Extract a specific band from a multi-band raster and save it as a single-band GeoTIFF. Parameters: - source: path or URL of the input raster. - band_index: index of the band to extract (1-based). - destination: path to save the extracted band raster.
AI agents use extract_band 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 reads from a source raster and writes a new file to a destination path. It creates a new GeoTIFF file but does not modify or delete the original, making it a Write operation. Misuse could overwrite an existing file at the destination path, hence medium severity.
From the tool's definition Extract a specific band from a multi-band raster and save it as a single-band GeoTIFF
Documented attack patterns abuse exactly the kind of access extract_band 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 extract_band:
{
"version": "1",
"default": "deny",
"tools": {
"extract_band": {
"limits": [
{
"counter": "extract_band_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}extract_band 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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Extract a specific band from a multi-band raster and save it as a single-band GeoTIFF. Parameters: - source: path or URL of the input raster. - band_index: index of the band to extract (1-based). - destination: path to save the extracted 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 extract_band: 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.
extract_band 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 extract_band 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 extract_band. 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.
extract_band 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.