curl --request GET \
--url https://api.reasonmachines.com/v3/organizations/{orgId}/reasons/{reasonId}/messages \
--header 'Authorization: Bearer <token>'import requests
url = "https://api.reasonmachines.com/v3/organizations/{orgId}/reasons/{reasonId}/messages"
headers = {"Authorization": "Bearer <token>"}
response = requests.get(url, headers=headers)
print(response.text)const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};
fetch('https://api.reasonmachines.com/v3/organizations/{orgId}/reasons/{reasonId}/messages', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://api.reasonmachines.com/v3/organizations/{orgId}/reasons/{reasonId}/messages",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "GET",
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"net/http"
"io"
)
func main() {
url := "https://api.reasonmachines.com/v3/organizations/{orgId}/reasons/{reasonId}/messages"
req, _ := http.NewRequest("GET", url, nil)
req.Header.Add("Authorization", "Bearer <token>")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.get("https://api.reasonmachines.com/v3/organizations/{orgId}/reasons/{reasonId}/messages")
.header("Authorization", "Bearer <token>")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.reasonmachines.com/v3/organizations/{orgId}/reasons/{reasonId}/messages")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Get.new(url)
request["Authorization"] = 'Bearer <token>'
response = http.request(request)
puts response.read_body{
"items": [
{
"id": "<string>",
"cursor": 123,
"kind": "prompt",
"role": "<string>",
"content": "<string>",
"status": "<string>",
"outcome": "success",
"metadata": {
"source": "subagent"
},
"attachments": [
{}
],
"created_at": "2023-11-07T05:31:56Z"
}
],
"has_next_page": true,
"end_cursor": "<string>",
"reason_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
"session_id": "<string>"
}{
"error": "missing_bearer",
"message": "Authorization required"
}{
"error": "missing_scope",
"required_scope": "sessions:read"
}{
"error": "session_not_found"
}{
"error": {
"type": "rate_limited",
"message": "This API key exceeded its request-rate limit"
}
}List a Reason's messages
Returns the Reason’s conversation in order, as listSessionConversation returns its conversation Session’s: the opening prompt, each message sent to it, and one reply for every finished turn, failed or cancelled turns included, with kind telling them apart. The page is empty, with session_id null, until the conversation is opened by its first message. Cursor-paginated: pass end_cursor as after, and keep polling with it to receive the Reason’s next reply. Readable by the Reason’s owner and the people it is shared with.
sessions:readcurl --request GET \
--url https://api.reasonmachines.com/v3/organizations/{orgId}/reasons/{reasonId}/messages \
--header 'Authorization: Bearer <token>'import requests
url = "https://api.reasonmachines.com/v3/organizations/{orgId}/reasons/{reasonId}/messages"
headers = {"Authorization": "Bearer <token>"}
response = requests.get(url, headers=headers)
print(response.text)const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};
fetch('https://api.reasonmachines.com/v3/organizations/{orgId}/reasons/{reasonId}/messages', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://api.reasonmachines.com/v3/organizations/{orgId}/reasons/{reasonId}/messages",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "GET",
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"net/http"
"io"
)
func main() {
url := "https://api.reasonmachines.com/v3/organizations/{orgId}/reasons/{reasonId}/messages"
req, _ := http.NewRequest("GET", url, nil)
req.Header.Add("Authorization", "Bearer <token>")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.get("https://api.reasonmachines.com/v3/organizations/{orgId}/reasons/{reasonId}/messages")
.header("Authorization", "Bearer <token>")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.reasonmachines.com/v3/organizations/{orgId}/reasons/{reasonId}/messages")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Get.new(url)
request["Authorization"] = 'Bearer <token>'
response = http.request(request)
puts response.read_body{
"items": [
{
"id": "<string>",
"cursor": 123,
"kind": "prompt",
"role": "<string>",
"content": "<string>",
"status": "<string>",
"outcome": "success",
"metadata": {
"source": "subagent"
},
"attachments": [
{}
],
"created_at": "2023-11-07T05:31:56Z"
}
],
"has_next_page": true,
"end_cursor": "<string>",
"reason_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
"session_id": "<string>"
}{
"error": "missing_bearer",
"message": "Authorization required"
}{
"error": "missing_scope",
"required_scope": "sessions:read"
}{
"error": "session_not_found"
}{
"error": {
"type": "rate_limited",
"message": "This API key exceeded its request-rate limit"
}
}Authorizations
Your Reason API key from Settings › API keys. New keys use reason_; legacy ara_ keys remain accepted. Keys are capability-scoped: run, mcp:read, mcp:write, secrets:read, secrets:write, sessions:read, sessions:debug, knowledge:read, memory:read, memory:write, skills:read, skills:write, repos:read, repos:write, reviews:read, reviews:write, deployment:read, analytics:read, org:read, org:write, attachments:read, attachments:write, guardrails:read, guardrails:write, network:read, network:write, automations:read, automations:write, agent_auth:read. network:read and network:write are opt-in, excluded from default keys. network:read reads the saved workspace network policy; network:write replaces custom allowed hosts and requires a current organization owner/admin. Legacy project PATCH requests containing network_allowed_hosts also require network:write plus their existing run scope and project management permission; saved project hosts do not affect current session egress. Only owners/admins can mint or manage keys with network:write; keys cannot grant themselves more authority. See /docs/network-policies for replacement semantics and runtime applicability. mcp:write manages MCP server configuration only; it does not authorize remote MCP-tool execution. sessions:read reads sessions, including the assistant, reasoning and tool activity in their events. sessions:debug is privileged: only for organization owners/admins, it expands session events to the full diagnostic projection (diagnostic event kinds, status text and raw event metadata).
Path Parameters
Organization id or slug. Resolve it with GET /v3/self.
The Reason id, returned as id by listReasons and createReason.
Query Parameters
How many conversation items one page holds, up to 200.
Cursor from a previous page's end_cursor (or an item's cursor): return only what follows it. Keep polling with the last end_cursor to receive the Reason's next replies.
Response
A page of the Reason's conversation.
Show child attributes
Show child attributes
The cursor of the last item, or the after that was sent when the page is empty; null only when nothing has been read. Keep polling with it after has_next_page is false to receive what is said next.
The Reason whose conversation this is.
The Reason's conversation Session; null, with no items, until its first message opens it.

