Compare function call structures across Git commits, branches, or working files to support code review. Display call trees and trace paths from an entry function to a target function, with support for 22 languages.
Diff call stacks across git commits for agentic code review (22 languages). Run `calldiff --help` for usage details.
Run score Not tested
See how to installReview the instructions the agent will receive before you install.
If the calldiff command is unavailable, install the latest version globally:
npm install -g calldiff@latest
Whenever showing calldiff output to the user, wrap it in a fenced diff code block so additions and removals receive colored syntax highlighting:
```diff
<calldiff output>
```
Diff call stacks between two git trees
| Name | Type | Required | Description |
|---|---|---|---|
from | string | no | Before ref (default: HEAD) |
to | string | no | After ref (default: working tree) |
paths | array | no | Limit to these path prefixes |
| Flag | Type | Default | Description |
|---|---|---|---|
--entry | unknown | ||
--maxDepth | number | 12 | Max call-tree depth |
--from | string | Left / "before" tree | |
--to | string | Right / "after" tree |
# HEAD vs working tree
calldiff diff
# One ref vs working tree
calldiff diff main
# Two commits / branches
calldiff diff abc123 def456
# Force entrypoints
calldiff diff main feature --entry createAgentSession
Semantics match git diff: no refs -> HEAD vs worktree; one ref -> that vs worktree; two refs -> compare those trees.
Find all call paths from an entrypoint to a target symbol
| Name | Type | Required | Description |
|---|---|---|---|
ref | string | no | Git ref (default: working tree) |
paths | array | no | Limit to these path prefixes |
| Flag | Type | Default | Description |
|---|---|---|---|
--entry | unknown | Entrypoint(s): functionName or ClassName.method | |
--to | string | Target symbol to reach (functionName or ClassName.method) | |
--maxDepth | number | 12 | Max call-tree depth |
# Paths in the working tree
calldiff reach --entry runCheckout --to sendEmail
# Paths at a commit, limited to a directory
calldiff reach HEAD examples/checkout --entry runCheckout --to sendEmail
View a call tree (no diff) for one or more entrypoints
| Name | Type | Required | Description |
|---|---|---|---|
ref | string | no | Git ref (default: working tree) |
paths | array | no | Limit to these path prefixes |
| Flag | Type | Default | Description |
|---|---|---|---|
--entry | unknown | Entrypoint(s): functionName or ClassName.method | |
--maxDepth | number | 12 | Max call-tree depth |
# Tree from working tree
calldiff tree --entry createAgentSession
# Tree from a commit
calldiff tree HEAD --entry PiService.createAgentSession
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