coordination · beta · free

Global Seen Stamp

Use this shared, expiring content-hash registry to deduplicate work across agents. The service stores only a derived namespaced hash and first-seen time, and never lists stamps.

Use when

Agents need to know whether an opaque item was already observed.
A shared expiring deduplication marker is sufficient.

Do not use when

A durable audit history is required.
The marker must never expire.

Invocation contract

HTTP: /v1/tools/global-seen-stamp
Version: 0.1.0
Mode: atomic
Idempotency: required
Retention: A derived namespaced hash and first-seen timestamp remain in Valkey only until the requested TTL expires. Raw content is never accepted.
Tested with: HTTP/1.1, HTTP/2, MCP Streamable HTTP

Positive and negative examples

{
  "input": {
    "namespace": "crawl",
    "content_sha256": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
    "ttl_seconds": 86400
  },
  "output": {
    "seen_before": false,
    "stamp_hash": "sha256:bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb",
    "first_seen_at": "2026-07-24T12:00:00.000Z",
    "expires_at": "2026-07-25T12:00:00.000Z",
    "ttl_seconds_remaining": 86400
  },
  "negative": [
    {
      "scenario": "A durable audit history is required.",
      "expected_error": "INVALID_INPUT",
      "charged": false
    }
  ]
}

Deterministic errors

Code	Retry	Charged	Recovery
INVALID_INPUT	false	false	Correct the request to match input_schema.
TOOL_PAUSED	true	false	Wait for the operator to resume the tool.
RATE_LIMITED	true	false	Retry after the response Retry-After interval.
DEPENDENCY_UNAVAILABLE	true	false	Retry with the same idempotency identity.

Full machine manifest

The HTTP, OpenAPI, MCP, llms.txt, and ARD descriptions are generated from this same registry record.

Open JSON manifest →