feat: strict tools for providers

[maksymbuleshnyi]

Note

Medium Risk
Changes how tool schemas are sent to multiple LLM providers when strict_tools is enabled; Cohere’s new extra_body injection and whitelist coercion could alter runtime behavior for agent tool calls.

Overview
Centralizes strict tool-calling JSON Schema transforms in new dynamiq/nodes/llms/_strict.py, with two shapes: OpenAI structured-outputs (all properties required, optionals as nullable unions, additionalProperties: false) and a required-omission subset (optional via required, free-form dict fields as JSON strings).

OpenAI, AzureAI, Cerebras, DeepSeek, and TogetherAI now mix in OpenAIStrictToolsMixin instead of duplicating OpenAI strict logic (large removal from openai.py). Anthropic drops its local schema cleaner and calls to_strict_subset_function. Cohere gains strict support: tightened schemas without per-tool strict, request-level strict_tools via extra_body, and a validator that coerces per-tool whitelists to full-request strict with a warning.

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[github-actions]

Coverage Report •

File	Stmts	Miss	Cover	Missing
dynamiq/nodes/llms
_strict.py	129	121	6%	50–61, 75–76, 78–87, 89–97, 102, 104, 107–109, 111–112, 117–118, 122–137, 154–157, 159–166, 168, 174–176, 178–180, 200–201, 203–207, 212–214, 217–218, 223–231, 234–236, 238, 242–247, 249–251, 253, 266–273, 293
anthropic.py	81	30	62%	33–35, 39–40, 44–45, 48, 51–58, 60–61, 115, 125–131, 138, 140, 142, 178
azureai.py	10	1	90%	29
cerebras.py	10	1	90%	25
cohere.py	28	14	50%	42–45, 50–51, 59–61, 70, 80–83
deepseek.py	10	1	90%	31
togetherai.py	10	1	90%	32
TOTAL	33335	9715	70%

Tests	Skipped	Failures	Errors	Time
2448	2 💤	0 ❌	0 🔥	2m 53s ⏱️

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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