zod-contract-mock-forge-mcp MCP Server
MCP server for deterministic mock generation and API contract scaffolding using Zod schemas
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Status
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Connect
Published as zod-contract-mock-forge-mcp on npm. Runs locally.
Known issues
9 problems reported by people outside the maintainer team. Issues filed by the project's own owners, members and collaborators are excluded — those are release checklists and internal refactors, not things that will go wrong for you. Showing 6.
Most discussed
feat: add evaluate_schema_evolution tool
Problem
When a Zod schema is tightened — new required field added, string narrowed to enum, optional made required — existing static mocks in test fixtures and DB seed files silently become invalid. These only surface as confusing runtime failures deep in the test suite, long after the schema change was merged.
What the agent gains
Pre-flight breaking change detection that runs before tests. Identifies exactly which mocks are now invalid, the precise field path, and the expected vs rece
Read the thread · 2026-05-18 · closed · 0 comments
feat: add detect_schema_drift tool (Zod vs OpenAPI)
Problem
Teams maintaining both a Zod schema (runtime validation) and an OpenAPI spec (docs / client generation) inevitably let them diverge. Zod adds a required field — OpenAPI isn't updated. Result:
- AI agents reading docs hallucinate non-existent or incorrect payloads
- Downstream client generation breaks silently
- Integration tests pass locally but fail against the real API
This is called schema drift, and it's invisible until something breaks at runtime.
What the agent gains
Exp
Read the thread · 2026-05-18 · closed · 0 comments
feat: add generate_mock_variants tool for property-based testing
Problem
generate_valid_mock is deterministic — the same schema always produces the exact same output. This is valuable for snapshot tests, but property-based testing requires diverse valid inputs to surface edge cases that a single static payload misses.
Examples of edge cases only discoverable with varied mocks:
- Empty string passing
.min(1)check due to off-by-one in custom validator - Max-length strings triggering DB column overflow
- Random array lengths exposing pagination bugs
Read the thread · 2026-05-18 · closed · 0 comments
feat: add generate_exhaustive_union_violations tool
Problem
generate_boundary_violations currently tests only the first or last variant of union/discriminated union schemas. A z.discriminatedUnion with 5 branches leaves 3–4 branches completely untested. Common missed violations:
- Missing discriminator key
- Discriminator key with wrong literal value (no branch matches)
- Correct discriminator but type mismatch deep in a specific branch
What the agent gains
Total branch coverage for polymorphic schemas — every union variant gets tar
Read the thread · 2026-05-18 · closed · 0 comments
Add unit and integration tests for MCP server
Add tests for core logic like 'parseZodSchema' and integration tests for the MCP server using the SDK's testing utilities.
Read the thread · 2026-05-16 · closed · 0 comments
Most recent
Implement deep mutation for Boundary Violations
Currently, 'generate_boundary_violations' only handles top-level fields. We need to implement recursive mutation for nested objects and arrays, including constraints like .email(), .url(), etc.
Read the thread · 2026-05-16 · closed · 0 comments
See all 9 reports Pod holds for zod-contract-mock-forge-mcp.
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