Build file index for fast searching
Risk signalsAccepts file system path (path)
Part of the Mcp Filesystem server.
Free to start. No card required.
AI agents invoke fs_build_index to trigger processes or run actions in Mcp Filesystem. Execute operations can have side effects beyond the immediate call -- triggering builds, sending notifications, or starting workflows. Rate limits and argument validation are essential to prevent runaway execution.
fs_build_index can trigger processes with real-world consequences. An uncontrolled agent might start dozens of builds, send mass notifications, or kick off expensive compute jobs. PolicyLayer enforces rate limits and validates arguments to keep execution within safe bounds.
Execute tools trigger processes. Rate-limit and validate arguments to prevent unintended side effects.
{
"version": "1",
"default": "deny",
"tools": {
"fs_build_index": {
"limits": [
{
"counter": "fs_build_index_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}See the full Mcp Filesystem policy for all 12 tools.
These attack patterns abuse exactly the kind of access fs_build_index gives an agent. Each links to the full case and the policy that stops it:
Other execute tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Build file index for fast searching. It is categorised as a Execute tool in the Mcp Filesystem MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Mcp Filesystem MCP server in PolicyLayer and add a rule for fs_build_index: 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 Filesystem. Nothing to install.
fs_build_index is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the fs_build_index 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 fs_build_index. 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.
fs_build_index is provided by the Mcp Filesystem MCP server (Digital-Defiance/ai-capabilities-suite). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 12 Mcp Filesystem tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.