message.too_large

Refused 413 policy

The request body is larger than the bus accepts.

Outcome	Refused, 413
Source	policy: This bus's operational rules (identity, grants, size, idempotency, story ownership). Not a verdict of the SOM standard.
Checked at	Size (see the order of checks)

What it means

The body is over 240,000 bytes (UTF-8). Media never travels the bus: messages carry references to it.

How to fix it

Send references (media_refs, content_refs, a delivery.media_available message), not media or long text.

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Branch on the rule id, never on the violation's message text. All rules: rule catalogue.