fix: increase stdio buffer limit to prevent LimitOverrunError#2616
Merged
crivetimihai merged 1 commit intoIBM:mainfrom Jan 31, 2026
Merged
Conversation
279dfac to
1582568
Compare
Member
|
Thanks @jonathan-fulton! Good fix for the buffer overflow issue. 16MB is a reasonable limit for large tool responses like GitHub search results. I noticed there are a few other |
The default asyncio subprocess buffer limit (64KB) is too small for tools that return large responses (e.g., GitHub PR search results). This causes LimitOverrunError when the response exceeds the buffer size. Increase the buffer limit to 16MB to handle large tool responses reliably. Fixes IBM#2591 Signed-off-by: Jonathan Fulton <jonathan@jonathanfulton.com>
1582568 to
2bb8303
Compare
crivetimihai
approved these changes
Jan 31, 2026
hughhennelly
pushed a commit
to hughhennelly/mcp-context-forge
that referenced
this pull request
Feb 8, 2026
The default asyncio subprocess buffer limit (64KB) is too small for tools that return large responses (e.g., GitHub PR search results). This causes LimitOverrunError when the response exceeds the buffer size. Increase the buffer limit to 16MB to handle large tool responses reliably. Fixes IBM#2591 Signed-off-by: Jonathan Fulton <jonathan@jonathanfulton.com> Signed-off-by: hughhennnelly <hughhennelly06@gmail.com>
kcostell06
pushed a commit
to kcostell06/mcp-context-forge
that referenced
this pull request
Feb 24, 2026
The default asyncio subprocess buffer limit (64KB) is too small for tools that return large responses (e.g., GitHub PR search results). This causes LimitOverrunError when the response exceeds the buffer size. Increase the buffer limit to 16MB to handle large tool responses reliably. Fixes IBM#2591 Signed-off-by: Jonathan Fulton <jonathan@jonathanfulton.com>
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Summary
Increases the asyncio subprocess buffer limit from the default 64KB to 16MB to handle tools that return large responses.
Problem
When using
mcpgateway.translate(viacforge run) with tools that return large results, the bridge crashes withLimitOverrunError:This happens because the default asyncio buffer limit (64KB) is exceeded when tools return large amounts of data (e.g., GitHub search results).
Solution
STDIO_BUFFER_LIMITconstant set to 16MBasyncio.create_subprocess_exec()Testing
Tested with the GitHub MCP server running searches that return many results.
Fixes #2591