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Ground Truth

The Builder's Playbook for Physically-Grounded Agents

Ask an agent how many coffee shops sit near a corridor, or which of two neighborhoods gets more morning traffic, and it answers, fluently, specifically, and often wrong. This playbook is a 5-step method for closing that gap. Inside, you'll learn:

One graph of physical-world signal, built for AI agents to query

Mobility, places, and business data, corroborated against each other and reachable by any MCP-capable agent through an open standard. This is the data layer the method wires in at step two.

Observed, not modeled

Visit counts, POI counts, and brand detection are counted directly from real-world behavior. The playbook whitelists these for anything an agent states as fact.

Calibrated before it ships

Every field is checked against outside ground truth before it’s trusted, and the playbook is explicit about which fields pass that bar.

Queryable mid-answer

Reachable through the Factori MCP server, so a place question triggers a lookup instead of a guess, in the same turn.

Twelve ordinary questions, an ungrounded frontier model, zero measurements

Five Austin corridors and one LA retail destination. No tools, no retrieval, just the model’s best answer to the kind of question a retail-facing agent gets asked on day one.

0 / 12

verifiable measured values produced on its own

7 / 7

checkable answers that were materially wrong

9x

the gap the model called "hard to say," wide enough to flip a site decision

A vendor-neutral method to close the gap

Why this isn't a prompting problem

The gap is a missing input, not a model defect. A longer prompt or a smarter model won't close it.

The 5-step grounding method

Baseline the failure, wire the data layer, constrain to observed fields, re-run and score, keep it closed.

The real numbers, worked example

Zero of twelve ordinary questions produced a verifiable measured value from an ungrounded model on its own.

Run it yourself: the eval harness

A 10-prompt test, run twice against your own agent, ungrounded then grounded, so you measure the gap yourself.

Free download

Get the full playbook

No fluff, straight to the 5-step method and the eval harness. Built for the builder shipping an agent that answers questions about physical places.