SQLSpec DuckDB Adapter

Read .claude/skills/sqlspec_adapters/duckdb.md for Claude's adapter playbook and docs/guides/adapters/duckdb.md for project documentation.

Where to look

• Adapter implementation: sqlspec/adapters/duckdb/ (config.py, driver.py, _typing.py)
• Parameter profiles: sqlspec/core/parameters.py (duckdb profile + statement config helpers)
• Driver bases and mixins: sqlspec/driver/ and sqlspec/driver/mixins/
• Tests: tests/integration/test_adapters/test_duckdb/ and tests/integration/test_stack_edge_cases.py
• Claude and specs references: .claude/AGENTS.md, .claude/skills/README.md, specs/AGENTS.md, specs/guides/quality-gates.yaml

How it works

• Use config classes to map connection_config, driver_features, and statement config; register via SQLSpec.add_config().
• Override _connection_in_transaction() with direct attribute access (returns False; DuckDB requires explicit BEGIN and does not expose transaction state.).
• Flow parameter styles through StatementConfig from the driver profile; adapter guides describe defaults and overrides.
• Execute stacks with StatementStack using adapter-native pipeline when available, otherwise fall back to sequential execution.

Official References

• https://sqlspec.dev/
• https://sqlspec.dev/reference/adapters.html
• https://duckdb.org/docs/stable/clients/python/overview
• https://duckdb.org/docs/stable/sql/statements/transactions
• https://duckdb.org/docs/stable/sql/query_syntax/prepared_statements
• https://duckdb.org/news/

Shared Styleguide Baseline

• Use shared styleguides for generic language/framework rules to reduce duplication in this skill.
• General Principles
• SQLSpec
• Python
• Keep this skill focused on tool-specific workflows, edge cases, and integration details.