fix(core,model-profiles): add missing ModelProfile fields, warn on schema drift

[Mason Daugherty (mdrxy)]

PR #35788 added 7 new fields to the langchain-profiles CLI output (name, status, release_date, last_updated, open_weights, attachment, temperature) but didn't update ModelProfile in langchain-core. Partner packages like langchain-aws that set extra="forbid" on their Pydantic models hit extra_forbidden validation errors when Pydantic encountered undeclared TypedDict keys at construction time. This adds the missing fields, makes ModelProfile forward-compatible, provides a base-class hook so partners can stop duplicating model-profile validator boilerplate, migrates all in-repo partners to the new hook, and adds runtime + CI-time warnings for schema drift.

Changes

langchain-core

• Add __pydantic_config__ = ConfigDict(extra="allow") to ModelProfile so unknown profile keys pass Pydantic validation even on models with extra="forbid" — forward-compatibility for when the CLI schema evolves ahead of core
• Declare the 7 missing fields on ModelProfile: name, status, release_date, last_updated, open_weights (metadata) and attachment, temperature (capabilities)
• Add _warn_unknown_profile_keys() in model_profile.py — emits a UserWarning when a profile dict contains keys not in ModelProfile, suggesting a core upgrade. Wrapped in a bare except so introspection failures never crash model construction
• Add BaseChatModel._resolve_model_profile() hook that returns None by default. Partners can override this single method instead of redefining the full _set_model_profile validator — the base validator calls it automatically
• Add BaseChatModel._check_profile_keys as a separate model_validator that calls _warn_unknown_profile_keys. Uses a distinct method name so partner overrides of _set_model_profile don't inadvertently suppress the check

langchain-profiles CLI

• Add _warn_undeclared_profile_keys() to the CLI (cli.py), called after merging augmentations in refresh() — warns at profile-generation time (not just runtime) when emitted keys aren't declared in ModelProfile. Gracefully skips if langchain-core isn't installed
• Add guard test test_model_data_to_profile_keys_subset_of_model_profile in model-profiles — feeds a fully-populated model dict to _model_data_to_profile() and asserts every emitted key exists in ModelProfile.__annotations__. CI fails before any release if someone adds a CLI field without updating the TypedDict

Partner packages

• Migrate all 10 in-repo partners to the _resolve_model_profile() hook, replacing duplicated @model_validator / _set_model_profile overrides: anthropic, deepseek, fireworks, groq, huggingface, mistralai, openai (base + azure), openrouter, perplexity, xai
• Anthropic retains custom logic (context-1m beta → max_input_tokens override); all others reduce to a one-liner
• Add pr_lint.yml scope for the new model-profiles package

[codspeed-hq]

Merging this PR will degrade performance by 65.01%

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 2 improved benchmarks
❌ 4 regressed benchmarks
✅ 19 untouched benchmarks
⏩ 15 skipped benchmarks¹

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	WallTime	test_async_callbacks_in_sync	20.5 ms	15.1 ms	+35.57%
❌	WallTime	test_init_time	2.8 ms	3.2 ms	-12.41%
❌	WallTime	test_init_time	2.8 ms	3.2 ms	-11.28%
⚡	WallTime	test_init_time	140.8 ms	124.8 ms	+12.85%
❌	Simulation	test_init_time	652.1 µs	1,863.5 µs	-65.01%
❌	Simulation	test_init_time_with_client	1.8 ms	3 ms	-39.87%

---

_{Comparing mdrxy/model-profiles/schema (337e788) with master (5ffece5)}

Footnotes

1. 15 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩