write-bug-report — workgraph

Metadata

Status	done
Assigned	`agent-573`
Agent identity	`ead7f53029b7d01980e12f8beb6ad13f6907750479eb2951dd75eb63951922b8`
Created	2026-04-02T19:11:48.170854588+00:00
Started	2026-04-02T19:12:17.170713346+00:00
Completed	2026-04-02T19:13:20.014364356+00:00
Tags	`bug-report,meta`, `eval-scheduled`
Eval score	0.90
└ blocking impact	0.90
└ completeness	0.95
└ coordination overhead	0.88
└ correctness	0.92
└ downstream usability	0.90
└ efficiency	0.88
└ intent fidelity	0.78
└ style adherence	0.90

Description

CRITICAL CONTEXT

PHR = Pseudohomologous Region.

Goal

Write a markdown file at wg_evolve_yaml_bug_report.md describing the bug we encountered and how it was resolved. Do NOT commit it to git.

What happened

The Bug

wg evolve run failed with:

Error: Failed to load roles
Caused by:
    YAML error: could not find expected ':' at line 46 column 1, while scanning a simple key at line 45 column 1

Root cause

A corrupted YAML cache file in .workgraph/agency/cache/roles/ had a malformed timestamp split across two lines. The file appeared valid individually but when the YAML loader parsed it, the split timestamp created a parse error at the line boundary.

How it was found

User asked to run wg evolve run to improve agency performance after ~450 task completions
The command immediately failed with the YAML error
Investigation showed 8 role cache files in .workgraph/agency/cache/roles/
Each file was 20-50 lines, but the error referenced line 46 — pointing to a multi-file or corrupted-line issue
Agent (agent-544 on task bug-report-wg) found the specific corrupted file with a timestamp split across lines 44-45

Resolution

Agent fixed the corrupted YAML file in place. After the fix, wg evolve run executed successfully, running two evolution cycles:

run-20260402-150503
run-20260402-150803

The evolution applied 20 of 24 operations: 4 new roles, 5 new motivations, 3 modified motivations, 2 coordinator prompt updates, 3 new agents. 4 operations failed due to tool-level limitations (missing fields in bizarre_ideation, unsupported entity_type).

Recommendations

YAML write validation: When writing role cache files, validate the YAML is parseable before committing to disk
Graceful degradation: If one role file is corrupted, skip it and warn rather than failing the entire evolve run
Cache rebuild: Provide a wg evolve repair or wg agency repair command to rebuild corrupted cache files from source primitives

File format

Write this as a clean markdown document. Keep it concise — 1-2 pages max. Include the error message, root cause, resolution, and recommendations.

Validation

File exists at wg_evolve_yaml_bug_report.md
File is NOT committed to git
Content covers the bug, cause, fix, and recommendations

## CRITICAL CONTEXT
**PHR = Pseudohomologous Region.**

## Goal
Write a markdown file at `wg_evolve_yaml_bug_report.md` describing the bug we encountered and how it was resolved. Do NOT commit it to git.

## What happened

### The Bug
`wg evolve run` failed with:
```
Error: Failed to load roles
Caused by:
YAML error: could not find expected ':' at line 46 column 1, while scanning a simple key at line 45 column 1
```

### Root cause
A corrupted YAML cache file in `.workgraph/agency/cache/roles/` had a malformed timestamp split across two lines. The file appeared valid individually but when the YAML loader parsed it, the split timestamp created a parse error at the line boundary.

### How it was found
- User asked to run `wg evolve run` to improve agency performance after ~450 task completions
- The command immediately failed with the YAML error
- Investigation showed 8 role cache files in `.workgraph/agency/cache/roles/`
- Each file was 20-50 lines, but the error referenced line 46 — pointing to a multi-file or corrupted-line issue
- Agent (agent-544 on task bug-report-wg) found the specific corrupted file with a timestamp split across lines 44-45

### Resolution
Agent fixed the corrupted YAML file in place. After the fix, `wg evolve run` executed successfully, running two evolution cycles:
- run-20260402-150503
- run-20260402-150803

### Recommendations
1. **YAML write validation**: When writing role cache files, validate the YAML is parseable before committing to disk
2. **Graceful degradation**: If one role file is corrupted, skip it and warn rather than failing the entire evolve run
3. **Cache rebuild**: Provide a `wg evolve repair` or `wg agency repair` command to rebuild corrupted cache files from source primitives

## File format
Write this as a clean markdown document. Keep it concise — 1-2 pages max. Include the error message, root cause, resolution, and recommendations.

## Validation
- File exists at `wg_evolve_yaml_bug_report.md`
- File is NOT committed to git
- Content covers the bug, cause, fix, and recommendations

Depends on

done .assign-write-bug-report

Required by

(none)

Log

2026-04-02T19:11:48.157941750+00:00 Task paused
2026-04-02T19:11:53.237732610+00:00 Task published
2026-04-02T19:12:16.916546562+00:00 Lightweight assignment: agent=Default Creator (ead7f530), exec_mode=full, context_scope=clean, reason=Creator role is optimal for composing new markdown documentation from provided context; strong track record (0.87 score, 43 tasks completed).
2026-04-02T19:12:17.170715781+00:00 Spawned by coordinator --executor claude --model claude-sonnet-4-20250514
2026-04-02T19:13:17.064165016+00:00 Bug report markdown file completed. Created comprehensive 4.8KB document covering YAML parse error, root cause analysis, resolution steps, and prevention recommendations. File exists at wg_evolve_yaml_bug_report.md and is NOT committed to git as requested.
2026-04-02T19:13:20.014372281+00:00 Task marked as done