webhooks skillA
webhooks is agent-read markdown (skill) from nahid-sparktales/agent-dispatcher: Receive or send HTTP webhooks correctly — signature verification on the raw body, fast acknowledgement, deduplication, out-of-order handling, retry and dead-letter behaviour, and the delivery contract a consumer needs. Use when adding or debugging a webhook endpoint, when integrating a provider's events, or when your own service has to notify others of changes. Not for internal queue or event-bus messages that never cross an HTTP boundary, and not for general outbound API retry policy..
Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.
What the file says
# Webhooks A webhook is an untrusted HTTP request that claims to be an event. Almost every webhook bug is one of four things: the signature was checked against a re-serialized body, the handler did its work before acknowledging, the same event arrived twice, or events arrived out of order. ## When this fires Building or reviewing a webhook receiver, integrating a provider's events, or designing outbound event delivery to consumers. It does not fire for an internal queue consumer — that has no HTTP trust boundary, though its idempotency requirements are the same. ## Procedure — receiving 1. **Verify before you parse.** Compute the signature over the **raw request body exactly as received**, before any JSON decode or middleware re-serialization, and compare in constant time. Check the signed timestamp against a tolerance window so an old capture cannot be replayed. A request that fails verification gets a 4xx and nothing else — no logging of the payload as if it were real, no side effects. Never identify the sender by a field inside the payload. 2. **Confirm the secret's source.** Per-endpoint secret from configuration, never committed, and …
Read the whole file at its exact version.
How to install
mdr add nahid-sparktales/agent-dispatcher/webhooks@git:20260919.a0d4f55mdr add nahid-sparktales/agent-dispatcher/webhooks@sha256:38a60bdef1295ebbPin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
[](https://markdownregistry.com/a/art_pqpuwqdnc7ytn35a)
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Versions
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (7711 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
nahid-sparktales/agent-dispatcher · 49 stars · license MIT · pushed 2026-09-23 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_pqpuwqdnc7ytn35a GET https://markdownregistry.com/api/v1/resolve?ref=nahid-sparktales/agent-dispatcher/webhooks GET https://markdownregistry.com/api/v1/blob/38a60bdef1295ebbedb87524738cb84b437402c25b74a0219bc4aa03afcaa086
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