[x] Name your Pull Request title clearly, concisely, and prefixed with the name of the primarily affected package you changed according to Good commit messages (such as memory: add interfaces for X, Y or util: add whizzbang helpers).
[x] Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
[x] Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. Fixes #123).
[x] Describes the source of new concepts.
[x] References existing implementations as appropriate.
The DefinedOutputParser prompted the LLM with a Typescript schema, but expected a json in response: https://github.com/tmc/langchaingo/blob/1975058648b5914fdd9dc53434c5b59f219e2b5c/outputparser/defined.go\#L65-69 Now it also requests a json.
PR Checklist
memory: add interfaces for X, Yorutil: add whizzbang helpers).Fixes #123).golangci-lintchecks.