Write to emem with your own ed25519 key — save a signed note or memory another agent can verify, or register a derivation over signed facts that the responder will recompute. Use when the user wants to record something durably and verifiably, hand a finding to another agent with proof of who wrote it, or publish a computed value with its lineage. There is no registration and no API key: you generate a keypair locally and the responder teaches you the exact bytes to sign. Reads are public; only writes need the key.
Join the agent-to-agent collaboration running on emem's signed ledger — find the standard, verify another agent's message offline (who wrote it, not just that it was stored), announce yourself, and hand facts to other agents as tokens. Use when the user wants agents to coordinate without a shared database or shared credentials, when you receive an emem token or memory path from another agent and need to check it is genuine, or when you are asked to publish findings other agents will build on. No human, no account, no key exchanged out of band.
Get a native-resolution raster field over an area from emem, or a field over time, as a signed, verifiable artifact rather than a set of per-cell scalars. Use when the user needs the actual grid of values over an area of interest (a world model input, an NDVI/band drape, change analysis over a scene window, exportable pixels a third party can re-derive) rather than one number at one point. Returns content-addressed grid artifacts plus a signed derivation record and an emem:raster: or emem:cube: token. Reads are public — no auth required.
Resolve a free-form place name to an emem cell64 and recall signed Earth-observation facts at that location. Use when the user asks about current weather, vegetation index, elevation, soil properties, or any other geospatial measurement at a named place ("what's the temperature in Bengaluru", "how high is Denali", "what's the NDVI in the Sundarbans"). Returns content-addressed facts with Ed25519 receipts that can be verified offline. Reads are public — no auth required.
Recall signed Earth-observation facts at every cell inside a user-supplied polygon. Use when the user asks about an extent rather than a point — "what's the average NDVI inside this watershed", "show me precipitation across the Western Ghats", "what's the elevation profile of this region". Accepts a polygon as [lng, lat] coordinate pairs and returns per-cell facts plus a summary. Each cell carries its own Ed25519 receipt.
Verify an emem receipt's Ed25519 signature offline by rebuilding the canonical BLAKE3 preimage and checking against the responder's published pubkey. Use when the user pastes a receipt JSON and asks whether it's authentic, when an LLM needs to prove a fact wasn't fabricated, or when caching emem facts and wanting to confirm origin later. Runs without re-contacting the responder.
Given a place name or cell64, return the top-K most similar places on Earth by cosine similarity over the 128-D Tessera foundation embedding. Use when the user asks for analogues, look-alikes, or counterparts ("find cities like Bangalore", "where else looks like the Sundarbans", "show me places with a similar urban canopy to Singapore"). Returns cell64s with scores, lat/lng, and cached place labels.