Render README.Rmd to README.md and update GitHub preview using devtools::build_readme().
Part of the R Packagedev server.
Free to start. No card required.
AI agents invoke build_readme to trigger processes or run actions in R Packagedev. 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.
build_readme 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": {
"build_readme": {
"limits": [
{
"counter": "build_readme_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}See the full R Packagedev policy for all 30 tools.
These attack patterns abuse exactly the kind of access build_readme 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.
Render README.Rmd to README.md and update GitHub preview using devtools::build_readme().. It is categorised as a Execute tool in the R Packagedev MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the R Packagedev MCP server in PolicyLayer and add a rule for build_readme: 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 R Packagedev. Nothing to install.
build_readme 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 build_readme 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 build_readme. 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.
build_readme is provided by the R Packagedev MCP server (r-packagedev-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 30 R Packagedev 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.