dagger/dagger · error

failed to call sdk moduleTypes: %w

Error message

failed to call sdk moduleTypes: %w

What it means

This error wraps any failure from the dagql Select call that invokes the SDK runtime's `moduleTypes` field to build a container for generating module type definitions. It is thrown by the dagger engine's core/sdk package during `ModuleTypes`, the phase where a module's SDK runtime container is called to emit /module-typedefs.json. The underlying %w error carries the real cause (SDK function resolution, GraphQL field error, etc.).

Source

Thrown at core/sdk/module_typedefs.go:96

			Field: "moduleTypes",
			Args: []dagql.NamedInput{
				{
					Name:  "modSource",
					Value: dagql.NewID[*core.ModuleSource](sourceID),
				},
				{
					Name:  "introspectionJson",
					Value: dagql.NewID[*core.File](schemaJSONFileID),
				},
				{
					Name:  "outputFilePath",
					Value: dagql.NewString(moduleIDPath),
				},
			},
		},
	)
	if err != nil {
		return inst, fmt.Errorf("failed to call sdk moduleTypes: %w", err)
	}

	hideCtx := dagql.WithSkip(ctx)
	err = dag.Select(hideCtx, ctr, &ctr,
		dagql.Selector{
			Field: "withExec",
			Args: []dagql.NamedInput{
				{Name: "args", Value: dagql.ArrayInput[dagql.String]{}},
				{Name: "useEntrypoint", Value: dagql.NewBoolean(true)},
				{Name: "experimentalPrivilegedNesting", Value: dagql.NewBoolean(true)},
				{Name: "execMD", Value: dagql.NewDigestedSerializedString(&execMD, moduleTypesExecMDDigest)},
				{Name: "moduleContext", Value: dagql.Opt(moduleContextID)},
			},
		},
	)
	if err != nil {
		return inst, fmt.Errorf("failed to execute sdk moduleTypes container: %w", err)
	}

View on GitHub (pinned to 82ba2681db)

Solutions

1. Read the wrapped %w cause to find the real failure (SDK runtime error, image pull, invalid source).
2. Verify the module's source (dir/ref) is valid and reachable.
3. Upgrade the dagger CLI/engine and module SDK dependencies to matching versions.
4. Re-run with debug logging / telemetry to see the failing nested span.

// Go caller: ensure source and deps are valid before invoking module operations
if src == nil || deps == nil {
    return fmt.Errorf("module source and schema deps must be initialized before codegen")
}

inst, err := sdkInst.ModuleTypes(ctx, deps, source, mod)
if err != nil {
    var gqlErr * dagql.QueryError // inspect wrapped cause
    return fmt.Errorf("module sdk moduleTypes call failed: %w", err)
}

When it happens

Trigger: The dag.Select on sdkInst.sdk with Field "moduleTypes" (args modSource, introspectionJson, outputFilePath) returns an error — e.g. the SDK runtime image cannot be resolved, the sdk module failed to initialize, or the underlying GraphQL query errored.

Common situations: A module's SDK runtime (e.g. the Go/Python/TS SDK module) has a bug or incompatible version; the source repository or ref cannot be resolved; the engine cannot serve the introspection JSON ID; network failure pulling the SDK base image.

Related errors

• attach generated code directory: unexpected result %T
• apply changes to workspace root: %w
• namespace interface function id: %w
• namespace interface typedef id: %w
• persisted module source sdk does not implement code generato

AI-assisted analysis of dagger/dagger@82ba2681db (2026-09-05). Data as JSON: /api/errors/bbcf1ffcebc4c108. Report an issue: GitHub.