// MCP TOOL REFERENCE

Medium Risk

hash_copy

Copy hash object

Free to start. No card required.

WHEN AGENTS USE THIS TOOL

AI agents use hash_copy to create or modify resources in Pypi:mcp Hashlib. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.

Without a policy, an AI agent could call hash_copy repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Pypi:mcp Hashlib.

RECOMMENDED POLICY

Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "hash_copy": {
      "limits": [
        {
          "counter": "hash_copy_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

See the full Pypi:mcp Hashlib policy for all 22 tools.

MORE PYPI:MCP HASHLIB TOOLS

Execute hash_new Write hash_update Read hash_blake2b Read hash_blake2s Read hash_file_digest Read hash_info Read hash_md5 Read hash_pbkdf2_hmac

View all 22 tools →

WHAT CAN GO WRONG

These attack patterns abuse exactly the kind of access hash_copy gives an agent. Each links to the full case and the policy that stops it:

Browse the full MCP Attack Database →

OTHER WRITE TOOLS

Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.

Firecrawl Web Scraping Server firecrawl_generate_llmstxt AbraFlexi contact_create AbraFlexi contact_update AbraFlexi evidence_create AbraFlexi evidence_update AbraFlexi invoice_issued_update

FAQ

What does the hash_copy tool do? +

Copy hash object. It is categorised as a Write tool in the Pypi:mcp Hashlib MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on hash_copy? +

Register the Pypi:mcp Hashlib MCP server in PolicyLayer and add a rule for hash_copy: 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 Pypi:mcp Hashlib. Nothing to install.

What risk level is hash_copy? +

hash_copy is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit hash_copy? +

Yes. Add a rate_limit block to the hash_copy 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 hash_copy completely? +

Set action: deny in the PolicyLayer policy for hash_copy. 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 hash_copy? +

hash_copy is provided by the Pypi:mcp Hashlib MCP server (pypi:mcp-hashlib). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Pypi:mcp Hashlib tool call.

Deterministic rules across all 22 Pypi:mcp Hashlib tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

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hash_copy

// WHEN AGENTS USE THIS TOOL

// RECOMMENDED POLICY

// MORE PYPI:MCP HASHLIB TOOLS

// WHAT CAN GO WRONG

// OTHER WRITE TOOLS

// RELATED READING

// FAQ