Enforce advertised Tool argument constraints - #955
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Set the existing protocol repair, safe-read replay, and model-visible Tool episode limits to ten while preserving their current independent state and execution semantics. Update focused tests and planning artifacts to make the off-by-one behavior explicit. Constraint: Tool-related retry and repair limits must be ten without restructuring the existing counters Rejected: Unify protocol, Receipt, and model-visible repair state now | counter redesign is intentionally deferred Confidence: high Scope-risk: moderate Directive: Keep the independent counters until the planned repair-control refactor; do not infer identical attempt semantics from the shared numeric limit Tested: 911 Runtime and Tool pytest cases; scoped Ruff; fatal-level caller Ruff; py_compile; git diff --check Not-tested: Live Provider credentials
The Runtime validator now enforces the JSON Schema keywords already used by production Tool definitions, so arguments rejected by the advertised contract cannot reach a handler. Failures remain bounded, value-free, and use the existing repairable Tool result path. Constraint: No new dependency and no attempt to implement the entire JSON Schema specification. Rejected: Add a general JSON Schema package | broader dependency and behavior change than required by the current Tool catalog. Confidence: high Scope-risk: moderate Directive: Add validator support when introducing a new schema keyword; unsupported schema contracts must not silently pass. Tested: 118 Runtime Tool validation, Tool Step, and builtin contract tests; scoped Ruff; git diff --check. Not-tested: Property-based comparison against a complete JSON Schema implementation.
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Summary
Validation
Boundaries