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feat(mcp): add stable machine-readable error details with retry hints - #1161
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Summary
Standardizes machine-readable MCP error details (
mindvault.error/v1) with explicitretryable,suggestedDelayMs, and secret-redacteduserMessagefields alongside existing error codes and categories.ErrorCodeSpecandERROR_CODESinmcp/src/errorCodes.tswithretryable: booleanandsuggestedDelayMs: number | nullaligned withretryclassification (MV_UNKNOWNandMV_PAYMENT_REJECTEDremain non-retryable by default withsuggestedDelayMs: null).retryHintFor(...)andsafeUserErrorMessage(...)helpers with boundedretryAfterMsoverride clamping (0..300_000ms) and secret redaction.ToolErrorPayload(toolErrorPayload) and updatesdocs/mcp-error-codes.mdanddocs/mcp-error-reference.md.Verification
pnpm --filter @mindvault/mcp exec vitest run src/errorCodes.test.ts src/errorMapping.test.ts src/paymentRetry.test.ts src/malformedResponse.test.ts(159/159 passed)Closes #1066