Security & Guardrails14.1ms Reflex$0 / Apache 2.0
21,800 active downloads
MCP Schema Validator
Edge JSON schema and parameter validator for Model Context Protocol servers
jevproxy // mcp-schema-validator (reflex kernel)
$npx jevproxy run mcp-validator
JevProxy Intercept Resolved(Mode: DIRECT_REFLEX)
14.1ms|Cost: $0.0001|0 reasoning tokens burned
STDOUT • Tool Call Output:Status: 200 OK
agent.dispatch(validate_mcp_call)
payload: { "tool_name": { "type": "string", "description": "Name of target MCP tool" }, "arguments": {...
✔ Decision short-circuited in 14.1ms without roundtrip to frontier LLM.
Upstream token bill saved: $0.0125 on this turn.
MCP Schema Validator
Compatible with Cursor, Claude Code, Windsurf, OpenCode
TRADITIONAL LLM CALL:UNOPTIMIZED
• Median Latency: 1180 ms
• Cost per Turn: $0.0125
• Mode: Full KV Cache Reload & TTFT Prefill
JEVPROXY REFLEX KERNEL:77x FASTER
• Median Latency: 14.1 ms
• Cost per Turn: $0.0001
• Accuracy: 100.0% deterministic
1-Click CLI Execution
Run this tool accelerated through the JevProxy gateway without manual wiring:
npx jevproxy run mcp-validatorOpenAI / Anthropic Tool Schema
JSON SpecificationPaste this schema into your agent tools definition or Cursor extensions:
{
"type": "function",
"function": {
"name": "validate_mcp_call",
"description": "Validate tool arguments against registered MCP tool definition",
"parameters": {
"type": "object",
"properties": {
"tool_name": {
"type": "string",
"description": "Name of target MCP tool"
},
"arguments": {
"type": "object",
"description": "Proposed parameter dictionary"
}
},
"required": [
"tool_name",
"arguments"
]
}
}
}Technical Architecture & Usage
Eliminating MCP Schema Drift
Model Context Protocol servers crash when models emit slightly malformed JSON. This tool validates and coerces types at the edge in 14.1ms.
Accelerate MCP Schema Validator with JevProxy
Get 5,000,000 free decision tokens. Eliminate the 3-second tool freeze in Cursor and Claude Code in under 60 seconds.