setup-slack

Use this skill when the user asks to set up Slack messaging for mu.

Goal: get /mu ... working end-to-end in Slack, with the agent doing all local setup and asking the user only for Slack-console actions/secrets the agent cannot perform.

Contents

• Required user-provided inputs
• Agent-first workflow
• Evaluation scenarios
• Safety and UX requirements

Required user-provided inputs

• Public webhook base URL reachable by Slack (for example https://mu.example.com)
• Slack app Signing Secret
• Slack app Bot User OAuth Token (xoxb-...) for outbound replies/media

Agent-first workflow

0) Verify local prerequisites (agent)

command -v mu >/dev/null && echo "mu: ok"
command -v python3 >/dev/null && echo "python3: ok (required for config patching)"
command -v curl >/dev/null && echo "curl: ok (required for API checks)"
command -v jq >/dev/null && echo "jq: ok (required for filtered JSON checks)"

If any required command is missing, stop and ask the user to install it before proceeding.

1) Preflight local state

mu control status --pretty
mu store paths --pretty
mu control identities --all --pretty

If no running server is available when reload/route checks are attempted, ask the user to run mu serve in another terminal, then continue.

2) Drive user through Slack console steps (minimal ask)

Ask the user to do only these actions in Slack API UI:

1. Create/install a Slack app in target workspace.
2. Configure request URL for all inbound surfaces to:
   • https://<public-base>/webhooks/slack
3. Enable at least:
   • Slash command /mu
   • Event Subscriptions (app_mention)
   • Interactivity
4. Ensure bot scopes include:
   • app_mentions:read
   • chat:write
   • files:read
   • files:write
5. Return signing_secret and bot_token to the agent.

3) Agent patches mu config (do not ask user to edit JSON)

Use this canonical patch snippet (preserves unrelated keys):

export MU_SLACK_SIGNING_SECRET='<SLACK_SIGNING_SECRET>'
export MU_SLACK_BOT_TOKEN='<SLACK_BOT_TOKEN>'
config_path="$(mu control status --json | python3 -c 'import json,sys; print(json.load(sys.stdin)["config_path"])')"

python3 - "$config_path" <<'PY'
import json
import os
import sys
from pathlib import Path

path = Path(sys.argv[1])
if path.exists():
    data = json.loads(path.read_text())
else:
    data = {"version": 1, "control_plane": {}}

cp = data.setdefault("control_plane", {})
adapters = cp.setdefault("adapters", {})
slack = adapters.setdefault("slack", {})
slack["signing_secret"] = os.environ["MU_SLACK_SIGNING_SECRET"]
slack["bot_token"] = os.environ["MU_SLACK_BOT_TOKEN"]

path.parent.mkdir(parents=True, exist_ok=True)
path.write_text(json.dumps(data, indent=2) + "\n")
PY

Replace placeholder values with secrets from the user, then unset MU_SLACK_SIGNING_SECRET MU_SLACK_BOT_TOKEN after patching.

4) Reload and verify adapter status

mu control reload
mu control status --json --pretty
curl -sS http://localhost:3000/api/control-plane/channels | jq '.channels[] | select(.channel=="slack")'

Verify:

• configured: true
• active: true (when server is running)
• route /webhooks/slack

5) Identity link with least user effort

Preferred flow:

1. Ask user to send one Slack turn (for example /mu status).
2. Extract actor + tenant IDs from audit.
3. Link identity as operator.

mu store tail cp_adapter_audit --limit 50 --json \
  | jq -r '[.[] | select(.channel=="slack")] | last | "actor=\(.actor_id) tenant=\(.channel_tenant_id)"'

mu control link --channel slack --actor-id <actor-id> --tenant-id <tenant-id> --role operator
mu control identities --pretty

If audit rows are unavailable, ask user for Slack IDs (U... user id, T... workspace id).

6) Smoke test + forensic confirmation

mu control status --pretty
mu store tail cp_adapter_audit --limit 20 --pretty
mu store tail cp_outbox --limit 20 --pretty

Ask user to run /mu status again and confirm response delivery.

Evaluation scenarios

1. Happy path onboarding

   • Inputs: valid public base URL, signing_secret, bot_token, running mu serve.
   • Expected: /api/control-plane/channels reports Slack configured=true and active=true; Slack /mu status returns a response.

2. Signature validation failure

   • Inputs: wrong signing_secret configured.
   • Expected: inbound command is rejected; cp_adapter_audit shows deterministic signature/timestamp reason code; skill proposes secret rotation and reload as next step.

3. Outbound token missing/invalid

   • Inputs: webhook ingress works but bot_token missing or invalid.
   • Expected: ingress may ACK but delivery fails; cp_outbox/adapter audit expose concrete failure reason; skill guides user to update token and re-run smoke test.

Safety and UX requirements

• Never expose secrets in chat logs unnecessarily; redact in summaries.
• Do not overwrite unrelated config.json fields.
• Keep the user ask short and sequential (one external-console step at a time).
• If setup fails, report concrete reason codes from audit/outbox and propose the next smallest recovery step.