Every AI agent that calls an external API hits the same wall.
The response comes back as raw JSON, deeply nested, verbose, full of fields the agent doesn't need. Before the agent can reason over it or take any action, someone has to filter it, reshape it, maybe merge it with another payload.
Most teams solve this one of three ways. They dump the raw JSON into the context window and let the LLM figure it out. They spin up a Python sidecar. Or they make an extra round-trip to a data service. None of these scale.
We built DataGrout Data to eliminate all three.
What Data does
Data is a suite of deterministic JSON manipulation tools exposed as MCP tools, callable directly by any AI agent:
→ data.filter({ payload, where: [{ field: "status", op: "eq", value: "active" }] })
→ data.sort({ payload: "$prev.records", by: "created_at", dir: "desc" })
→ data.take({ payload: "$prev.records", n: 50 })
No Python. No extra runtime. Pure deterministic output the agent can immediately act on.
The full operation set
data.filter — declarative filtering with 10+ operators (eq, neq, gte, lte, contains, starts_with, is_null...)
data.sort — multi-field sorting with per-field direction control
data.aggregate — reduce a field to a sum / mean / min / max / count.
data.merge — combine two JSON datasets on a shared field
data.flatten — simplify deeply nested payloads in one pass
data.map — split large arrays into individual items for parallel processing
Why deterministic matters
Every Data operation is pure, no AI generation touches the transformation layer. The agent decides what to do, Data executes it exactly. This eliminates token waste and hallucination risk on the data layer entirely.
How it handles large datasets
Data accepts cache_ref outputs, so agents can chain operations on large payloads without retransmitting the full dataset at each step. The output of data.filter passes as a ref into data.sort — not as raw JSON.
Where it fits in the DataGrout suite
Data handles raw JSON payloads from API responses. Frame handles columnar tabular data. Together they cover the two most common data shapes agents encounter in enterprise workflows.
Launched on Product Hunt today, would love your support and feedback!
👉 datagrout.ai/tools/data