Medium Risk

message_provider

Send a chat message into an existing Tewdy thread (typically created when a quote was submitted or accepted). The chat_id is the same id surfaced by get_my_requests or accept_quote. Requires authentication.

Part of the Tewdy server.

message_provider can modify Tewdy data, with no limits today. PolicyLayer puts allow, deny, and rate-limit rules on every call. Live in minutes.

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AI agents use message_provider to create or modify resources in Tewdy. 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 message_provider 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 Tewdy.

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

policy.json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "message_provider": {
      "limits": [
        {
          "counter": "message_provider_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

See the full Tewdy policy for all 11 tools.

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

Browse the full MCP Attack Database →

Every attack above starts with a tool call. PolicyLayer checks each one against your policy first, so message_provider only ever does what you allow.

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

What does the message_provider tool do? +

Send a chat message into an existing Tewdy thread (typically created when a quote was submitted or accepted). The chat_id is the same id surfaced by get_my_requests or accept_quote. Requires authentication.. It is categorised as a Write tool in the Tewdy MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on message_provider? +

Register the Tewdy MCP server in PolicyLayer and add a rule for message_provider: 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 Tewdy. Nothing to install.

What risk level is message_provider? +

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

Can I rate-limit message_provider? +

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

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

message_provider is provided by the Tewdy MCP server (https://mcp.tewdy.com). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Tewdy tool call.

Deterministic rules across all 11 Tewdy tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

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