Connecting Devin AI to Fast.io Live WebSocket Event Feeds

Two coding agents pointed at the same repository will happily overwrite each other's work, and neither will notice. The fix is not a smarter agent, it is a shared place to put work where the second one can see what the first one did. When an autonomous developer agent like Devin AI operates on a complex codebase, it needs immediate visibility into repository and workspace changes. Ephemeral sandboxes can run test suites in isolation, but they remain blind to concurrent edits made by human teammates or other agents. Polling a REST API for updates introduces latency and risks hitting API rate limits. Instead, establishing a direct, full-duplex WebSocket connection between Devin AI's runtime environment and a persistent storage workspace allows the agent to react to file changes, metadata extractions, and permission updates instantly.

The WebSocket protocol provides full-duplex communication over a single TCP connection, allowing bidirectional, low-latency streaming between Devin and the workspace. When paired with Fast.io, the Fast.io websocket feed broadcasts uploads and permission changes instantly, enabling the agent to maintain an accurate, up-to-date model of the shared project workspace. This integration allows engineering teams to build automated feedback loops where Devin reacts immediately to human edits or uploads.

Without this persistent visibility, autonomous workflows suffer from synchronization gaps. For example, if a human developer uploads a new configuration file while Devin is mid-run, a polling-based agent might not fetch the update for several minutes. During that interval, the agent could generate code based on outdated assumptions, resulting in failed builds and wasted API usage. A real-time event pipeline eliminates this synchronization delay, ensuring that the agent's internal state remains perfectly aligned with the shared workspaces.

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To establish this integration, enterprise network administrators must configure firewall and proxy rules to allow Devin's outbound connections. In restricted network environments, Devin requires allowlisting for several specific domains to handle session rendering, API communication, and WebSocket handshakes.

To ensure proper functionality of Devin AI in restricted network environments, you must allowlist specific domains that handle core operations, including the API backend and the ACP (Agent Compute Platform) live WebSocket connection. Below are the required domains:

• api.devin.ai: Resolves to Devin's primary REST API backend. It handles authentication and establishes the Agent Compute Platform (ACP) live WebSocket connection.
• *.devinapps.com: Hosts the interactive session interfaces. User workstations must connect to this domain over HTTPS port 443 to load the VS Code editor frontend and the Desktop viewer panel.
• app.devin.ai: Renders the main web interface. Required for accessing organization settings, credentials, session dashboards, and downloading session logs.
• static.devin.ai: Serves static assets, installation scripts, and command-line interface utilities.
• *.codeiumdata.com & *.codeium.com: Facilitates Devin Desktop editor background services, code completions, and language server updates.
• googleapis.com & apis.google.com: Handles Google OAuth authentication flows for user identity verification.

Configuring these wildcard entries at the network boundary ensures that Devin can initialize its runtime environment and maintain its WebSocket connection without interruption. If an organization restricts wildcard allowlisting, admins must create specific rules for each active subdomain. However, because Devin dynamically provisions subdomains under devinapps.com for each session's interactive tools, using the wildcard pattern is highly recommended to prevent connection drops during active runs.

Devin establishes secure socket connections using the WebSocket Secure (wss://) protocol over port 443. The wss:// protocol ensures that traffic is encrypted in transit and can easily pass through most enterprise firewalls and network proxies without header corruption. Competitors overlook proxy configuration and specific domains needed for Devin's secure sockets, often leading to connection failures where the agent's IDE or terminal hangs indefinitely.

If your organization requires a manual proxy configuration, you can manage these settings directly within the Devin Desktop application:

1. Open the Devin Settings menu via the top-right settings dropdown or by opening the Command Palette (using Ctrl/⌘ + Shift + P) and searching for 'Open Devin User Settings'.
2. If your local machine uses a system proxy or PAC file, toggle the 'Detect proxy' option to ON and restart the editor to inherit network properties automatically.
3. If automatic detection fails, manually enter your corporate proxy host address, port, and credentials in the designated inputs.
4. Work with your network team to ensure that the corporate proxy is configured to allow outbound secure WebSocket traffic over port 443 to the allowlisted domains without decrypting or inspecting SSL certificates, which can cause connection handshakes to fail.

A common failure mode in corporate environments is SSL interception, where a proxy terminates the SSL connection, inspects the payload, and re-encrypts it using a custom root certificate authority (CA). While this works for standard web traffic, it breaks the secure WebSocket connection between Devin and the Cognition platform unless the custom CA certificate is explicitly trusted by Devin's runtime sandbox. To avoid this, configure a bypass rule at the corporate firewall for all *.devin.ai and *.devinapps.com traffic, allowing secure WebSocket connections to pass through untampered.

Stream Fast.io Workspace Events directly to Devin AI

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With the network rules in place, Devin can connect to Fast.io's events. Fast.io provides a live event stream via a WebSocket activity feed or a long-poll API endpoint. Because there is no Fast.io SDK, developers connect agents to Fast.io using standard HTTP or the Model Context Protocol (MCP). Fast.io is an intelligent workspace that exposes action-based MCP tools via Streamable HTTP at /mcp (or legacy SSE at /sse for Direct Model Context Protocol access), giving Devin native read and write access to workspace files. To learn more about configuration options, developers can review the agent storage documentation.

To consume file event updates programmatically, an agent or a background daemon can poll the workspace activity endpoint. The REST API lives at https://api.fast.io/current/ and all routes end in a slash. The long-poll route is: GET /current/activity/poll/{entity_id}/

Below is a Python implementation showing how to poll the Fast.io workspace activity endpoint to detect new uploads and pass them to Devin:

import time
import requests

API_BASE_URL = "https://api.fast.io/current"
WORKSPACE_ID = "ws_devin_collaboration_01"
API_KEY = "fast_api_key_example"

headers = {
    "Authorization": f"Bearer {API_KEY}",
    "Content-Type": "application/json"
}

def monitor_workspace_changes():
    last_timestamp = int(time.time() * 1000)
    print(f"Monitoring Fast.io workspace {WORKSPACE_ID}...")
    
    while True:
        try:
            poll_url = f"{API_BASE_URL}/activity/poll/{WORKSPACE_ID}/?wait=95&lastactivity={last_timestamp}"
            response = requests.get(poll_url, headers=headers, timeout=100)
            
            if response.status_code == 200:
                data = response.json()
                events = data.get("events", [])
                
                for event in events:
                    event_type = event.get("type")
                    file_name = event.get("name")
                    print(f"Detected event: {event_type} on file {file_name}")
                    
                last_timestamp = data.get("timestamp", last_timestamp)
                
            elif response.status_code == 404:
                print("Workspace not found. Check your workspace ID.")
                break
            else:
                print(f"Unexpected status code: {response.status_code}. Retrying in 10 seconds...")
                time.sleep(10)
                
        except requests.exceptions.RequestException as e:
            print(f"Connection error: {e}. Reconnecting...")
            time.sleep(5)

if __name__ == "__main__":
    monitor_workspace_changes()

When Devin detects a new file upload through the poll feed, it can invoke Fast.io's MCP tools to read the file or run structured extraction tasks using Metadata Views. For example, if a team member uploads a document containing software specifications, Fast.io automatically indexes the document on arrival. Devin can perform a semantic search query against the workspace, retrieve the relevant chunks with citations, and begin drafting the corresponding code immediately.

Fast.io workspaces are shared substrates designed for human-agent collaboration. The workspace environment includes per-file version history, ensuring that if Devin and a human developer edit the same file concurrently, no changes are lost and previous versions can be restored. All actions taken by Devin or team members are recorded in the append-only audit log, providing complete visibility into who modified or read workspace files.

When Devin completes its assigned programming tasks, the handoff is straightforward. Devin can create project folders, commit code changes to Git, upload output artifacts to the workspace, and then initiate an ownership transfer. This transfers the organization ownership to a human manager while allowing the agent to retain admin access under human supervision. This separation of concerns allows human administrators to maintain complete control over billing, billing details, and workspace configurations while Devin continues to execute maintenance runs in the background.

Fast.io plans are structured to scale with team and agent operations: the Starter plan is priced at $9.99/mo, the Business plan at $49.99/mo, and the Enterprise plan at $199.99/mo. Every organization begins with a 14-day free trial, which requires a credit card. Teams can configure their workspaces, connect Devin to the MCP server, and test the real-time event feeds during this trial period before any billing occurs. Details are available on the pricing page and agent storage overview. This trial environment provides the necessary resources to validate the integration, test the domain allowlists, and establish stable connection paths for autonomous agent workflows.