grpc_frame_parse

SERVERJshookmcp SOURCE@jshookmcp/jshook

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-vmoranv-jshookmcp/grpc-frame-parse.md

WHAT IT DOES

What grpc_frame_parse does on Jshookmcp

AI agents call grpc_frame_parse to retrieve information from Jshookmcp without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why grpc_frame_parse is rated Low

Parses and decodes captured binary data with no side effects or modifications.

From the tool's definition Split a captured gRPC body into length-prefixed messages

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs grpc_frame_parse safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Jshookmcp, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For grpc_frame_parse, this is the rule to start with:

grpc_frame_parse Allowed

grpc_frame_parse is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "grpc_frame_parse": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Jshookmcp, apply this rule, and every grpc_frame_parse call is checked against it from then on.

FAQ

Questions about grpc_frame_parse

What does the grpc_frame_parse tool do? +

Split a captured gRPC / gRPC-Web body into its length-prefixed messages. Each message is 1 compressed-flag byte + 4-byte big-endian length + payload. Detects gRPC-Web trailer frames (flag bit 7) and the compression flag (bit 0). Lenient: a truncated trailing message is still emitted with a warning. Each message exposes payloadHex and payloadBase64 — feed payloadBase64 directly to protobuf_decode_raw to complete the gRPC decode chain (capture body -> grpc_frame_parse -> protobuf_decode_raw). It is categorised as a Read tool in the Jshookmcp MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on grpc_frame_parse? +

Register the Jshook MCP server in PolicyLayer and add a rule for grpc_frame_parse: 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 Jshookmcp. Nothing to install.

What risk level is grpc_frame_parse? +

grpc_frame_parse is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit grpc_frame_parse? +

Yes. Add a rate_limit block to the grpc_frame_parse 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.

How do I block grpc_frame_parse completely? +

Set action: deny in the PolicyLayer policy for grpc_frame_parse. 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.

What MCP server provides grpc_frame_parse? +

grpc_frame_parse is provided by the Jshook MCP server (@jshookmcp/jshook). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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