cdktf provider add fails on CDKTF versions newer than 0.20.1

TL;DR

Pin the CDKTF CLI to 0.20.1 to generate providers: npm install -g cdktf-cli@0.20.1, run cdktf provider add, then upgrade the CLI back. The regression is version-specific.

The error

cdktf provider add fails on CDKTF versions newer than 0.20.1. On 0.20.1 it works:

[INFO] Adding local provider registry.terraform.io/grafana/grafana...
Generated typescript constructs in the output directory: src/gen

On newer versions it fails right after the "Adding local provider" line.

Fix it

1. Downgrade the CLI: npm install -g cdktf-cli@0.20.1.
2. Run cdktf provider add "[provider]" and confirm bindings generate.
3. Upgrade the CLI back to your version for synth/deploy; the generated bindings remain valid.
4. Alternatively, install a pre-built provider package (npm install @cdktf/provider-[name]) if one exists for your version.

Expected result: bindings generate under the configured output directory.

When to use this

• cdktf provider add worked on 0.20.1 and fails after upgrading the CLI
• The failure happens during local provider generation, not pre-built lookup

When NOT to use this

• The error is "Pre-built provider information not found" (different cause)
• You are on 0.20.1 already (something else is wrong)

Root cause

A regression in the provider code-generation path after 0.20.1 breaks local schema harvesting for some providers. The generated output itself is version-independent, so bindings produced by 0.20.1 work fine with newer CLI versions for synth and deploy.

Edge cases

• Keep the 0.20.1 CLI around (e.g. via npx) if you regenerate providers often.