memory_generate_signature
Generate an update-resistant AOB (Array-of-Bytes) signature from bytes at a memory address. Detects relative offsets in CALL/JMP/LEA/Jcc instructions and replaces the displacement bytes with wildcards (??), making the signature survive minor code changes between updates. Uses byte-pattern heurist...
This record as markdown: /tools/io-github-vmoranv-jshookmcp/memory-generate-signature.md
What memory_generate_signature does on Jshookmcp
AI agents use memory_generate_signature to create or update resources in Jshookmcp, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Jshookmcp environment.
Why memory_generate_signature is rated Medium
An AI agent can call memory_generate_signature faster than any human can review: one bad instruction and it creates or modifies resources in Jshookmcp by the hundred, each call as confident as the last.
Attacks that exploit this kind of access
The rule that runs memory_generate_signature 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 memory_generate_signature, this is the rule to start with:
memory_generate_signature stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Jshookmcp, apply this rule, and every memory_generate_signature call is checked against it from then on.
Questions about memory_generate_signature
Generate an update-resistant AOB (Array-of-Bytes) signature from bytes at a memory address. Detects relative offsets in CALL/JMP/LEA/Jcc instructions and replaces the displacement bytes with wildcards (??), making the signature survive minor code changes between updates. Uses byte-pattern heuristics — no Capstone dependency required. It is categorised as a Write tool in the Jshookmcp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Jshook MCP server in PolicyLayer and add a rule for memory_generate_signature: 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.
memory_generate_signature is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the memory_generate_signature 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.
Set action: deny in the PolicyLayer policy for memory_generate_signature. 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.
memory_generate_signature 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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