printr_open_web_signer

Accepts raw HTML/template content (payload)

Part of the Printr MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.

// WHEN AI AGENTS USE THIS TOOL

AI agents use printr_open_web_signer to create or modify resources in Printr. 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.

// WHY ENFORCE A POLICY ON PRINTR_OPEN_WEB_SIGNER

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

// RECOMMENDED POLICY

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

io-github-printrfi-printr.yaml

tools:
  printr_open_web_signer:
    rules:
      - action: allow
        rate_limit:
          max: 30
          window: 60

See the full Printr policy for all 25 tools.

// DETAILS

Tool Name printr_open_web_signer

Category Write

MCP Server Printr MCP Server

Risk Level Medium

// MORE PRINTR TOOLS

Financial printr_transfer Destructive printr_wallet_bulk_remove Destructive printr_wallet_remove Execute printr_drain_deployment_wallet Execute printr_fund_deployment_wallet Execute printr_launch_token Execute printr_wallet_new Write printr_create_token

View all 25 tools →

// WHAT CAN GO WRONG

Agents calling write-class tools like printr_open_web_signer have been implicated in these attack patterns. Read the full case and prevention policy for each:

Browse the full MCP Attack Database →

// OTHER WRITE TOOLS ACROSS MCP SERVERS

Other tools in the Write risk category across the catalogue. The same policy patterns (rate-limit, validate) apply to each.

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

// RELATED READING

// FAQ

What does the printr_open_web_signer tool do? +

Starts an ephemeral local signing session and returns a deep link to the Printr web app where the user can sign the transaction using their browser wallet (MetaMask / Phantom). Call this after printr_create_token when the user wants to sign via browser rather than providing a raw private key. Present the returned URL to the user and ask them to open it. After the user confirms they have signed, proceed to poll printr_get_deployments.. It is categorised as a Write tool in the Printr MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on printr_open_web_signer? +

Add a rule in your Intercept YAML policy under the tools section for printr_open_web_signer. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Printr MCP server.

What risk level is printr_open_web_signer? +

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

Can I rate-limit printr_open_web_signer? +

Yes. Add a rate_limit block to the printr_open_web_signer rule in your Intercept 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 printr_open_web_signer completely? +

Set action: deny in the Intercept policy for printr_open_web_signer. 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 printr_open_web_signer? +

printr_open_web_signer is provided by the Printr MCP server (@printr/mcp). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.

printr_open_web_signer

Let agents act without letting them run wild.