openapi-mcp-server

Provides a Spring Boot/WebMVC-based MCP server that exposes backend REST/OpenAPI-described APIs as MCP tools, with support for multiple sessions and pluggable authentication via a UserContextSetter.

Evaluated Apr 04, 2026 (16d ago)

Repo ↗ API Gateway mcp openapi swagger springboot mcp-server sse tool-calling java

⚙ 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

README demonstrates passing a bearer/JWT-like token in the client transport URL (SSEClientTransport URL). This can be risky if logs/proxies capture URLs. Scope granularity and authorization model are not described. TLS requirement is not stated in provided content. Dependency hygiene cannot be verified from provided text.

⚡ Reliability

Uptime/SLA

Version Stability

Breaking Changes

Error Recovery

Best When

You already have Spring MVC endpoints with OpenAPI docs and want to expose them as MCP tools quickly for AI clients.

Avoid When

You need clear operational contracts (SLA, error codes, retry/idempotency guarantees) or fine-grained auth/rate-limit policies documented in the package itself.

Use Cases

• Turn existing OpenAPI/Swagger-defined endpoints into MCP tools consumable by MCP clients (e.g., Cursor, Claude Desktop).
• Agent-driven back-office operations without building a custom agent UI layer.
• Rapid integration of Java/Spring backend capabilities into MCP-based AI workflows.

Not For

• Producing a fully managed hosted MCP service (it is a self-hosted server integration).
• Use cases requiring strong, well-specified enterprise auth/authorization models out of the box (README only suggests customization).
• Situations where robust rate-limit and retry semantics are required from documentation (not documented here).

Interface

REST API

Yes

GraphQL

gRPC

MCP Server

Yes

SDK

Webhooks

Authentication

Methods: Custom auth integration via UserContextSetter (example uses JWT token parsing to set UserContext)

OAuth: No Scopes: No

Authentication is described as 'support' and is configured by implementing UserContextSetter. README does not specify standardized auth schemes or scope model; it relies on user-provided JWT handling/custom interceptors.

Pricing

Free tier: No

Requires CC: No

No pricing information provided; appears to be a library/dependency to run your own server.

Agent Metadata

Pagination

none

Idempotent

False

Retry Guidance

Not documented

Known Gotchas

⚠ Client URL example embeds what looks like a token/query path; incorrect token handling may prevent session/tool access.
⚠ Multi-session support is mentioned but not shown with operational semantics (session lifecycle, limits, and concurrency).

Alternatives

Manually implement MCP tool handlers that call your REST APIs (custom MCP server). Use an MCP gateway that wraps OpenAPI/Swagger at runtime (if available in your ecosystem). Expose REST directly to the agent (without MCP) using your own tool-calling wrapper.

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API endpoint ↗ Agent guide ↗ Report inaccuracy

Scores are editorial opinions as of 2026-04-04.