Engineering Method 0.3.1

Engineering Method 0.3.1

Released 2026-11-13. A maintenance release: every skill is now held to the
published skill authoring limits by a test.

Changes

• Syncs Method Core revision 4300085
  (70 files). It adds tests/test_skill_authoring.py, which checks each
  skills/*/SKILL.md: a name of at most 64 lowercase letters, digits and
  hyphens without a reserved word; a description of at most 1,024 characters in
  the third person without XML tags; portable frontmatter keys; a body under
  500 lines; forward slashes in links; and a contents list at the top of every
  reference file above 100 lines.
• Adds a contents list to shared/policies/lifecycle-handoffs.md and, through
  the core, to the Claude and Codex platform adapters.
• No skill name, description or behaviour changes. All 19 skills already met
  the name, description and length limits.

Verification and limits

The complete Python suite passes 347 tests on macOS. scripts/validate-plugin
and sync-core --check pass. The committed-source package is built twice for
reproducibility.

The test proves that the limits are kept. It does not measure whether a host
selects a skill for a plainly worded request. One unscripted probe on Claude
Code during this work loaded systematic-debugging for a failing test without
being told to, and loaded no specification skill for a new cross-module
feature request; that single run is an observation, not a rate. The paid native
routing and lifecycle evaluations were not rerun; the evidence limits of
0.3.0 remain.

The downloadable package is engineering-method-0.3.1.zip; verify it with the
attached SHA256SUMS.

Install or update

claude plugin marketplace update engineering-method
claude plugin update engineering-method@engineering-method

codex plugin remove engineering-method@engineering-method
codex plugin add engineering-method@engineering-method

Restart the host session afterwards. See
Installation and maintenance for a fixed-tag install and
OpenCode installation for the source-linked loader.