perception_fetch_tile
Fetch the least-cloudy Sentinel-2 L2A tile covering a given H3 cell from Microsoft Planetary Computer. Returns signed COG band URLs for all 6 Prithvi/Clay spectral bands (B02 Blue, B03 Green, B04 Red, B8A NIR, B11 SWIR1, B12 SWIR2), plus tile metadata. The tile is cached in memory for subsequent ...
This record as markdown: /tools/com-geiant-mcp-agentcore/perception-fetch-tile.md
What perception_fetch_tile does on Mcp Agentcore
AI agents call perception_fetch_tile to retrieve information from Mcp Agentcore without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
h3_cell | string | Yes | H3 cell ID at any resolution. |
days_back | number | — | Days to search back. Default: 30. |
timestamp | string | — | ISO 8601 datetime. Search back from this point. Defaults to now. |
max_cloud_cover | number | — | Max cloud cover %. Default: 20. |
Parameters from the server's own tool schema.
Why perception_fetch_tile is rated Low
This tool retrieves satellite imagery data and metadata without side effects. It fetches pre-existing Sentinel-2 tiles and returns URLs and metadata for subsequent processing by other tools (perception_classify, perception_embed). There is no creation, modification, deletion, code execution, or financial transaction involved. The action is purely a data retrieval operation with no capacity to modify or destroy data.
From the tool's definition Tool description uses retrieval language: 'Fetch', 'Returns signed COG band URLs', 'cached in memory'. No modification, deletion, or execution of external operations mentioned.
Attacks that exploit this kind of access
The rule that runs perception_fetch_tile safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Mcp Agentcore, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For perception_fetch_tile, this is the rule to start with:
perception_fetch_tile is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Mcp Agentcore, apply this rule, and every perception_fetch_tile call is checked against it from then on.
Questions about perception_fetch_tile
Fetch the least-cloudy Sentinel-2 L2A tile covering a given H3 cell from Microsoft Planetary Computer. Returns signed COG band URLs for all 6 Prithvi/Clay spectral bands (B02 Blue, B03 Green, B04 Red, B8A NIR, B11 SWIR1, B12 SWIR2), plus tile metadata. The tile is cached in memory for subsequent perception_classify or perception_embed calls. It is categorised as a Read tool in the Mcp Agentcore MCP Server, which means it retrieves data without modifying state.
perception_fetch_tile accepts 4 parameters: h3_cell, days_back, timestamp, max_cloud_cover. Required: h3_cell. The full parameter table on this page comes from the server's own tool schema.
Register the Mcp Agentcore MCP server in PolicyLayer and add a rule for perception_fetch_tile: 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 Mcp Agentcore. Nothing to install.
perception_fetch_tile is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the perception_fetch_tile 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 perception_fetch_tile. 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.
perception_fetch_tile is provided by the Mcp Agentcore MCP server (https://packagesmcp-perception-production.up.railway.app/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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