Changelog

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0.1.1 (2026-10-17)

  • Requires a2ui_core 0.1.1, which compiles on Elixir 1.17.

0.1.0 (2026-10-17)

First release.

  • Catalog registration, transformers (component and function pruning) and negotiation with a renderer's capabilities, inline catalogs included.
  • The direct JSON inference format: a prompt snippet with the negotiated catalogs' documents, the protocol schemas they use and few-shot examples, written as the reference SDKs write it, and a parser for complete and streamed responses that checks messages the way a renderer would.
  • The Express inference format (A2UIAgent.Express): a prompt with the notation's rules and the signatures of the negotiated catalogs' components and functions, a compiler from Express blocks to validated messages and a decompiler back, written as the reference SDKs write them.
  • Skills (A2UIAgent.Skill, A2UIAgent.SkillGenerator): a format's prompt packaged as one skill or as a core skill and one skill per catalog.
  • A component builder (A2UIAgent.Builder, with a function per basic component in A2UIAgent.Builder.Basic): trees flattened into component lists with the reference's id scheme, completed with the catalog's defaults and checked against it, and packaged as messages.
  • Macros (A2UIAgent.Macro, A2UIAgent.MacroExpander): components the model writes that expand into catalog components, an inference catalog that adds them to the base catalog, and their catalog schemas.
  • A2UIAgent.PayloadValidator, A2UIAgent.BlockLexer and A2UIAgent.PayloadFixer (the reference's parse_and_fix).
  • A2A: A2UI parts, extension negotiation, the message/send and message/stream methods (A2UIAgent.A2A.Server), and a plug that serves them over HTTP (A2UIAgent.A2A.Plug). A format that is not read chunk by chunk, such as Express, is answered once the output is complete.
  • MCP and AG-UI: the values an MCP server returns and reads for A2UI (A2UIAgent.MCP), and AG-UI activity snapshots, events and user actions (A2UIAgent.AGUI).
  • A2UIAgent.Builder.call/3 takes :catalog_id, for a call into another catalog (v1.0).
  • A2UIAgent.DirectJson.Parser.decompile/1 writes each message's keys in the protocol's order, so that decompiled text streams component by component.
  • Express, as in the Python SDK: a single data assignment to a nested path compiles to an update of that path; several assignments, or one to a top-level key, compile to one root update that merges them. A2UIAgent.Express.Parser.decompile/3 takes :surface_catalogs, for updates to surfaces created earlier.