Observed arrival · 2026-09-14

OpenPredicate, a shared grammar for search filters

openpredicate.tech Observed source

Editorial interest 86/100 Selection signal · not a rating of the site

An MIT-licensed JSON Schema that gives search APIs and agent tools a common, SQL-flavoured language for filtering records.

Landing page captured for the 2026-09-14 issue.

Field notes

The project encodes search filters as JSON under a JSON Schema draft 2020-12 grammar, allowing the same definition to be referenced from OpenAPI 3.1 or used as an MCP inputSchema. Its scope is deliberately limited to predicates, leaving projection, ordering, and pagination to individual APIs. The homepage documents implicit AND, scalar equality shorthand, and SQL-like UNKNOWN results for null or absent fields, with $unknownAs available when that behavior must be overridden.

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○OpenPublic substance visible

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

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