open-im-server

Open-IM Server is an open-source instant messaging backend for developers, providing a microservices-based IM server with support for a gateway and multiple RPC services. It offers a REST API for business integrations (e.g., group creation/message pushing) and webhook callbacks around IM events, alongside an OpenIM SDK intended for client/application integration.

Evaluated Mar 29, 2026 (0d ago)

Homepage ↗ Repo ↗ Communication im chat messaging microservices rest-api webhooks go self-hosted

⚙ Agent Friendliness

/ 100

Can an agent use this?

🔒 Security

/ 100

Is it safe for agents?

⚡ Reliability

/ 100

Does it work consistently?

Score Breakdown

⚙ Agent Friendliness

MCP Quality

Documentation

Error Messages

Auth Simplicity

Rate Limits

🔒 Security

TLS Enforcement

Auth Strength

Scope Granularity

Dep. Hygiene

Secret Handling

Security posture cannot be confirmed from the provided README excerpt. TLS/auth specifics, secret-handling practices, and authorization scope granularity are not described here; treat integration as requiring careful review of server configuration and API auth implementation.

⚡ Reliability

Uptime/SLA

Version Stability

Breaking Changes

Error Recovery

Best When

You want to self-host or deploy an IM backend and integrate chat capabilities into your own services using the provided server APIs and SDKs.

Avoid When

You need a simple, minimal interface with clearly specified auth, rate limits, and OpenAPI details available directly in the top-level README excerpt.

Use Cases

• Embedding instant messaging features into developer applications
• Building group chat functionality and user/session management
• Integrating external business systems with IM events via REST APIs and webhooks
• Operating large-scale IM deployments (cluster mode, high message/user volume)

Not For

• A turnkey end-user chat app without backend development/integration
• Use cases requiring a fully documented, single cohesive third-party developer API surface based solely on the provided README excerpt

Interface

REST API

Yes

GraphQL

gRPC

Yes

MCP Server

SDK

Yes

Webhooks

Yes

Authentication

OAuth: No Scopes: No

The provided README excerpt mentions REST API and webhooks but does not describe authentication mechanisms, token types, or scopes.

Pricing

Free tier: No

Requires CC: No

Project is open-source; deployment/hosting costs depend on your infrastructure.

Agent Metadata

Pagination

none

Idempotent

False

Retry Guidance

Not documented

Known Gotchas

⚠ No MCP server in the provided materials (agent integration likely requires direct HTTP calls to REST/RPC endpoints).
⚠ Top-level README excerpt does not expose auth, error schema, rate-limit headers, pagination, or retry/idempotency guidance.

Alternatives

Stream Chat (managed chat) Sendbird (managed chat) Rocket.Chat (self-hosted chat server) Matrix homeserver (federated messaging)

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API endpoint ↗ Agent guide ↗ Report inaccuracy

Scores are editorial opinions as of 2026-03-29.