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Integrate Trello with OpenClaw by building a small ClawHub skill that holds Trello credentials (API key + token or an OAuth flow), implements the Trello REST calls you need, and pairs that skill with an external, highly available webhook receiver and token-management service — the agent invokes Trello via standard REST (POST/GET to api.trello.com), and Trello delivers events to your public webhook which then forwards them into the skill invocation path. Keep long-lived services (webhook endpoint, queue, token refresh) outside the agent runtime, store secrets in ClawHub/secret env vars, and validate webhooks using a secret in the callback URL because Trello does not provide HMAC-signed requests.
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// Example authorize URL for Trello token
https://trello.com/1/authorize?expiration=never&name=YOUR_APP_NAME&scope=read,write&response_type=token&key=YOUR_KEY
curl "https://api.trello.com/1/members/me/boards?key=YOUR_KEY&token=YOUR_TOKEN"
curl -X POST "https://api.trello.com/1/cards" \
-d "key=YOUR_KEY" \
-d "token=YOUR_TOKEN" \
-d "idList=LIST_ID" \
-d "name=Automated card from OpenClaw skill" \
-d "desc=Created by agent action"
curl -X POST "https://api.trello.com/1/webhooks" \
-d "key=YOUR_KEY" \
-d "token=YOUR_TOKEN" \
-d "callbackURL=https://example.com/trello-webhook?secret=yourSecretHere" \
-d "idModel=THE_MODEL_ID" \
-d "description=Webhook for OpenClaw integration"
const express = require('express');
const fetch = require('node-fetch');
const app = express();
app.use(express.json());
const EXPECTED_SECRET = process.env.WEBHOOK_SECRET;
const SKILL_INVOKE_URL = process.env.SKILL_INVOKE_URL;
app.post('/trello-webhook', async (req, res) => {
// Quick verification response
res.sendStatus(200);
// <b>// Validate secret from callback URL</b>
const secret = req.query.secret;
if (!secret || secret !== EXPECTED_SECRET) {
return;
}
// <b>// Normalize minimal payload</b>
const payload = {
source: 'trello',
action: req.body.action,
model: req.body.model
};
// <b>// Forward to the skill invocation endpoint</b>
try {
await fetch(SKILL_INVOKE_URL, {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify(payload)
});
} catch (err) {
console.error('Failed to forward to skill', err);
}
});
app.listen(process.env.PORT || 3000);
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1
The immediate fix is to treat OAuth failures and refresh errors as authentication workflow failures: confirm the current access token is expired or revoked, validate the refresh token is present and unexpired, check client credentials/redirect URIs/scopes, and inspect the exact HTTP error body and status code. Rotate tokens only after safe revocation and store secrets outside the agent runtime.
Check: logs, response bodies (400/401/403), clock skew, env vars for client_id/secret, scopes, redirect_uri, and whether the refresh token is stored in secure external storage (not ephemeral agent state).
Record request/response pairs, validate token endpoints, ensure skills verify auth before execution, and move token refresh logic to an external service or secure ClawHub config so agents don’t lose state on restart.
2
Most likely the Trello webhook requests never reach the OpenClaw skill because the webhook callback URL is not publicly reachable/HTTPS, the runtime or skill isn’t bound to that route, or requests are rejected (firewall, missing env/API keys, signature mismatch) or the skill fails to respond with a quick 200. Check Trello delivery logs, your OpenClaw agent ingress and skill logs, and the ClawHub webhook configuration.
Do these checks in order and fix the first failing item:
// Minimal Express handler that logs and quickly responds 200
const express = require('express')
const app = express()
app.use(express.json())
app.post('/trello-webhook', (req, res) => {
<b>//</b> log body for debugging
console.log('webhook', req.headers, req.body)
res.sendStatus(200)
})
app.listen(process.env.PORT||3000)
3
Direct answer: Always implement an explicit mapping layer inside your OpenClaw skill: validate incoming payloads against the skill’s expected schema, transform/coerce fields to a canonical internal shape, log and surface mismatches, and fail-fast or apply safe defaults so the agent runtime and downstream APIs receive consistent data.
// map source API response to skill schema
function mapUser(src){
// validate required fields
if(!src.id) throw new Error('missing id');
return {
id: String(src.id), // coerce
name: src.fullName || `${src.first} ${src.last}` || 'Unknown',
email: (src.email||'').toLowerCase()
};
}
4
Direct: Treat each incoming webhook as idempotent: verify signature, extract the provider event_id, check a durable dedupe store (DB or Redis) with NX/set-if-not-exists and TTL, return 2xx for known events, and use idempotency keys for any outbound POSTs.
// Node + Redis
const ok = await redis.set(eventId,'1','NX','EX',3600); // returns 'OK' if new
if(!ok) return res.status(200).send('duplicate');
// process...
This prompt helps an AI assistant understand your setup and guide you through the fix step by step, without assuming technical knowledge.
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