AI agents call snow_decode_url to retrieve information from Serac without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
snow_decode_url performs a local, reversible string decoding operation. It does not retrieve data from ServiceNow, modify any state, execute code beyond string transformation, delete anything, or move money. It is a utility for parsing URL-encoded strings, analogous to a simple text formatter.
From the tool's definition Tool description states 'URL-decode a percent-encoded string (decodeURIComponent). Local operation — no ServiceNow call.' This is a pure string transformation utility with no side effects, data retrieval, or external operations.
Attacks that exploit this kind of access
URL-decode a percent-encoded string (decodeURIComponent). Local operation — no ServiceNow call. Pair with snow_encode_url to round-trip query params. It is categorised as a Read tool in the Serac MCP Server, which means it retrieves data without modifying state.
Register the Serac MCP server in PolicyLayer and add a rule for snow_decode_url: 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 Serac. Nothing to install.
snow_decode_url 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 snow_decode_url 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 snow_decode_url. 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.
snow_decode_url is provided by the Serac MCP server (serac-labs/serac). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
snow_decode_url is one line of Serac's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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