deploy: 2ad5a72

Author: github-actions[bot]

2.0/llms-full.txt

@@ -9858,6 +9858,29 @@ filesystem path. Object-storage policies such as `s3`, `gcs`, and `azure` use
 an explicitly configured filesystem disk and bucket/prefix settings on the
 server.
 
+### External Payload Reference Envelope
+
+The external payload reference is a stable wire envelope. SDKs may decode it
+into native helper types, but HTTP clients should treat these field names as
+the contract:
+
+| Field | Required | Meaning |
+| --- | --- | --- |
+| `schema` | yes | Must be `durable-workflow.v2.external-payload-reference.v1`. Unknown schemas fail closed. |
+| `uri` | yes | Driver-owned object location, such as `file:///...`, `s3://bucket/prefix/object`, `gs://bucket/prefix/object`, or `azure://container/prefix/object`. |
+| `sha256` | yes | Lowercase hex SHA-256 of the stored encoded bytes. SDKs and the server verify it before decode. |
+| `size_bytes` | yes | Byte length of the stored encoded payload. Mismatch is an integrity failure. |
+| `codec` | yes | Payload codec for the stored bytes, for example `json` or the SDK payload codec name. |
+| `expires_at` | no | ISO-8601 expiry hint for retention/GC. Missing means the namespace retention policy owns cleanup. |
+
+Payload offload is threshold-gated by the namespace storage policy. Inline
+payloads continue to use the normal payload envelope until encoded bytes exceed
+`threshold_bytes`; then the driver writes bytes and history stores the reference
+envelope. Replay and history export must fail loudly when a referenced blob is
+missing, mutated, outside the configured prefix, or owned by an unavailable
+provider. They must not silently replace a missing object with `null`, `{}`, or
+an empty byte string.
+
 For the full request-authority contract, including namespace resolution,
 role-scoped credentials, and worker registration fields, see
 [Namespace, Auth, And Worker Registration](/docs/2.0/polyglot/namespace-auth-workers).
@@ -10525,6 +10548,13 @@ its `external_payload_storage` policy. `storage:test` returns the diagnostic
 status plus `small_payload` and `large_payload` result objects; automation
 should branch on those fields instead of parsing the human table.
 
+The diagnostic is also the fastest operator check for the reference-envelope
+contract. A passing large-payload result proves the selected policy can write
+encoded bytes, return a `durable-workflow.v2.external-payload-reference.v1`
+reference, read the object back, and verify `size_bytes` plus `sha256`. A failed
+diagnostic should be treated as a storage-policy problem before workflows are
+allowed to offload payloads through that namespace.
+
 ## System Commands
 
 System commands expose server maintenance passes as explicit, scriptable
@@ -10971,6 +11001,26 @@ The reference schema is `EXTERNAL_PAYLOAD_REFERENCE_SCHEMA`
 not add cloud SDK dependencies to `durable-workflow`; applications pass their
 already configured S3, GCS, or Azure clients.
 
+The wire envelope fields are intentionally small and stable:
+
+```json
+{
+  "schema": "durable-workflow.v2.external-payload-reference.v1",
+  "uri": "s3://dw-payloads/billing/run-001/input.json",
+  "sha256": "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef",
+  "size_bytes": 1048576,
+  "codec": "json",
+  "expires_at": "2026-05-22T00:00:00Z"
+}
+```
+
+`ExternalPayloadReference.from_dict()` rejects unknown schemas and malformed
+fields. `fetch_external_payload()` verifies `size_bytes` and `sha256` before
+returning bytes, and raises `ExternalPayloadIntegrityError` when the object is
+missing, truncated, or mutated. Worker replay should use `ExternalPayloadCache`
+only after verification, so repeated history reads avoid refetching the same
+blob without weakening integrity checks.
+
 ### Cluster and Task Queues
 
 | Method | Returns | Notes |

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