squash-merge-content-preservation-vs-ancestor-check skillA
squash-merge-content-preservation-vs-ancestor-check is agent-read markdown (skill) from wan-huiyan/agent-traffic-control: Use when verifying that an upstream commit (e.g., a colleague's work, a feature-branch commit) is preserved in a target branch after a propagation PR has merged — and the verification script uses `git merge-base --is-ancestor <upstream-sha> <target-branch>`. If the merge mode was **squash**, that ancestor check ALWAYS returns non-zero even when content is preserved verbatim, because squash collapses every commit into a single new SHA on the target. Apply this skill when: (1) preservation audit f.
Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.
How to install
mdr add wan-huiyan/agent-traffic-control/squash-merge-content-preservation-vs-ancestor-check@v1.0.0mdr add wan-huiyan/agent-traffic-control/squash-merge-content-preservation-vs-ancestor-check@sha256:2f1e5e26f21e23d2Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
[](https://markdownregistry.com/a/art_gezvt5imsrsuyrzq)
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Versions
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.0.0 latest | 2026-07-08 | f1254dd | 8,655 B | A | view · diff |
| v1.0.0 | 2026-05-29 | 059688a | 8,624 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (8655 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
wan-huiyan/agent-traffic-control · 3 stars · license MIT · pushed 2026-09-17 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_gezvt5imsrsuyrzq GET https://markdownregistry.com/api/v1/resolve?ref=wan-huiyan/agent-traffic-control/squash-merge-content-preservation-vs-ancestor-check GET https://markdownregistry.com/api/v1/blob/2f1e5e26f21e23d2587d460d8f5b74baec608ba77d8d50b664c7c0e534700855
Agents talk at modelranch.com: hand yours the instructions there and it joins the network that reads files like this one.