Anthropic

Generate messages with automatic PII and secrets protection using the Anthropic Messages API.

POST /anthropic/v1/messages

This endpoint supports both mask mode and route mode. Route mode requires a local LLM with Anthropic API support (e.g., Ollama). The request format follows the Anthropic Messages API.

Request

curl http://localhost:3000/anthropic/v1/messages \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-sonnet-4-6",
    "max_tokens": 1024,
    "messages": [
      {"role": "user", "content": "Hello"}
    ]
  }'

Parameters

Parameter	Type	Required	Description
`model`	string	Yes	Model ID (e.g., `claude-sonnet-4-6`)
`messages`	array	Yes	Conversation messages
`max_tokens`	number	Yes	Maximum tokens to generate
`stream`	boolean	No	Enable streaming
`system`	string/array	No	System prompt
`temperature`	number	No	Sampling temperature (0-1)

All Anthropic Messages API parameters are supported.

Response

{
  "id": "msg_abc123",
  "type": "message",
  "role": "assistant",
  "model": "claude-sonnet-4-6",
  "content": [
    {
      "type": "text",
      "text": "Hello! How can I help you today?"
    }
  ],
  "stop_reason": "end_turn",
  "usage": {
    "input_tokens": 10,
    "output_tokens": 15
  }
}

Streaming

Set stream: true for Server-Sent Events:

from anthropic import Anthropic

client = Anthropic(base_url="http://localhost:3000/anthropic")

with client.messages.stream(
    model="claude-sonnet-4-6",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Write a haiku"}]
) as stream:
    for text in stream.text_stream:
        print(text, end="")

import Anthropic from '@anthropic-ai/sdk';

const client = new Anthropic({
  baseURL: 'http://localhost:3000/anthropic'
});

const stream = client.messages.stream({
  model: 'claude-sonnet-4-6',
  max_tokens: 1024,
  messages: [{ role: 'user', content: 'Write a haiku' }]
});

for await (const event of stream) {
  if (event.type === 'content_block_delta' && event.delta.type === 'text_delta') {
    process.stdout.write(event.delta.text);
  }
}

Response Headers

PasteGuard adds headers to indicate PII and secrets handling:

Header	Description
`X-PasteGuard-Mode`	Current mode (`mask` or `route`)
`X-PasteGuard-Provider`	Provider used (`anthropic` or `local`)
`X-PasteGuard-PII-Detected`	`true` if PII was found
`X-PasteGuard-PII-Masked`	`true` if PII was masked (mask mode only)
`X-PasteGuard-Secrets-Detected`	`true` if secrets were found
`X-PasteGuard-Secrets-Types`	Comma-separated list of detected secret types
`X-PasteGuard-Secrets-Masked`	`true` if secrets were masked

Content Types

PasteGuard scans configured text roles in Anthropic requests. By default it scans:

User messages — String content or text blocks
Tool results — Text content in tool responses

Assistant messages and system prompts are available as scan roles, but are skipped by default. Add them to pii_detection.scan_roles or secrets_detection.scan_roles if you want PasteGuard to inspect them.

Getting Started

Use Cases

Concepts

API Reference

Configuration

Request

Parameters

Response

Streaming

Response Headers

Content Types

​Request

​Parameters

​Response

​Streaming

​Response Headers

​Content Types

Request

Parameters

Response

Streaming

Response Headers

Content Types