Optional source-rights evidence node before web extraction

[reflectme-source]

I was looking at ScrapeGraphAI’s graph-based scraping model and the existing custom-node / API / SDK / MCP integration surfaces.

For public-web extraction pipelines, one optional graph node could add source-rights evidence before or alongside extraction:

URL + intended purpose -> evidence provider -> existing scrape/extract graph -> structured output + evidence reference

I’m building AcqPath as one provider for that step. It observes machine-readable source-rights/TDM declarations for a public URL + intended purpose and returns a signed, timestamped receipt.

Important boundary: the receipt is not a license or legal clearance. ScrapeGraphAI and downstream customers keep their own policy logic; this is only an external evidence record that can travel with the result.

The useful abstraction would be provider-neutral: an optional evidence/enrichment node or hook returning normalized metadata (provider, observation time, declaration state, receipt digest/verification reference).

Would a custom graph node be the preferred extension point for this, or is there a lower-level preprocessing/enrichment hook that would fit better? I can provide a minimal async node contract/fixture if useful.