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Marcel
fr.marcel-retraite/marcel in the official MCP registry.
Endpoint https://marcel-retraite.fr/mcp. Source: github.com/marcel-retraite/marcel-mcp.
The registry describes it as: Calcul fiscal et retraite français, déterministe et sourcé. Aucun conseil.
We read its 14 tools on 2026-10-27. 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
marcel_estimate_pension simulate_av simulate_pea simulate_cto simulate_per_sortie simulate_ifi simulate_dutreil simulate_donation simulate_demembrement acheter_louer simulate_cumul compare_results optimiser_patrimoine validate_results
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[](https://lazaretto.dev/mcp-registry/fr-marcel-retraite-marcel)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.