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Agent skill

Slack File

by blockscout in blockscout/frontend

Download Slack attachments by file ID, or upload local files into a Slack thread.

Custom licenceAuto-check passedProductivity & Automation

Install Slack File

skills CLI
$ npx skills add blockscout/frontend --skill slack-file -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install blockscout/frontend slack-file --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/blockscout/frontend.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/slack-file .claude/skills/slack-file && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
slack-file
GitHub stars
307
Token cost
~540 tokens
SKILL.md length
238 words
Files
2 (incl. scripts)
Skills in repo
23
Repo updated
First seen
Licence
Custom licence

At a glance

Download Slack attachments by file ID, or upload local files into a Slack thread.

  • Works in 2 steps: Ready → Run
  • A Slack message lists Files: whose contents matter
  • SKILL.md covers 1. Ready, 2. Run and Setup
  • Calls brew

What it does

Slack File is an agent skill from blockscout/frontend. Download Slack attachments by file ID, or upload local files into a Slack thread. Use when a Slack message lists Files: whose contents matter, or when posting a file to Slack; the MCP connector reports metadata only. Guides Keychain token setup if missing.

Its SKILL.md is about 540 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including scripts.

It sits in Productivity & Automation, covering App automation through connectors. It works with Slack. The repository describes itself as: Front-end application for Blockscout chain explorer.

When your agent uses it

  • A Slack message lists Files: whose contents matter
  • Posting a file to Slack
  • The MCP connector reports metadata only

Example prompts

  • “/slack-file”

Workflow steps

2 steps, taken from the step headings in SKILL.md.

  1. Ready
  2. Run

What it can do on your machine

Read from SKILL.md and the folder at commit 9438622. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Ships 1 file in scripts/, which the agent can run.

    Shell commands in SKILL.md call:

    • brew

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    Links to these hosts (documentation or services it may open):

    • blockscout.slack.com

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Slack File loads about 540 tokens when it runs. Until then it costs about 67 tokens; SKILL.md has 238 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~67
When it runs · the whole SKILL.md, loaded when a task matches
~540

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.

SKILL.md

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 238 words (~540 tokens).

“The Slack MCP connector reports attachment metadata only. This skill's script is the download and upload path. Other skills that need Slack file bytes follow this skill.”

— opening of SKILL.md by blockscout, Custom licence
name
slack-file

Read the full SKILL.md on GitHub

Files

SKILL.md and 1 other file (scripts) in .agents/skills/slack-file of blockscout/frontend.

  • SKILL.md
  • scripts/slack-file

Open the folder on GitHubat commit 9438622

Compare with similar skills

Slack File next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Slack File compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Slack File this skillblockscout/frontend307—~540Automated safety check: PassCustom licence
Composioyc-software/qm15k—~1.6kAutomated safety check: PassMIT
Connect Apps with ComposioComposioHQ/awesome-claude-skills77k3 repos~557Automated safety check: PassNone
Setting Up RelayfileAgentWorkforce/relay8661 repos~3.3kAutomated safety check: PassApache-2.0
Composio Cloud Toolsquarqlabs/argus277—~543Automated safety check: PassApache-2.0
Slack Automationdavila7/claude-code-templates32k8 repos~2.4kAutomated safety check: PassMIT

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  • Composio

    yc-software/qm

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    15k GitHub stars~1.6k tokensUpdated today
    Productivity & AutomationAuto-check passed

  • Connect Apps with Composio

    ComposioHQ/awesome-claude-skills

    Connects an agent to 1000+ external apps through the Composio Tool Router plugin, so it can actually send emails, create issues and post messages instead of only drafting them.

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  • Setting Up Relayfile

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    866 GitHub starsUsed in 1 repo~3.3k tokens
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  • Composio Cloud Tools

    quarqlabs/argus

    Routes requests to external SaaS apps such as GitHub, Gmail, Google Calendar, Slack, Notion and Linear through cloud tools, with safeguards on irreversible actions.

    277 GitHub stars~543 tokensUpdated 4 mo ago
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  • Slack Automation

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More from blockscout/frontend

All 23 skills in this repo

  • Add Env Var

    blockscout/frontend

    Step-by-step checklist for adding a new NEXTPUBLIC environment variable.

    307 GitHub stars~1.6k tokensUpdated today
    Auto-check: notes

  • Add New Page

    blockscout/frontend

    Scaffold a new page (index / detail / general) and optionally wire it to API data.

    307 GitHub stars~3.9k tokensUpdated today
    Auto-check passed

  • Create Issue

    blockscout/frontend

    Create a GitHub issue from the available context. An agent skill from blockscout/frontend.

    307 GitHub stars~1.1k tokensUpdated today
    Auto-check passed

  • Deprecate Env Var

    blockscout/frontend

    Checklist for deprecating a NEXTPUBLIC environment variable — immediate removal, or a grace period before a later removal.

    307 GitHub stars~2.6k tokensUpdated today
    Auto-check: notes

  • Publish Beta Types

    blockscout/frontend

    Publish a beta version of a @blockscout/-types npm package and pin it here.

    307 GitHub stars~1.1k tokensUpdated today
    Auto-check passed

  • Resolve API URL

    blockscout/frontend

    Resolve the real request URL of an API resource on a live Blockscout instance (service:name + instance → full URL).

    307 GitHub stars~865 tokensUpdated today
    Auto-check passed

Works with

Categories

Questions about Slack File

What does Slack File do?

Download Slack attachments by file ID, or upload local files into a Slack thread. Slack File is an agent skill from blockscout/frontend. Download Slack attachments by file ID, or upload local files into a Slack thread.

When should I use Slack File?

Slack File fits situations like: A Slack message lists Files: whose contents matter; posting a file to Slack; the MCP connector reports metadata only.

How do I install Slack File in Claude Code?

Run `npx skills add blockscout/frontend --skill slack-file -a claude-code`. Or copy the skill folder (.agents/skills/slack-file in blockscout/frontend) into .claude/skills/slack-file in your project. Claude Code loads it when a task matches its description.

How do I install Slack File in Codex?

Run `npx skills add blockscout/frontend --skill slack-file -a codex`. Or copy the skill folder (.agents/skills/slack-file in blockscout/frontend) into .agents/skills/slack-file in your project. Codex loads it when a task matches its description.

Can I use Slack File in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add blockscout/frontend --skill slack-file -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/slack-file, .gemini/skills/slack-file, .github/skills/slack-file and .opencode/skills/slack-file in your project.

What does Slack File need to run?

Going by SKILL.md and its folder, Slack File needs the command-line tools its instructions call (brew).

Does Slack File access the network?

SKILL.md names 1 domain. As links in the text: blockscout.slack.com. This is read from the text; nothing was executed.

Is Slack File safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does Slack File use?

Slack File has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Slack File use?

About 540 tokens (SKILL.md is roughly 2.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Slack File?

Skills that share tags, products or a category with Slack File: Composio (yc-software/qm, 15k stars), Connect Apps with Composio (ComposioHQ/awesome-claude-skills, 77k stars), Setting Up Relayfile (AgentWorkforce/relay, 866 stars) and Composio Cloud Tools (quarqlabs/argus, 277 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Slack File?

blockscout (a GitHub organization) maintains it in blockscout/frontend, which has 307 GitHub stars. The repository holds 23 skills in this directory. The repository was last updated on October 7, 2026.

Source: blockscout/frontend on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.