Read-only. Use before editing, verifying, or preparing publish for an existing workflow. Returns normalized draft and published workflow structure plus the Dreamlit preview/builder URL and status URLs. Do not use to create, update, publish, or unpublish workflows.
Part of the Dreamlit server.
Free to start. No card required.
AI agents call get_workflow_and_preview_url to retrieve information from Dreamlit without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though get_workflow_and_preview_url only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"get_workflow_and_preview_url": {}
}
}See the full Dreamlit policy for all 11 tools.
These attack patterns abuse exactly the kind of access get_workflow_and_preview_url gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Read-only. Use before editing, verifying, or preparing publish for an existing workflow. Returns normalized draft and published workflow structure plus the Dreamlit preview/builder URL and status URLs. Do not use to create, update, publish, or unpublish workflows.. It is categorised as a Read tool in the Dreamlit MCP Server, which means it retrieves data without modifying state.
Register the Dreamlit MCP server in PolicyLayer and add a rule for get_workflow_and_preview_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 Dreamlit. Nothing to install.
get_workflow_and_preview_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 get_workflow_and_preview_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 get_workflow_and_preview_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.
get_workflow_and_preview_url is provided by the Dreamlit MCP server (https://mcp.dreamlit.ai/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 11 Dreamlit tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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