The new /speckit.retrospective command is not documented in README.md's "Available Slash Commands" section (around lines 247-270). Since this is a new command being added to the Spec-Driven Development workflow, it should be documented there. Based on its purpose (post-implementation analysis), it would fit best in the "Optional Commands" section alongside analyze and checklist, with a description like "Post-implementation retrospective analysis measuring spec drift and generating lessons learned".

The CHANGELOG.md should be updated to document the addition of the new /speckit.retrospective command. According to the AGENTS.md guidelines (line 15): "Any changes to init.py for the Specify CLI require a version rev in pyproject.toml and addition of entries to CHANGELOG.md." While this change doesn't modify init.py, it does add a significant new command to the toolkit that should be documented for users. The changelog should include a description of the new retrospective command and its purpose (spec drift analysis, lessons learned, etc.).

The user input consideration statement should use the stronger "You MUST consider" wording to be consistent with all other commands in the codebase. Every other command file (analyze.md, checklist.md, clarify.md, constitution.md, implement.md, plan.md, specify.md, tasks.md, taskstoissues.md) uses "You MUST consider the user input before proceeding (if not empty)." instead of just "Consider user input before proceeding (if not empty)."

The bash regex pattern '^\- \[[ Xx]\]' will match tasks in any state (unchecked [ ], checked [X], or [x]), which is correct for counting total tasks. However, the pattern should be '^- \[[ Xx]\]' (without backslash before the hyphen) as the hyphen doesn't need to be escaped at the beginning of the pattern. This is more consistent with standard grep patterns and avoids potential confusion.

Similarly, the pattern '^\- \[[Xx]\]' for completed tasks should be '^- \[[Xx]\]' without escaping the hyphen.

The division operation $((completed_tasks * 100 / total_tasks)) will fail with a "division by zero" error if there are no tasks in the file. While this is unlikely in normal usage (since tasks.md should have tasks), it's a potential edge case that should be handled. Consider adding a check or using a safer calculation approach.

The command states "abort if <50%" in line 32, but the detailed instruction in line 50 says "Confirm before proceeding" for <50% completion. These instructions are inconsistent. Based on the context and safer design (allowing users to proceed if they explicitly confirm), the "Confirm before proceeding" approach is more appropriate than an absolute abort, but the instructions should be consistent.

The git log command git log --name-only HEAD~50..HEAD assumes there are at least 50 commits in the repository history. In a new or small repository, this will fail with an error like "fatal: ambiguous argument 'HEAD~50': unknown revision or path not in the working tree." Consider using a safer approach like git log --name-only --since="1 month ago" or wrapping the command with error handling.

The table format appears incorrect. Line 127 shows "Total/Implemented/Modified/Not Implemented/Unspecified | X" which suggests multiple metrics crammed into a single row. This should likely be a multi-row table where each metric (Total, Implemented, Modified, Not Implemented, Unspecified) has its own row with a corresponding value, or it should be a multi-column table with separate columns for each metric type. The current format is unclear and won't render properly as a meaningful table.

Multiple tables in the report template are missing the required separator row between the header and content rows. According to Markdown table syntax, each table must have a separator row with dashes. The following tables are incomplete:

• Line 130: "Requirement Coverage Matrix" (missing separator like |--------|-------------|--------|-------|)
• Line 133: "Success Criteria Assessment" (missing separator)
• Line 136: "Architecture Drift" (missing separator)
• Line 150: "Innovations & Best Practices" (missing separator)
• Line 156: "Constitution Compliance" (missing separator)
• Line 160: "Analysis Effectiveness" (missing separator)
• Line 163: "Unspecified Implementations" (missing separator)
• Line 166: "Task Execution Analysis" (missing separator)
• Line 175: "Appendix: File Traceability" (missing separator)

Without these separator rows, the tables won't render correctly in most Markdown parsers.

The commit message format uses a dash separator "Spec adherence: X% | Completion: X%" but most of the codebase and conventional commit messages would use a colon after "Add retrospective analysis". Consider using "Add retrospective analysis: Spec adherence X%, Completion X%" or following conventional commit format like "feat(retrospective): add analysis report (adherence X%, completion X%)" for better git log readability and consistency.