Compute a weighted sum of all bands in a raster using specified weights. Parameters: - source: Path to the input multi-band raster file. - weights: List of weights (must match number of bands and sum to 1). - destination: Path to save the output single-band raster.
AI agents use weighted_band_sum to create or update resources in GIS MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your GIS MCP Server environment.
This tool performs a computational operation (weighted band sum) on raster data and saves the result to a new file. While it creates/writes data to disk, it does so in a reversible manner (the output can be deleted or overwritten). There is no data deletion, financial transaction, or code execution involved.
From the tool's definition The tool has a 'destination' parameter for saving output to a file path, creating a new raster file. This is a write operation that modifies the filesystem by creating or overwriting data at the specified destination path.
Documented attack patterns abuse exactly the kind of access weighted_band_sum gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and GIS MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for weighted_band_sum:
{
"version": "1",
"default": "deny",
"tools": {
"weighted_band_sum": {
"limits": [
{
"counter": "weighted_band_sum_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}weighted_band_sum stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Compute a weighted sum of all bands in a raster using specified weights. Parameters: - source: Path to the input multi-band raster file. - weights: List of weights (must match number of bands and sum to 1). - destination: Path to save the output single-band raster. It is categorised as a Write tool in the GIS MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the GIS MCP Server MCP server in PolicyLayer and add a rule for weighted_band_sum: 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 GIS MCP Server. Nothing to install.
weighted_band_sum 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 weighted_band_sum 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 weighted_band_sum. 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.
weighted_band_sum is provided by the GIS MCP Server MCP server (mahdin75/gis-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from GIS MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
98 GIS MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.