docs: worklog for agent update tests and bug fix
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docs/worklogs/2026-01-02-agent-update-tests-and-bug-fix.md
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docs/worklogs/2026-01-02-agent-update-tests-and-bug-fix.md
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---
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title: "Agent File Update Tests and Section Ordering Bug Fix"
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date: 2026-01-02
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keywords: [testing, bash, agent-context, bug-fix, state-machine, specify]
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commits: 1
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compression_status: uncompressed
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---
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# Session Summary
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**Date:** 2026-01-02
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**Focus Area:** Add comprehensive tests for agent file update logic and fix discovered bug
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# Accomplishments
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- [x] Created test-agent-update.sh with 33 test cases
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- [x] Discovered and fixed bug in update-agent-context.sh section ordering
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- [x] Tests cover: basic functionality, missing sections, timestamps, idempotency, change limits, DB entries, placement, edge cases
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- [x] Closed skills-hgm (Add tests for agent file update logic)
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- [x] Previous session: Completed skills-x33 (branch name tests - 27 tests)
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# Key Decisions
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## Decision 1: Test extraction approach using awk instead of sed
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- **Context:** Need to extract functions from update-agent-context.sh for isolated testing
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- **Options considered:**
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1. `sed -n '/^function()/,/^}$/p'` - Original approach
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2. `awk '/^function\(\)/,/^}$/ {print; if (/^}$/) exit}'` - More precise
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3. Source entire script with mocked dependencies
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- **Rationale:** awk with explicit exit on closing brace is more reliable for multi-function scripts
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- **Impact:** Clean function extraction without pulling in adjacent functions
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## Decision 2: Fix the bug rather than document as expected behavior
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- **Context:** Found that Recent Changes section was silently skipped when preceded by Active Technologies
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- **Rationale:** This was clearly unintended behavior - the code was supposed to update both sections
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- **Impact:** Agent context files now correctly receive change entries regardless of section ordering
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# Problems & Solutions
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| Problem | Solution | Learning |
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|---------|----------|----------|
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| eval/sed extraction didn't work correctly for update_existing_agent_file | Used awk with explicit exit on `^}$` pattern | awk is more precise for function boundary detection |
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| Tests failing: change entries not added to existing Recent Changes | Traced through code, found `## Recent Changes` caught by generic "close tech section on any ##" logic | State machine section handlers must check specific headers before generic patterns |
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| Idempotency test counting wrong pattern | Pattern "Python + Django" appeared in both tech and change sections | Use anchored regex `^- pattern$` for specific line matching |
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# Technical Details
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## Code Changes
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- Total files modified: 2
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- Key files changed:
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- `.specify/scripts/bash/update-agent-context.sh` - Fixed section ordering in while loop
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- `.specify/scripts/bash/tests/test-agent-update.sh` - New test file (33 tests)
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## The Bug
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The `update_existing_agent_file` function processes files line-by-line with a state machine. When in the Active Technologies section (`in_tech_section=true`), encountering any `##` header would:
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1. Add pending tech entries
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2. Echo the header line
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3. Set `in_tech_section=false`
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4. **Continue to next iteration** ← Bug here!
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This meant `## Recent Changes` was echoed but the change entry addition code (which checks `if [[ "$line" == "## Recent Changes" ]]`) was never reached.
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**Fix:** Check for `## Recent Changes` BEFORE the generic "any ## closes tech section" logic:
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```bash
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# Handle Recent Changes section FIRST (before generic ## handling)
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if [[ "$line" == "## Recent Changes" ]]; then
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# Close tech section if we were in it
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if [[ $in_tech_section == true ]]; then
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if [[ $tech_entries_added == false ]] && [[ ${#new_tech_entries[@]} -gt 0 ]]; then
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printf '%s\n' "${new_tech_entries[@]}" >> "$temp_file"
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tech_entries_added=true
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fi
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in_tech_section=false
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fi
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echo "$line" >> "$temp_file"
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# Add new change entry right after the heading
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if [[ -n "$new_change_entry" ]]; then
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echo "$new_change_entry" >> "$temp_file"
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fi
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...
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fi
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```
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## Test Categories
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1. **Basic Functionality** (4 tests) - Tech/change entries added, existing content preserved
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2. **Missing Sections** (6 tests) - Creates sections when absent
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3. **Timestamp Updates** (2 tests) - Updates `**Last updated**:` dates
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4. **Idempotency** (1 test) - No duplicates when re-running
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5. **Change Entry Limits** (5 tests) - Max 2 existing changes kept
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6. **Database Entries** (3 tests) - DB-only additions work
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7. **Tech Entry Placement** (3 tests) - Entries at correct position
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8. **Edge Cases** (5 tests) - Empty, NEEDS CLARIFICATION, EOF handling
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9. **format_technology_stack** (4 tests) - Helper function unit tests
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## Commands Used
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```bash
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# Run the tests
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bash .specify/scripts/bash/tests/test-agent-update.sh
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# Debug function extraction
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eval "$(awk '/^update_existing_agent_file\(\)/,/^}$/ {print; if (/^}$/) exit}' script.sh)"
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# Trace execution
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bash -x -c '...'
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```
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# Process and Workflow
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## What Worked Well
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- Test-first debugging: Writing tests exposed the bug immediately
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- Incremental tracing: Adding debug output to narrow down the issue
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- Hypothesis testing: Created minimal test cases to verify the bug cause
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## What Was Challenging
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- Function extraction: eval/sed patterns are finicky with nested braces
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- Understanding state machine flow: Had to trace through manually to find where `continue` was short-circuiting
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# Learning and Insights
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## Technical Insights
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- Bash state machines need careful ordering: specific cases before generic patterns
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- `continue` in while loops can silently skip subsequent handlers
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- Test fixtures with `setup_test_file()` using heredocs are clean for bash testing
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- grep patterns for line counting need anchoring to avoid false positives
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## Process Insights
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- When tests fail unexpectedly, the code might be buggy (not just the tests)
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- Adding debug output (`echo "DEBUG: ..." >&2`) is fast way to trace bash
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# Context for Future Work
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## Open Questions
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- Should we add more tests for create_new_agent_file function?
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- Consider shellcheck/shfmt for the test files?
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## Next Steps
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- skills-s92: Add tests for deploy-skill.sh (continues testing theme)
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- skills-7bu: Add atomic file operations (related to file update code)
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- Rebuild home-manager to deploy updated script
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## Related Work
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- [2026-01-01-ops-review-phase-3-and-worklog-migration.md](2026-01-01-ops-review-phase-3-and-worklog-migration.md) - Previous session
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- skills-x33: Branch name tests (27 tests, completed in prior session)
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# Raw Notes
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- The deployed worklog skill still uses .org format; repo has .md
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- Network issue prevented bd sync (192.168.1.108:3000 unreachable)
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- Total test count across both test files: 60 tests (27 branch + 33 agent)
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# Session Metrics
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- Commits made: 1
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- Files touched: 2
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- Lines added/removed: +536/-13
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- Tests added: 33
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- Tests passing: 33/33
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