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Morgan Xu profile picture

Morgan Xu

Backend developer who loves Rust and distributed systems.

Location Toronto, Canada Joined Joined on 

Education

University of Toronto

Work

Backend Developer at DataFlow Inc

Postmortem: A Tool Result Schema Defaulted Missing Failures to Zero
bytepro_1774 profile

Postmortem: A Tool Result Schema Defaulted Missing Failures to Zero

#testing #python #ai #devops
Comments
7 min read
Postmortem: sitecustomize.py in the Job Root Rewrote Every Import
bytepro_1774 profile

Postmortem: sitecustomize.py in the Job Root Rewrote Every Import

#python #testing #devops #ai
Comments
7 min read
Postmortem: Same-Job Autouse Fixtures Certified a Broken Import
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Postmortem: Same-Job Autouse Fixtures Certified a Broken Import

#testing #python #git #ci
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7 min read
Postmortem: git apply || true Accepted an HTML Error Page
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Postmortem: git apply || true Accepted an HTML Error Page

#git #ai #testing #devops
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6 min read
Postmortem: The Merge Gate Scored the Agent Transcript
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Postmortem: The Merge Gate Scored the Agent Transcript

#ai #testing #git #devops
Comments
7 min read
Postmortem: Path Allowlist Matched the Client CWD, Not the Job Root
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Postmortem: Path Allowlist Matched the Client CWD, Not the Job Root

#ai #testing #python #git
Comments
7 min read
Postmortem: Path Allowlist Matched the Client CWD, Not the Job Root
bytepro_1774 profile

Postmortem: Path Allowlist Matched the Client CWD, Not the Job Root

#ai #testing #python #git
Comments
7 min read
Postmortem: Squash-Merge Made HEAD~1 Target Unrelated Code
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Postmortem: Squash-Merge Made HEAD~1 Target Unrelated Code

#git #ai #testing #devops
Comments
7 min read
Postmortem: A Reused Sandbox Served Yesterday's Output as Today's Input
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Postmortem: A Reused Sandbox Served Yesterday's Output as Today's Input

#ai #devops #testing #postmortem
Comments
5 min read
Postmortem: Shared-Host Jitter Shipped a Timeout-Only Fix
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Postmortem: Shared-Host Jitter Shipped a Timeout-Only Fix

#ai #testing #agents #debugging
Comments
6 min read
Postmortem: Truncated Stream Applied a Partial File, Then the Loop Deleted the Rest
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Postmortem: Truncated Stream Applied a Partial File, Then the Loop Deleted the Rest

#ai #debugging #agents #python
Comments
7 min read
Postmortem: Readiness Probe Replayed a One-Shot File Delete
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Postmortem: Readiness Probe Replayed a One-Shot File Delete

#ai #agents #debugging #testing
Comments
6 min read
Postmortem: 429 Retry Wrote Into a Recycled Agent Slot
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Postmortem: 429 Retry Wrote Into a Recycled Agent Slot

#ai #agents #debugging #testing
Comments
8 min read
Postmortem: Optional Tool Args Let an Agent Invent a Write Path
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Postmortem: Optional Tool Args Let an Agent Invent a Write Path

#ai #agents #debugging #testing
Comments
7 min read
Postmortem: Snapshot Refresh Hid a Breaking Field Rename
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Postmortem: Snapshot Refresh Hid a Breaking Field Rename

#testing #ai #debugging #python
Comments
6 min read
Postmortem: Stale Workspace Index Rewrote a Deleted Path
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Postmortem: Stale Workspace Index Rewrote a Deleted Path

#ai #git #debugging #devops
Comments
7 min read
Postmortem: Context Compaction Dropped the Migration Guardrail
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Postmortem: Context Compaction Dropped the Migration Guardrail

#ai #agents #debugging #python
Comments
7 min read
Postmortem: Truncated Tool JSON Applied Half a Schema Change
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Postmortem: Truncated Tool JSON Applied Half a Schema Change

#ai #python #debugging #agents
Comments
8 min read
Fair Queue for a Shared Free AI Server: 5-Dev Postmortem
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Fair Queue for a Shared Free AI Server: 5-Dev Postmortem

#fairqueue #python #asyncio #devops
Comments
6 min read
Postmortem: Preemption Split a Multi-File Agent Apply
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Postmortem: Preemption Split a Multi-File Agent Apply

#devops #testing #ai #opensource
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7 min read
A 10-Task Gate for MonkeyCode's Free Server
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A 10-Task Gate for MonkeyCode's Free Server

#ai #testing #opensource #devops
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4 min read
Postmortem: Two Agent Jobs Wrote Into the Same Checkout
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Postmortem: Two Agent Jobs Wrote Into the Same Checkout

#git #ai #debugging #devops
Comments
7 min read
Postmortem: The Retry Storm That Burned the Token Budget
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Postmortem: The Retry Storm That Burned the Token Budget

#ai #llm #python #devops
Comments
4 min read
Postmortem: The Stale-Response Incident That Broke Our Review Bot
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Postmortem: The Stale-Response Incident That Broke Our Review Bot

#ai #postmortem #testing #devops
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4 min read
Postmortem: The Free Tier Wasn't the Problem — Our Guardrails Were
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Postmortem: The Free Tier Wasn't the Problem — Our Guardrails Were

#postmortem #ai #devops
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4 min read
Postmortem: The Review Gate That Approved Everything
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Postmortem: The Review Gate That Approved Everything

#postmortem #ai #testing #devops
Comments
3 min read
Postmortem: The 93% Green Eval Was Statistical Noise
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Postmortem: The 93% Green Eval Was Statistical Noise

#ai #testing #postmortem #llm
Comments
4 min read
Postmortem: The Agent Loop That Died Quietly While the Eval Said Green
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Postmortem: The Agent Loop That Died Quietly While the Eval Said Green

#ai #testing #devops #observability
Comments
4 min read
Postmortem: The Free AI Server That Passed Every Test, Then Failed at 02:14
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Postmortem: The Free AI Server That Passed Every Test, Then Failed at 02:14

#ai #testing #devops #python
Comments
5 min read
Free AI Servers Break in Seven Patterns: A Field Guide
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Free AI Servers Break in Seven Patterns: A Field Guide

#ai #python #workflow #opensource
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4 min read
MiniMax H3: Run This 30-Minute Gate Before You Trust It
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MiniMax H3: Run This 30-Minute Gate Before You Trust It

#ai #benchmarking #opensource #devtools
Comments
4 min read
A Free-Tier Triage Harness for AI Patches: Make the Model Earn Your Attention
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A Free-Tier Triage Harness for AI Patches: Make the Model Earn Your Attention

#ai #codereview #testing #python
Comments
5 min read
Before You Plug a Model Into Your Pipeline, Make It Pass a Contract Test
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Before You Plug a Model Into Your Pipeline, Make It Pass a Contract Test

#ai #testing #devops #python
Comments
6 min read
A New Open-Weight Model Drops Every Week. Here's the 30-Minute Eval Harness I Run Before Believing Any Benchmark
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A New Open-Weight Model Drops Every Week. Here's the 30-Minute Eval Harness I Run Before Believing Any Benchmark

#ai #opensource #llm #tooling
Comments
6 min read
Green Tests Lie: How I Gate AI-Generated Patches Before They Touch Main
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Green Tests Lie: How I Gate AI-Generated Patches Before They Touch Main

#ai #testing #security #codereview
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5 min read
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