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Minimal MCP Server for tool calling codeflash with --file --function#653

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@aseembits93aseembits93 commentedAug 13, 2025•
edited by github-actionsbot
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PR Type

Enhancement

Description

  • Add asyncio client foroptimize_code tool

  • Implement MCP server withoptimize_code endpoint

  • ConfigureTestConfig andCoverageExpectation

  • Enable end-to-endrun_codeflash_command

Diagram Walkthrough

flowchart LR  client["MCP Client"] -- "call optimize_code" --> server["MCP Server"]  server -- "run_codeflash_command" --> codeflash["CodeFlash Command"]  codeflash -- "return result" --> client
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File Walkthrough

Relevant files
Enhancement
myclient.py
Add asyncio-based MCP client                                                         

myclient.py

  • Import and instantiateClient from fastmcp
  • Definecall_tool async function
  • Calloptimize_code tool and print result
  • Useasyncio.run for execution
+11/-0   
myserver.py
Implement MCP server tool optimize_code                                   

myserver.py

  • Import and instantiateFastMCP server
  • Decorateoptimize_code tool implementation
  • SetupTestConfig and coverage expectations
  • Invokerun_codeflash_command in tool
+29/-0   

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PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪
🧪 No relevant tests
🔒 No security concerns identified
⚡ Recommended focus areas for review

Hardcoded Path

The TestConfig uses an absolute file path which will not work on other environments; consider using thefile parameter to setfile_path dynamically or a relative path.

file_path=pathlib.Path("/Users/codeflash/Downloads/codeflash-dev/codeflash/code_to_optimize/bubble_sort.py"),
Undefined Variable

The inline print statement usesarr which isn't defined in this context, leading to a runtime error; ensure the correct variable is passed or captured.

cwd,config,100, ['print("codeflash stdout: Sorting list")','print(f"result: {arr}")']
Ignored Parameters

Theoptimize_code tool acceptsfile andfunction but currently ignores them in favor of hardcoded values; wire these parameters into the TestConfig instead.

defoptimize_code(file:str,function:str)->bool:#todo add file and function name as argumentsconfig=TestConfig(file_path=pathlib.Path("/Users/codeflash/Downloads/codeflash-dev/codeflash/code_to_optimize/bubble_sort.py"),function_name="sorter",test_framework="pytest",min_improvement_x=1.0,

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PR Code Suggestions ✨

Explore these optional code suggestions:

CategorySuggestion                                                                                                                                   Impact
Possible issue
Make TestConfig use parameters

Use thefile andfunction parameters to dynamically setfile_path andfunction_name
inTestConfig, and updatecoverage_expectations to reference the passed-in function.
This ensures the tool operates on the user-specified inputs rather than hardcoded
values.

myserver.py [12-22]

 config = TestConfig(-    file_path=pathlib.Path("/Users/codeflash/Downloads/codeflash-dev/codeflash/code_to_optimize/bubble_sort.py"),-    function_name="sorter",+    file_path=pathlib.Path(file),+    function_name=function,     test_framework="pytest",     min_improvement_x=1.0,     coverage_expectations=[         CoverageExpectation(-            function_name="sorter", expected_coverage=100.0, expected_lines=[2, 3, 4, 5, 6, 7, 8, 9, 10]+            function_name=function, expected_coverage=100.0, expected_lines=[2, 3, 4, 5, 6, 7, 8, 9, 10]         )     ], )
Suggestion importance[1-10]: 9

__

Why: The suggestion correctly replaces hardcodedfile_path andfunction_name with the passedfile andfunction parameters, ensuring dynamic behavior and preventing misuse of fixed values.

High
Fix undefined variable in prints

Remove or correct theprint(f"result: {arr}") statement sincearr is undefined,
which will cause a runtime error. Replace it with a valid variable or drop the
statement.

myserver.py [24-26]

 return run_codeflash_command(-    cwd, config, 100, ['print("codeflash stdout: Sorting list")', 'print(f"result: {arr}")']+    cwd, config, 100, ['print("codeflash stdout: Sorting list")'] )
Suggestion importance[1-10]: 7

__

Why: Removing the undefinedarr in the print list prevents a runtime NameError, addressing a clear bug in the call torun_codeflash_command.

Medium

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@aseembits93
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