webhook-transforms
Generic framework for converting external events (SMS, meetings, social mentions) into brain-ingestible signals. Define a transform function, register a webhook URL, and incoming events get processed through the brain pipeline.
Source facts
- Repository
- garrytan/gbrain
- Last source activity
- October 7, 2026 at 02:06
- Detected SKILL.md language
- English
- Stars
- 31,217
- Forks
- 4,664
Install options
The review-first prompt is selected by default. You can switch to a direct command or download a local copy.
Review the source files
Read SKILL.md and any companion files shown by SkillsMP before deciding whether to install.
Showing SKILL.md
SKILL.md
Source instructions · Read-only preview- name
- webhook-transforms
- version
- 1.0.0
- description
- Generic framework for converting external events (SMS, meetings, social mentions) into brain-ingestible signals. Define a transform function, register a webhook URL, and incoming events get processed through the brain pipeline.
- triggers
- ["set up webhook","process webhook event","transform this event"]
- tools
- ["put_page","add_timeline_entry","search"]
- mutating
- true
- when_to_use
- Use when the user asks: "set up webhook", "process webhook event", "transform this event".
# Webhook Transforms
## Contract
This skill guarantees:
- External events are transformed into brain pages with proper citations
- Raw payloads are preserved (dead-letter queue if transform fails)
- Entity extraction runs on every transformed event
- Input sanitization: no raw HTML/script passes to brain pages
- Error handling: transform failure logs raw payload, retries once
## Phases
1. **Define transform.** Map event schema to brain page format:
- Input: raw webhook payload (JSON)
- Output: brain page content (markdown) + metadata (slug, type, citations)
- Must sanitize: strip HTML tags, escape script content
2. **Register webhook URL.** Provide the external service with the webhook endpoint.
3. **On event received:**
- Parse payload
- Run transform function
- Write brain page via `gbrain put`
- Extract entities, run enrichment
- Add timeline entries to mentioned entities
- Sync: `gbrain sync`
4. **Error handling:**
- If transform throws: log raw payload to `_dead-letter/{timestamp}.md`
- Surface error type to agent
- Retry once
- Don't lose events
## Example Transforms
### SMS Received
```
Input: {from: "+1555...", body: "Meeting moved to 3pm", timestamp: "..."}
Output: Timeline entry on sender's brain page + task update if action item detected
```
### Meeting Completed
```
Input: {title: "Weekly sync", attendees: [...], transcript: "...", summary: "..."}
Output: Delegate to meeting-ingestion skill
```
### Social Mention
```
Input: {platform: "twitter", author: "@handle", text: "...", url: "..."}
Output: Brain page in media/ + entity extraction + backlinks
```
## Output Format
Event transformed and written to brain. Report: "Webhook: {event_type} from {source}
→ {brain_page_path}"
## When it fails
Follow the [agent operator protocol](../conventions/agent-operator-protocol.md) for any gbrain error `code`, exit code, `[AGENT]` block or notice block. Specific to this skill:
- A transformed write returns `write_pending` (exit 10): the event is accepted; record the request id and poll it, never replay the event under a new id.
- `source_binding_required` / `insufficient_scope`: the webhook's token cannot write that source; tell the user which grant the brain host's operator must add.
- A malformed payload: reject it with the parse error and log it; do not write a partial page.
## Anti-Patterns
- Passing raw HTML/script to brain pages (XSS risk)
- Silently dropping events when transform fails (use dead-letter queue)
- Processing webhooks without entity extraction
- Not sanitizing external input before brain writes
View on GitHub