Go "too many arguments in call" - Fix Signature Mismatches in CI

A function call passes the wrong number of arguments for the function’s signature. Most often a dependency upgrade changed a signature, and your call site was not updated to match.

What this error means

The build fails with too many arguments in call to <fn> or not enough arguments in call to <fn>, showing the expected and actual parameter lists. It is deterministic and points at the exact call.

go build output

./client.go:30:18: too many arguments in call to api.NewClient
	have (string, *Options, context.Context)
	want (string, *Options)

Common causes

A dependency changed a function signature

An upgraded module added, removed, or reordered parameters. An unpinned upgrade breaks every call site that used the old signature.

A local refactor not propagated to all callers

A function’s parameters changed but one or more call sites were missed, so they pass the wrong count.

How to fix it

Update the call to the new signature

Read the have/want lines to see the expected parameters.
Adjust the call site to match, consulting the dependency’s changelog/godoc for the new signature.
Run go build ./... to confirm all callers compile.

Pin the previous version if you cannot migrate yet

When the upgrade is unintended, pin back to the version whose signature your code expects.

Terminal

go get github.com/org/api@v1.4.0
go mod tidy

How to prevent it

Pin dependency versions and upgrade deliberately, reading changelogs.
Update every call site when changing a local function signature.
Build with go build ./... before merging.