dagger-codegen

Original：🇺🇸 English

Translated

Edit dagger.gen.go output, Go templates (object.go.tmpl, defs.go.tmpl), invoke() dispatch, SDK interfaces (CodeGenerator, ClientGenerator), `dagger develop`, `dagger client install`. Keywords: codegen, SDK, bindings, templates, internal/dagger, dag.*, ModuleMainSrc

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Sourcedagger/dagger

Added on2026-02-16

NPX Install

npx skill4agent add dagger/dagger dagger-codegen

SKILL.md Content

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Dagger Codegen

When to Load This Skill

Editing

dagger.gen.go

or

internal/dagger/dagger.gen.go

output

Modifying Go templates in
```
cmd/codegen/generator/go/templates/
```
Changing SDK interfaces in
```
core/sdk.go
```

Working on

dagger develop

,

dagger call

, or

dagger client install

Debugging why generated code looks wrong

Critical Concepts

"Codegen" means 4 different things in Dagger:

#	Name	Trigger	Key Files
1	In-Module Bindings	`dagger develop`	`cmd/codegen/generator/go/templates/`
2	Runtime Dispatch	Module startup	`cmd/codegen/generator/go/templates/modules.go:140`
3	SDK Libraries	`go generate`	`sdk/go/generate.go`
4	Generated Clients	`dagger client install`	`_dagger.gen.go/client.go.tmpl`

Know which one you're dealing with before editing.

Key Entry Points

To change...	Edit
Generated method signatures	`cmd/codegen/generator/go/templates/src/_types/object.go.tmpl`
Generated type definitions	`cmd/codegen/generator/go/templates/src/_types/*.go.tmpl`
Module `invoke()` dispatch	`cmd/codegen/generator/go/templates/modules.go:140`
Standalone client `Connect()`	`cmd/codegen/generator/go/templates/src/_dagger.gen.go/client.go.tmpl`
Template functions	`cmd/codegen/generator/go/templates/functions.go:54`
SDK interfaces	`core/sdk.go:20` (ClientGenerator), `:93` (CodeGenerator)
Built-in SDK list	`core/sdk/consts.go`
Python output	`sdk/python/codegen/src/codegen/generator.py`

Reference Files

Load based on specific need:

Need	Load
Understanding the 4 codegen types	codegen-types.md
SDK architecture, interfaces, Go special case	sdk-architecture.md
Go template conditionals, two-pass generation	go-templates.md
`dagger client install` internals	generated-clients.md