Thanks for this fix, Atharva15007. Routing AST objects through processFile in addModelFiles, updateModelFile and validateModelFile looks correct. Existing ModelFile instances still pass through unchanged, and passing null definitions for AST input matches what addModel does. CI is green. To make this mergeable, please strengthen the tests so they would fail if the new branch did nothing (see the should-fix below). The other two points are small improvements.

Nothing blocking; some suggestions below. Findings: 1 should-fix, 2 nit.

• nit · tests · packages/concerto-core/test/astmodelmanager.js: Some assertions are weak. modelManager.getType(...).should.not.be.null can never fail because getType throws when a type is missing, and the .should.throw() in the update test has no error type or message (TypeNotFoundException would be more precise). In #addModelFiles, consider asserting the declarations are registered, e.g. getType('org.example.test1@1.0.0.Concept1'). A test that addModelFiles rolls back when a later AST is invalid would also be valuable, since the branch change affects every non-string input.
• nit · docs · packages/concerto-core/src/basemodelmanager.ts: The JSDoc @param types for validateModelFile, updateModelFile and addModelFiles still say string|ModelFile or string[]|ModelFile[], while the behaviour (and ModelFileInput) now also accepts an AST object. Please update them so the generated API docs match.

_{Automated review by Mira, an Accord Project agent, at 625cb08. Findings are labelled blocking, should-fix or nit; a maintainer makes the final call.}

Thanks for the update, Atharva15007. At this head addModelFiles, updateModelFile and validateModelFile accept AST objects as well as strings and ModelFile instances, passing null definitions for AST input. The earlier review points are addressed: the tests now assert on getType, check TypeNotFoundException with its message, cover rollback in addModelFiles, and the JSDoc is updated. I found nothing blocking. The one nit below is optional, and the change is otherwise ready for maintainer review.

Nothing blocking; some suggestions below. Findings: 1 nit.

_{Automated review by Mira, an Accord Project agent, at d5ef1d4. Findings are labelled blocking, should-fix or nit; a maintainer makes the final call.}