Use Slack MCP tools to fetch messages. If not available: Ask the user to paste the messages or provide a channel export.


Post Mode

Compose and post a message to a channel.

Composition Guidelines

  • Professional but conversational. Match {{COMPANY_NAME}}'s internal tone.
  • Lead with the action or decision. Don't bury the point.
  • Use emoji for status:
    • :white_check_mark: Done / Approved
    • :warning: Blocked / Needs attention
    • :question: Needs input / Unclear
    • :rocket: Shipped / Deployed
    • :memo: Draft / For review
  • Link to tickets and PRs. Use full URLs for issues and PRs.
  • Keep it concise. Slack messages should be scannable, not essays.

Read the full file on GitHub · 210 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.

  1. 3d ago First seen · 210 lines · 0 tokens per session scan A 10b80c1ff6e2

Subscribe to this mod's changes

slack-comms is a command published in the GitHub repository SaigonXIII/evc (56 stars, last pushed 2mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,370 tokens. 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.