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@github-actions github-actions released this 09 May 08:23
v0.19.0
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kostiantyn-matsebora
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Learn about vigilant mode.
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Learn about vigilant mode.

Added

  • PARALLEL block primitive — heterogeneous parallel-subagent fan-out as a real grammar element. PARALLEL takes no input and accepts ≥2 indented children; each child runs in its own context window. Defined in skills/canopy-runtime/references/framework-ops.md (mirrored to docs/reference/PRIMITIVES.md); platform emission rules in runtime-claude.md (multi-Task in one assistant turn) and runtime-copilot.md (fleet subtask / @CUSTOM-AGENT-NAME / sequential inline fallback). Failure semantics: Promise.allSettled — sibling failures don't abort. Backward-compatible: prose fan-out continues to work as the dynamic-shape escape hatch.

Changed

  • Authoring agent now recognizes PARALLEL as a structural target. /canopy improve flags prose-fan-out patterns and proposes PARALLEL-block migration alongside existing primitive-migration suggestions. /canopy convert-to-canopy maps "spawn N in parallel" prose to PARALLEL blocks during conversion. /canopy advise recommends PARALLEL when a skill has ≥2 sequential ## Agent invocations with no data dependency between them.
  • Marker-block updated in all framework sources (marker-block.md, install.sh, install.ps1) to list PARALLEL in the control-flow primitives. The vscode-extension mirror (claude-canopy-vscode/src/commands/installCanopy.ts) is updated separately in extension v0.12.0; parity check passes once both PRs land.
  • Spec narrative docs (CONCEPTS.md, FRAMEWORK_SPEC.md Tree Execution Model + Op Lookup Order) extended to enumerate PARALLEL alongside existing primitives.

Notes

  • This is the Tier 1 / S1 step from the parallel-subagent design ideation. S2 (## Agents + SPAWN per-subagent schema declarations) and S3 (PARALLEL_FOR_EACH data-parallel iterator) are deferred — escalate only if real skills demonstrate Tier 1 isn't enough.
  • No behavioral break: every existing skill continues to parse and run unchanged.

Verifying this release

# Verify the signed tag (uses GitHub's pubkey for SSH/GPG signatures)
git verify-tag v0.19.0

# Verify SLSA build provenance for the install tarball
gh attestation verify canopy-0.19.0.tar.gz --owner kostiantyn-matsebora
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