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RationalBloks
io.github.rationalbloks/rationalbloks-mcp in the official MCP registry.
Endpoint https://mcp.rationalbloks.com/mcp. Source: github.com/rationalbloks/rationalbloks-mcp.
The registry describes it as: Deploy production REST APIs from JSON schemas in seconds. Manage projects, schemas, and deployments.
We read its 64 tools on 2026-10-26. Nothing in them matched our tool-poisoning rules. It also sets server instructions, text a client puts in front of the model on connect; those were read too.
A clean read means these rules found nothing, not that the server is harmless. A server can change its tools at any time, which is why the index reads it again every week.
Tools it advertises
list_projects get_project get_schema get_user_info list_clusters get_job_status list_project_jobs get_project_info get_version_history get_template_schemas get_schema_reference get_subscription_status get_project_usage get_project_storage_usage list_project_files get_schema_at_version preview_schema_change create_project update_schema patch_schema drop_schema_items deploy_staging deploy_production deploy_destructive redeploy_project delete_project rollback_project rename_project get_graph_schema get_graph_template_schemas get_graph_version_history get_graph_schema_at_version get_graph_project_info create_graph_project update_graph_schema deploy_graph_staging deploy_graph_production delete_graph_project rollback_graph_project create_graph_node get_graph_node list_graph_nodes update_graph_node delete_graph_node create_graph_relationship get_node_relationships delete_graph_relationship bulk_create_graph_nodes bulk_create_graph_relationships search_graph_nodes fulltext_search_graph traverse_graph get_graph_statistics get_graph_data_schema list_modules deploy_module redeploy_module update_module delete_module set_module_env and 4 more
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The badge reflects the latest weekly read: 
[](https://lazaretto.dev/mcp-registry/io-github-rationalbloks-rationalbloks-mcp)How this was checked
Lazaretto connects to the endpoint the way any MCP client does, asks the server to introduce itself and list its tools, and reads every name, description, parameter schema and server instruction for tool poisoning: hidden directive blocks, orders to read local secrets, parameters built to carry secrets or the conversation out, orders that redirect another server's tools, and invisible characters. It never calls a tool. What we found across the registry.
To run the same check every time Claude Code adds a server, install the free lazaretto-guard plugin. Browse every server in the index.