## Summary
Toolkit version maps are keyed by **normalized (lowercase) slugs** on
the *write* side — env vars (`COMPOSIO_TOOLKIT_VERSION_*`) and
user-supplied dicts both get their keys lowercased when the map is
built. But the *lookup* read the map with the **raw slug**. A pin
configured under a different casing (e.g. `{ "GitHub": "20250101_00" }`
or `COMPOSIO_TOOLKIT_VERSION_GITHUB` looked up as `GitHub`) therefore
missed the map and silently fell back to `"latest"`, which
`Tools.execute` then rejects with a version-required error — discarding
the user's explicit pin.
Rather than patch only the read side, this **centralizes the
normalization rule** into a single helper per SDK and routes **both**
the map-building (write) and lookup (read) paths through it, so the two
sides can never drift apart again:
- **Python** — `normalize_toolkit_slug()` in
`python/composio/utils/toolkit_version.py`
- **TypeScript** — `normalizeToolkitSlug()` in
`ts/packages/core/src/utils/toolkitVersion.ts`, imported by
`getToolkitVersionsFromEnv` in `sdk.ts`
Behavior is now identical across the two SDKs. This **supersedes
#3759**, which patched only the Python read side and left TS diverging.
## Backend verification
Confirmed against the backend (staging, **1403 toolkits across 15
pages**): every toolkit `slug` is already lowercase (the mixed-case
`name` field is display-only). So the *primary* execute path — which
resolves via `tool.toolkit.slug` — was never broken in practice. This
change:
- **hardens** the direct-util and mixed-case-config paths (a user
passing `{ "GitHub": "…" }` now resolves as expected), and
- **removes a latent cross-SDK divergence**: the TS suite previously
asserted `getToolkitVersion` was *case-sensitive* (`versions.test.ts`),
locking in the bug for an input the production code path can't actually
produce. That test is flipped to assert case-insensitive resolution.
## Tests
- **Python** (`python/tests/test_toolkit_version.py`): case-insensitive
lookup via `get_toolkit_versions` round-trip, and against a raw
pre-normalized map. `18 passed`.
- **TypeScript** (`ts/packages/core/test/core/versions.test.ts`):
replaced the case-sensitivity assertion with case-insensitive resolution
+ a write→read round-trip of a mixed-case user pin. Full core suite `997
passed`.
- Typecheck (`tsc --noEmit`) clean; `ruff` clean.
## Notes
- Changeset added: `@composio/core` patch.
- No public API change; the fix is behavioral (case-insensitive) plus an
internal shared helper.
Alberto Schiabel