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The generate-changelog job in .github/workflows/tags.yaml previously checked out main and ran the AI agent there. The agent followed docs/agents/changelog.md, which instructed it to compute the release range with `git log <previous_version>..HEAD`. For minor releases (vX.Y.0) cut from main this happens to give the right answer; for patch releases (vX.Y.Z, Z>0) cut from a release-X.Y branch, HEAD-on- main is a strict superset of the release tag and contains commits that were merged to main both before and after the tag. The v1.3.1 changelog generated by this workflow (#2480) demonstrated the failure mode: it included 8 PRs merged to main but never shipped in v1.3.1, 6 backport PRs that landed on release-1.3 *after* v1.3.1 was tagged, both originals and their backports as separate entries, a hallucinated 2024 PR, and the cozystack-ci bot in the contributors list. The corrected v1.3.1 changelog contains the single fix that v1.3.1 actually ships. This PR fixes the root cause and tightens the agent guardrails: * tags.yaml: check out the release tag commit (`ref: ${{ steps.tag. outputs.tag }}`) instead of `main`, so HEAD == the release commit and `git log v<prev>..HEAD` corresponds to the actual release. The Create-changelog-branch step still creates the PR branch from origin/main, so PRs continue to merge cleanly into main. * tags.yaml: update the AI prompt to state explicitly that HEAD is the release commit and that the upper bound for the release range is the new tag, not main. * docs/agents/changelog.md: replace `..HEAD` with `..v<new_version>` in every example so the instruction is unambiguous regardless of which branch is checked out. * docs/agents/changelog.md: add a hard rule that backport PRs MUST be merged into the original entry (single line, two PR numbers), never listed as a second entry. Document the edge case where the original PR is outside the range — drop the entry. * docs/agents/changelog.md: forbid using the brief description verbatim as the detailed description, and forbid inventing entries for PRs that are not in the release range. * docs/agents/changelog.md: filter bot/CI accounts (`app/*`, `*[bot]`, cozystack-ci, github-actions, dependabot, renovate) out of the human Contributors list. Bot attribution on individual entries is still valid. The corresponding correction for the v1.3.1 changelog itself is in PR #2480 on the changelog-v1.3.1 branch. Signed-off-by: Myasnikov Daniil <myasnikovdaniil2001@gmail.com>