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This changelog tracks changes to the builder interface. Only changes that affect how you write skills, tools, memory, or responses are listed here. Internal runtime changes without builder-facing impact are omitted. Unreleased lists builder-facing changes that have landed but are not yet part of a tagged Maestro release. Older releases appear below as their own version sections. When Unreleased is empty it shows a short placeholder; once entries land they are grouped under typed subsections. Each version section starts with Breaking Changes when that subsection has entries — scan Breaking Changes first when upgrading.

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Unreleased

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Features

  • #6504: Skill instruction prose can reference live memory with @memory.project.<field> and @memory.<skill_id>.<field> (prompt substitution and train validation). Unreadable @memory refs, incomplete @memory lookalikes, and bare session.* in free prose fail train. See skill.md — Memory.

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3.19.0.dev4 - 2026-08-12

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Breaking Changes

  • #6401: Ordered-block steps now reject unknown YAML properties. The removed collect-step keys force_collection and tool: are no longer accepted — use ask_before_filling: true instead. The agent also fails to start when a skill directory cannot be parsed or when two skill directories in the same skills/ tree declare the same skill id.

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Improvements

  • #6428: Maestro projects without an endpoints.yml no longer log errors about the missing file when running CLI commands such as rasa train. Endpoint-backed tracing, metrics, and secrets configuration is skipped instead. CALM projects are unaffected.
  • #6423: Tools can read another skill’s public memory (and project.*) via fully-qualified names on context.memory.get, with the same visibility as conditions / read_all (private fields and deny_read still blocked). Writes stay scoped to the active skill and project.
  • #6401: Step and skill load validation now surfaces clearer, actionable error messages (including migration hints for the removed collect-step keys), and rasa data validate reports unloadable skill directories instead of relying on silent skips at runtime.
  • #6405: Langfuse tracing is configured under optional tracing: in integrations.yml (type: langfuse, ${VAR} keys, optional knobs such as environment and timeout). Example agents no longer rely on endpoints.yml for tracing; Langfuse declared only in endpoints.yml still works with a deprecation warning until you migrate the block.

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Documentation

  • #6423: The tools and memory.yml references document fully-qualified context.memory.get reads for sibling public fields.
  • #6401: The skill.md reference documents ordered-block step validation, the removed-key migration table, and collect-step authoring without per-step tool: overrides.