Changelog

Unreleased

Add explicit strict batch tool admission with opt-in schema quarantine at the ToolCatalog/Conversation boundary. Quarantine only removes direct :unsupported_capability schema results and returns accepted/rejected bundle diagnostics without changing execution-time argument validation.
Declare the optional jsonschex precision dependency so the standalone package runs the complete Draft 2020-12 numeric conformance suite.

Replace the hand-written schema subset with jsonschex 0.10.0, targeting JSON Schema Draft 2020-12 across the catalog preflight and execution gateway.
Add fixed-commit official Draft 2020-12 conformance coverage, explicit external schema registries/loaders, dialect/vocabulary checks, boolean and recursive references, and bounded schema/input resource handling.
Document format/content annotation defaults and the production dependency; the package is no longer dependency-free.

Accept the current MCP input-schema forms reported in issue #46: string annotations, numeric/string/array assertions, portable patterns, not, schema-valued additionalProperties, null and union types, untyped nested schemas, and scalar/array/null composition branches. Preserve recursive fail-closed preflight and argument validation before backend execution.

Support oneOf alongside object schema constraints at the tool root and in nested schemas while enforcing both the sibling constraints and exactly one matching branch. Catalog preflight remains recursive and fail-closed.

Accept JSON Schema default annotations at every supported schema position without inserting values or relaxing constraint validation.

Add atomic, run/incarnation-fenced Conversation tool catalog staging and post-batch publication with pinned provider definitions, exact duplicate reconciliation, and ephemeral registry/authority handling for issue #42.
Support typed JSON Schema enum constraints, including Sigma's todo action and status properties. Preserve type/constraint validation and fail-closed unsupported keywords; cover registration, provider dispatch, and rejected enum calls with regressions for issue #36.

Add a single-owner embedded conversation driver with lazy provider streams, authorized tools, steering/follow-up, hook and interaction adapters, finite deadlines and conservative cancellation/recovery. Existing command APIs remain.
Ship adapter documentation and a scripted embedded example; add artifact consumers and optional read-only real Sigma provider/schema verification.
Include this package in the existing gated Hex release workflow; no publication is performed by local verification.
Support Sigma's current built-in tool schema constraints, including numeric minimums, nested array items and oneOf composition.
Add an atomic durable-store incarnation fence and a reusable host-adapter conformance runner for commit, restart, recovery, and failure scenarios.