Claude Platform Docs

Get chat messages

GET/v1/compliance/apps/chats/{claude_chat_id}/messages

Retrieves message history and file metadata for a specific chat.

Path parameters
claude_chat_id: string

The chat ID (tagged ID, e.g., claude_chat_abc123)

Query parameters
after_id: optional string

Pagination cursor for retrieving the next page of results. To paginate, pass the last_id value from the most recent response. Clients should treat this value as an opaque string and not attempt to parse or interpret its contents, as the format may change without notice.

before_id: optional string

Pagination cursor for retrieving the previous page of results. To paginate, pass the first_id value from the most recent response. Clients should treat this value as an opaque string and not attempt to parse or interpret its contents, as the format may change without notice.

created_at: optional object{ gt, gte, lt, lte }
gt: optional string

Filter messages created after this time (RFC 3339 format)

formatdate-time
gte: optional string

Filter messages created at or after this time (RFC 3339 format)

formatdate-time
lt: optional string

Filter messages created before this time (RFC 3339 format)

formatdate-time
lte: optional string

Filter messages created at or before this time (RFC 3339 format)

formatdate-time
limit: optional number

Maximum results (max: 1000). When omitted, the full result set is returned in one response.

maximum1000
minimum1
order: optional "asc" or "desc"

Sort direction for messages within the response. asc (the default) returns oldest-first; desc returns newest-first.

defaultasc
One of the following:
"asc"
"desc"
tool_result_max_chars: optional number

Maximum characters returned per tool-result text item. Items longer than this are shortened and the block's truncated field is set. Pass -1 to disable the limit.

default10000
minimum-1
tool_use_input_max_chars: optional number

Maximum characters of JSON-encoded tool input returned per tool_use block. Inputs longer than this are shortened and the block's truncated field is set. Pass -1 to disable the limit.

default10000
minimum-1
updated_at: optional object{ gt, gte, lt, lte }
gt: optional string

Filter messages updated after this time (RFC 3339 format)

formatdate-time
gte: optional string

Filter messages updated at or after this time (RFC 3339 format)

formatdate-time
lt: optional string

Filter messages updated before this time (RFC 3339 format)

formatdate-time
lte: optional string

Filter messages updated at or before this time (RFC 3339 format)

formatdate-time
Headers
"x-api-key": optional string
Returns
id: string

Chat ID

chat_messages: array of object{ id, artifacts, content, 4 more }

Array of chat messages in order of created_at

id: string

Unique identifier for the message e.g. 'claude_chat_msg_abcd1234'

artifacts: array of object{ id, artifact_type, title, version_id } or null

Versioned documents generated or updated by the assistant in this message. Download via GET /v1/compliance/apps/artifacts/{artifact_version_id}/content.

id: string

Artifact ID e.g. 'claude_artifact_abc123'

artifact_type: string or null

MIME-like artifact type e.g. 'application/vnd.ant.code'

title: string or null

Artifact title

version_id: string

Artifact version ID e.g. 'claude_artifact_version_abc123'

content: array of object{ text, thinking_redacted, truncated, type } or object{ id, input, integration_name, 4 more } or object{ content, integration_name, is_error, 5 more }

Content blocks within the message

One of the following:
Text object{ text, thinking_redacted, truncated, type }

Text content block.

text: string

Text content from human or assistant

thinking_redacted: boolean

True when content enclosed in the assistant's internal-reasoning tags (or the tag markup itself) was removed from text during export. Removal never occurs with this field false. Always false on human messages, whose text is exported verbatim.

defaultfalse
truncated: boolean

True when text was shortened by the server's fixed per-string bound (1 MiB). Always false on chat text blocks.

defaultfalse
type: "text"
defaulttext
ToolUse object{ id, input, integration_name, 4 more }

Tool invocation requested by the assistant.

id: string or null

Tool-use ID, e.g. 'toolu_01AbC...'

input: string

Arguments passed to the tool, as a JSON-encoded string. May be shortened — see the truncated field

integration_name: string or null

Name of the integration that provides this tool, when applicable

mcp_server_url: string or null

Base URL (scheme, host, and path only) of the MCP server that provides this tool, when applicable

name: string

Name of the tool invoked

truncated: boolean

True when input was shortened. Pass the endpoint's tool-use input max parameter as -1 to request full content, subject to any server-side maximum the endpoint enforces.

defaultfalse
type: "tool_use"
defaulttool_use
ToolResult object{ content, integration_name, is_error, 5 more }

Result returned by a tool invocation.

content: array of object{ text, type }

Text content returned by the tool. Generated files are surfaced via the message's generated_files list; other non-text item types (including images and links) are omitted.

text: string

Text returned by the tool

type: "text"
defaulttext
integration_name: string or null

Name of the integration that provides this tool, when applicable

is_error: boolean

True when the tool reported an error

mcp_server_url: string or null

Base URL (scheme, host, and path only) of the MCP server that provides this tool, when applicable

name: string

Name of the tool that produced this result

tool_use_id: string or null

ID of the tool_use block this result responds to

truncated: boolean

True when one or more text items in content were shortened. Pass the endpoint's tool-result max parameter as -1 to request full content, subject to any server-side maximum the endpoint enforces.

defaultfalse
type: "tool_result"
defaulttool_result
created_at: string

Message creation timestamp - For human: when they sent the message, For assistant: when it completed the last content block

formatdate-time
files: array of object{ id, created_at, filename, 3 more } or null

Binary file attachments uploaded by the user. Download via GET /v1/compliance/apps/chats/files/{claude_file_id}/content.

id: string

File ID

created_at: string

File creation timestamp

formatdate-time
filename: string

Display name of the file

md5: string or null

Lowercase hex MD5 of the file's preferred downloadable variant, as recorded at upload time. Null when no stored hash is available.

mime_type: string or null

MIME type of the file's preferred downloadable variant (e.g. 'application/pdf')

size_bytes: number or null

Size in bytes of the file's preferred downloadable variant, if known. Null for older files uploaded before size was recorded.

generated_files: array of object{ id, filename, md5, 2 more } or null

Downloadable files the assistant created via tool use (e.g. PDF, spreadsheet, slide deck). Distinct from files, which are uploads attached to the message. Download via GET /v1/compliance/apps/chats/generated-files/{claude_gen_file_id}/content.

id: string

Opaque generated-file id, e.g. 'claude_gen_file_abc123'. Treat as an opaque string; the encoding may change without notice.

filename: string

Display name of the generated file

md5: string or null

Lowercase hex MD5 of the generated file, when available. Null when no stored hash is available.

mime_type: string or null

MIME type reported by the tool that produced the file

size_bytes: number or null

Size in bytes of the generated file, when available. Null when the file has expired or size is not recorded.

role: "assistant" or "user"

Message sender (user or assistant)

One of the following:
"assistant"
"user"
created_at: string

Creation timestamp

formatdate-time
deleted_at: string or null

Deletion timestamp if deleted

formatdate-time
first_id: string or null

Opaque pagination cursor for the first message in the current result set. Pass as before_id on the next request to page backwards. Clients should treat this value as an opaque string and not attempt to parse or interpret its contents, as the format may change without notice.

has_more: boolean

Whether more chat messages exist beyond the current result set. Use last_id as after_id in a follow-up request to page forward.

defaultfalse
href: string

URL to view this chat in claude.ai

last_id: string or null

Opaque pagination cursor for the last message in the current result set. Pass as after_id on the next request to page forwards. Clients should treat this value as an opaque string and not attempt to parse or interpret its contents, as the format may change without notice.

model: string or null

Model selected for this chat (e.g. 'claude-opus-5'). May be null for legacy chats that never had a model recorded.

name: string

Chat name

organization_uuid: string

Organization UUID this chat belongs to

project_id: string or null

Project ID this chat belongs to

updated_at: string

Last update timestamp

formatdate-time
user: object{ id, email_address } or null

User information for compliance responses.

id: string

User identifier

email_address: string

User's email address

organization_id: string⁠Deprecated

Organization ID this chat belongs to

Get chat messages

cURL
curl https://api.anthropic.com/v1/compliance/apps/chats/$CLAUDE_CHAT_ID/messages \
    -H "Authorization: Bearer $ANTHROPIC_COMPLIANCE_API_KEY"
{
  "id": "claude_chat_abc123",
  "name": "Product Requirements Discussion",
  "created_at": "2025-06-07T08:09:10Z",
  "updated_at": "2025-06-07T08:09:11Z",
  "organization_id": "org_abc123",
  "organization_uuid": "abcdef01-2345-6789-abcd-ef0123456789",
  "project_id": "claude_proj_xyz789",
  "model": "claude-opus-5",
  "user": {
    "id": "user_xyz456",
    "email_address": "user@example.com"
  },
  "href": "https://claude.ai/chat/abcdef01-2345-6789-abcd-ef0123456789",
  "chat_messages": [
    {
      "id": "claude_chat_msg_abc123",
      "role": "user",
      "created_at": "2025-06-07T08:09:10Z",
      "content": [
        {
          "type": "text",
          "text": "Can you help me draft requirements for our new dashboard feature?"
        }
      ],
      "files": [
        {
          "id": "claude_file_xyz789",
          "filename": "dashboard_mockup_v1.pdf",
          "mime_type": "application/pdf",
          "size_bytes": 12345,
          "md5": "5d41402abc4b2a76b9719d911017c592",
          "created_at": "2025-06-07T08:09:10Z"
        }
      ]
    },
    {
      "id": "claude_chat_msg_def456",
      "role": "assistant",
      "created_at": "2025-06-07T08:09:11Z",
      "content": [
        {
          "type": "text",
          "text": "I'd be happy to help you draft requirements for your dashboard feature..."
        }
      ],
      "artifacts": [
        {
          "id": "claude_artifact_abc123",
          "version_id": "claude_artifact_version_xyz789",
          "title": "Dashboard Requirements Draft",
          "artifact_type": "text/markdown"
        }
      ]
    }
  ],
  "has_more": false,
  "first_id": "eyJtc2dfdXVpZCI6ICIwZjcwYjA2Ni0uLi4ifQ==",
  "last_id": "eyJtc2dfdXVpZCI6ICJhNGUwYjE3Mi0uLi4ifQ=="
}
Returns Examples
{
  "id": "claude_chat_abc123",
  "name": "Product Requirements Discussion",
  "created_at": "2025-06-07T08:09:10Z",
  "updated_at": "2025-06-07T08:09:11Z",
  "organization_id": "org_abc123",
  "organization_uuid": "abcdef01-2345-6789-abcd-ef0123456789",
  "project_id": "claude_proj_xyz789",
  "model": "claude-opus-5",
  "user": {
    "id": "user_xyz456",
    "email_address": "user@example.com"
  },
  "href": "https://claude.ai/chat/abcdef01-2345-6789-abcd-ef0123456789",
  "chat_messages": [
    {
      "id": "claude_chat_msg_abc123",
      "role": "user",
      "created_at": "2025-06-07T08:09:10Z",
      "content": [
        {
          "type": "text",
          "text": "Can you help me draft requirements for our new dashboard feature?"
        }
      ],
      "files": [
        {
          "id": "claude_file_xyz789",
          "filename": "dashboard_mockup_v1.pdf",
          "mime_type": "application/pdf",
          "size_bytes": 12345,
          "md5": "5d41402abc4b2a76b9719d911017c592",
          "created_at": "2025-06-07T08:09:10Z"
        }
      ]
    },
    {
      "id": "claude_chat_msg_def456",
      "role": "assistant",
      "created_at": "2025-06-07T08:09:11Z",
      "content": [
        {
          "type": "text",
          "text": "I'd be happy to help you draft requirements for your dashboard feature..."
        }
      ],
      "artifacts": [
        {
          "id": "claude_artifact_abc123",
          "version_id": "claude_artifact_version_xyz789",
          "title": "Dashboard Requirements Draft",
          "artifact_type": "text/markdown"
        }
      ]
    }
  ],
  "has_more": false,
  "first_id": "eyJtc2dfdXVpZCI6ICIwZjcwYjA2Ni0uLi4ifQ==",
  "last_id": "eyJtc2dfdXVpZCI6ICJhNGUwYjE3Mi0uLi4ifQ=="
}