spring-projects / spring-projects/spring-ai
Stateless Async MCP Server with streamable-http returns only the first element from tools with a Flux return
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bug
mcp
- Dominant language
- Java
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- Avg merge
- 1d 7h
- Merged PRs (30d)
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Description
Bug description
It only returns the first value from the Flux.
Expected behavior
Return all values.
Minimal Complete Reproducible example
spring:
ai:
mcp:
server:
type: async
protocol: stateless
streamable-http:
mcp-endpoint: /mcp
public Flux<Object>> getSomething ...
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the stateless async streamable-http MCP server configuration with a tool returning a Flux. Trace the streamable-http handling for that tool and verify completion when all Flux elements, rather than only the first, are returned.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- java, spring
- Domain
- api, backend
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Quiet
- Clarity
- Mostly clear
- Newbie friendliness
- 48/100