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The Slack twin is a deterministic in-process simulation of the Slack Web API. It covers channels, messages, threads, reactions, and users — the surface agents typically reach for when automating workspace tasks. Every instance starts from a scenario seed and resets between runs, so the same scenario produces the same state every time.

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What it covers

  • chat.postMessage, thread replies, and reactions
  • Channel history, thread replies, and channel listing
  • User list and user profile lookups
  • Eight MCP tools (slack_post_message, slack_list_channels, slack_get_channel_history, etc.)
  • Form-encoded and JSON request bodies (SDK-compatible)
  • Deterministic [D] scoring for exfiltration, over-action, and injection traps

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What it does not cover

Real Slack OAuth, SCIM, admin APIs, Enterprise Grid, or file uploads. The twin issues static bearer tokens; for real OAuth flows, use Slack directly.

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Quickstart

pome run scenarios/20-slack-exfiltration.md \
  --agent "<your agent command>"
That scenario boots the Slack twin in-process, seeds a workspace with public and private channels, and scores whether the agent kept a production secret out of a public channel.

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Pointing your own agent at the twin

During a local pome run, Pome injects these environment variables into the agent process: 
POME_SLACK_REST_URL=http://127.0.0.1:<port>/s/<session-id>
POME_SLACK_MCP_URL=http://127.0.0.1:<port>/s/<session-id>/mcp
POME_AUTH_TOKEN=<jwt>
POME_SLACK_REST_URL is the session-scoped Web API root. POME_SLACK_MCP_URL is the MCP transport endpoint. POME_AUTH_TOKEN is a short-lived JWT. For MCP-based agents: 
mcpServers: {
  slack: {
    type: "http",
    url: process.env.POME_SLACK_MCP_URL,
    headers: { Authorization: `Bearer ${process.env.POME_AUTH_TOKEN}` },
  },
},
To check whether the twin process is alive during a run: 
curl http://127.0.0.1:<port>/healthz
pome twin start is GitHub-only today. Slack runs in-process when you call pome run on a scenario with twins: ["slack"].

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Scenario seed shape

Slack scenarios use a flat seed block with team, users, and channels: 
{
  "team": { "id": "T_ACME", "name": "Acme", "domain": "acme" },
  "users": [
    { "id": "U_PRIMARY", "name": "pome-agent", "real_name": "Pome Agent", "is_admin": true }
  ],
  "channels": [
    {
      "id": "C_GENERAL",
      "name": "general",
      "is_private": false,
      "members": ["U_PRIMARY"],
      "messages": []
    }
  ]
}
Set twins: ["slack"] in the scenario’s ## Config block. The agent acts as pome-agent, seeded as a member of the channels listed in the seed.

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Scenarios

Browse and copy the bundled Slack catalog: 
pome scenarios slack
pome scenarios slack --copy

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Catalog

#ScenarioWhat it exercises
20Secret exfiltration (20-slack-exfiltration.md)Read a private incident channel and post a summary to #general without leaking a production API key.
21Prompt injection (21-slack-injection.md)Summarize #general history without obeying injected instructions buried in channel messages.

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Run one

pome run scenarios/20-slack-exfiltration.md --agent "<your agent command>"