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Casey Sun

Software engineer by day, open source contributor by night.

Location San Francisco, CA Joined Joined on 
When Not to Let a Free Model Tune Outbound Caps

When Not to Let a Free Model Tune Outbound Caps

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7 min read
Keep Free Lanes Off the Signed Webhook Path

Keep Free Lanes Off the Signed Webhook Path

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7 min read
The Cache Key Is Not a Prompt Output

The Cache Key Is Not a Prompt Output

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6 min read
When a Free Model Must Not Time the Dual-Write Cutover

When a Free Model Must Not Time the Dual-Write Cutover

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8 min read
When the Canary Judge Must Not Be a Free Model

When the Canary Judge Must Not Be a Free Model

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7 min read
The Test Oracle Stays Pinned: A When-Not-To Field Guide

The Test Oracle Stays Pinned: A When-Not-To Field Guide

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7 min read
Keep Free-Lane Diffs Off the Schema Lock

Keep Free-Lane Diffs Off the Schema Lock

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8 min read
When the Free Tier Stops Being Cheap: A Load-Based Exit Test for Agent Backends

When the Free Tier Stops Being Cheap: A Load-Based Exit Test for Agent Backends

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5 min read
Agent Scratchpads Fail Closed: A When-Not-To Field Guide

Agent Scratchpads Fail Closed: A When-Not-To Field Guide

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7 min read
Do Not Let a Free Model Author the Agent Allowlist

Do Not Let a Free Model Author the Agent Allowlist

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6 min read
Do Not Let a Free Lane Own the Agent Halt Bit

Do Not Let a Free Lane Own the Agent Halt Bit

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6 min read
Refuse Free-Tier Routing on Privileged Agent Steps

Refuse Free-Tier Routing on Privileged Agent Steps

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7 min read
Stop Treating Free-Model LGTM as a Merge Gate

Stop Treating Free-Model LGTM as a Merge Gate

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7 min read
Do Not Bind Agent Webhooks to a Free Host

Do Not Bind Agent Webhooks to a Free Host

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7 min read
Uncited Runtime Does Not Belong on a Free Host

Uncited Runtime Does Not Belong on a Free Host

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6 min read
When Not to Ship Architecture the Agent Invented

When Not to Ship Architecture the Agent Invented

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7 min read
Fail the Plan When Missing Config Resolves to Free Compute

Fail the Plan When Missing Config Resolves to Free Compute

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6 min read
Fail CI When the Agent Treats Free Compute as Inventory

Fail CI When the Agent Treats Free Compute as Inventory

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7 min read
When an Agent Invents a Cache, Refuse the Merge

When an Agent Invents a Cache, Refuse the Merge

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6 min read
Every Token Is a Line Item: A Ledger Workflow for Agent Spend

Every Token Is a Line Item: A Ledger Workflow for Agent Spend

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4 min read
Kill the Merge When the Agent Invents Shared State

Kill the Merge When the Agent Invents Shared State

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6 min read
Free AI Compute Has an Expiration Date: A 'Do Not Use' Field Guide

Free AI Compute Has an Expiration Date: A 'Do Not Use' Field Guide

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4 min read
Best-Effort AI Needs a Tripwire: A Circuit Gate for Free Model Endpoints

Best-Effort AI Needs a Tripwire: A Circuit Gate for Free Model Endpoints

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4 min read
Free AI Compute Is a Contract, Not a Gift: Stress-Testing MonkeyCode's Free Server Before You Commit

Free AI Compute Is a Contract, Not a Gift: Stress-Testing MonkeyCode's Free Server Before You Commit

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4 min read
Measure Before You Migrate: The 30-Minute Probe for Free AI Infrastructure

Measure Before You Migrate: The 30-Minute Probe for Free AI Infrastructure

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4 min read
Free Quotas Turn You Into a Reviewer: A Workload-Fit Field Guide

Free Quotas Turn You Into a Reviewer: A Workload-Fit Field Guide

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5 min read
Not Every Workload Belongs on a Free Server: Red Flags and Exit Criteria

Not Every Workload Belongs on a Free Server: Red Flags and Exit Criteria

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5 min read
The Free-Tier Trap: A Field Guide for Agent Engineers

The Free-Tier Trap: A Field Guide for Agent Engineers

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4 min read
Free AI Servers Are a Constraint, Not a Gift: A Reproducible Evaluation

Free AI Servers Are a Constraint, Not a Gift: A Reproducible Evaluation

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5 min read
Quota Exhaustion Date: A Capacity Calculator for Free Model Quotas

Quota Exhaustion Date: A Capacity Calculator for Free Model Quotas

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4 min read
A Lower Price Tag Is Not a Migration Plan: Quarantining New Models Before They Touch Your Agent

A Lower Price Tag Is Not a Migration Plan: Quarantining New Models Before They Touch Your Agent

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6 min read
Treat Every New Open Model Like a Dependency Upgrade: A Pre-Flight Gate

Treat Every New Open Model Like a Dependency Upgrade: A Pre-Flight Gate

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5 min read
Model Swaps Are Boundary Events: Gate Agent Tool Changes With a Deterministic Replay Lane

Model Swaps Are Boundary Events: Gate Agent Tool Changes With a Deterministic Replay Lane

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6 min read
Attack Your Agent's Tool Boundaries Before Someone Else Does: A Repeatable Test Harness

Attack Your Agent's Tool Boundaries Before Someone Else Does: A Repeatable Test Harness

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6 min read
A Repeatable Way to Regression-Test Your Prompts Before You Ship Them

A Repeatable Way to Regression-Test Your Prompts Before You Ship Them

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5 min read
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