Impact Analysis

chimera.training.impact analyzes the blast radius of changing a function or class. ImpactAnalyzer walks the codebase using AST to find callers, importers, and related tests for a given symbol.

Key Classes

ImpactReport

Dataclass summarising the impact of modifying a symbol.

Field	Type	Description
`symbol`	`str`	Name of the function/class being changed
`file_path`	`str`	File containing the symbol
`callers`	`list[CallerInfo]`	Functions that call the symbol
`importers`	`list[str]`	Files that import from this module
`tests`	`list[str]`	Test files that exercise this symbol

Key method: to_prompt_section() -> str — formats the report as a warning for the agent prompt.

ImpactAnalyzer

Walks all .py files under a working directory using AST analysis. No code execution — safe for any codebase.

Constructor: ImpactAnalyzer(workdir).

Key method: analyze(file_path, symbol_name) -> ImpactReport.

Usage

from chimera.training.impact import ImpactAnalyzer

analyzer = ImpactAnalyzer(workdir="./src")
report = analyzer.analyze("utils.py", "parse_config")

print(f"Symbol: {report.symbol}")
print(f"Callers: {len(report.callers)}")
print(f"Importers: {len(report.importers)}")
print(f"Related tests: {len(report.tests)}")

# Inject into agent prompt
prompt = "Fix the parse_config function." + report.to_prompt_section()
result = agent.run(prompt, env=env)

Fault Localization — find where bugs are
Mutation Testing — test suite quality analysis