One-shot multi-band recall at a place (or lat/lng). Defaults to emem's standard at-a-glance band set; pass band / bands to override. Polygon-resolved places stay at the centroid by default (n_cells: 1) to keep multi-band calls cheap — pass n_cells: 2..=64 to fan out. When to use: Use when the use...
Part of the emem — Earth memory protocol server.
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AI agents use emem_at to create or modify resources in emem — Earth memory protocol. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call emem_at repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach emem — Earth memory protocol.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"emem_at": {
"limits": [
{
"counter": "emem_at_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full emem — Earth memory protocol policy for all 81 tools.
These attack patterns abuse exactly the kind of access emem_at gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
One-shot multi-band recall at a place (or lat/lng). Defaults to emem's standard at-a-glance band set; pass band / bands to override. Polygon-resolved places stay at the centroid by default (n_cells: 1) to keep multi-band calls cheap — pass n_cells: 2..=64 to fan out. When to use: Use when the user names a place and wants the standard situational readout (vegetation + elevation + landcover + recent weather) without picking bands. Polygon-aware: place that resolves to a polygon (park, lake, district) lands at the centroid unless n_cells widens it. For a single band, use the domain-specific shortcuts (emem_ndvi, emem_air, …) or emem_recall directly.. It is categorised as a Write tool in the emem — Earth memory protocol MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the emem — Earth memory protocol MCP server in PolicyLayer and add a rule for emem_at: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches emem — Earth memory protocol. Nothing to install.
emem_at is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the emem_at rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for emem_at. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
emem_at is provided by the emem — Earth memory protocol MCP server (oci:ghcr.io/vortx-ai/emem:latest). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 81 emem — Earth memory protocol tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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