dagger-codegen
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
Install
mkdir -p .claude/skills/dagger-codegen && curl -L -o skill.zip "https://mcp.directory/api/skills/download/8018" && unzip -o skill.zip -d .claude/skills/dagger-codegen && rm skill.zipInstalls to .claude/skills/dagger-codegen
About this skill
Dagger Codegen
When to Load This Skill
- Editing
dagger.gen.goorinternal/dagger/dagger.gen.gooutput - Modifying Go templates in
cmd/codegen/generator/go/templates/ - Changing SDK interfaces in
core/sdk.go - Working on
dagger develop,dagger call, ordagger 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 |
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