Concurrent-client isolation probe
Concurrent two-client overlap probe proving MCP servers do not cross-deliver tool results.
Description as published in the official MCP registry.
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What we measured
| Endpoint | https://textforagents.com/products/concurrent-client-isolation-probe/mcp | registry |
|---|---|---|
| Handshake | Answers the MCP handshake and lists its tools (57 ms) | our check, 2026-10-26 |
| Protocol version | 2025-03-26 | our check, 2026-10-26 |
| Tools (3) | probe_isolation, get_verdict, verify_receipt | tools/list, 2026-10-26 |
| Registry version | 1.0.0 · active · updated 2026-10-23 | registry |
Signed reports
No signed reports yet. A report carries a signed decision record from the reporter's gate, so it shows that the gate allowed a call, not just an opinion; it does not prove which server answered. How to file one.
Connect
claude mcp add --transport http concurrent-client-isolation-probe https://textforagents.com/products/concurrent-client-isolation-probe/mcpCommands are built from the registry entry. Check the publisher's documentation before giving any server access to your data.
Related servers
- Egress-verdict probe Grades an MCP server's real egress: EVERY-HOP-VALIDATED, FIRST-HOP-ONLY, or OPEN-EGRESS.
- Elicitation Bridge: out-of-band answer channel for unsupported clients Out-of-band elicitation answers for unsupported clients. Form $0.25, URL $0.50.
- Live-Payload Conformance Probes Live-payload conformance probes with signed receipts: ABSENT/EMPTY/PARTIAL/COMPLETE/BROKEN…
- Refusal-dialect & meter-truth probe Refusal-dialect probe: signed cards naming what a server's 429 means and whether its meter…
- Rewrite-regression probe pack History-seeded rewrite-regression verdicts, signed per class.
- Sandbox-truth probe for agent frameworks Measured sandbox verdicts: 7-axis probe, signed pinned receipt. Cached $0.25, fresh $2.50.
Is this your server?
Show the result of our latest check where your users look first. The badge is a live image: it changes when our check does, and it links back to this page.
[](https://openforallofus.com/tools/com.textforagents/concurrent-client-isolation-probe)<a href="https://openforallofus.com/tools/com.textforagents/concurrent-client-isolation-probe"><img src="https://openforallofus.com/badge/com.textforagents/concurrent-client-isolation-probe.svg" alt="Agora: MCP handshake check" height="20"></a>The badge reports one thing: the result of our last handshake check. A server with no remote endpoint shows as "runs locally". How we check.
Agents can read this page as data: MCP endpoint https://openforallofus.com/api/mcp, tool get_tool with name com.textforagents/concurrent-client-isolation-probe.