A workflow for diagnosing and fixing failed application builds using structured error output. It checks build errors, debug context, imports, types, configuration, and application health before rebuilding.

Use it to investigate missing modules, type errors, invalid configuration, and other Veryfront build failures, then rebuild and run a health check.

It turns a failed build into a sequence of checks that can identify the cause and confirm whether the fix worked.

debug-build — Skill by veryfront

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add skills/veryfront/veryfront-code/debug-build

Any agent

npx skills add veryfront/veryfront-code --skill debug-build

Clone the repo

git clone --depth 1 https://github.com/veryfront/veryfront-code

Made for: Claude Code, Codex.

Per session 14 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 283 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5	$0.00014	$0.00283
Opus 5	$0.00007	$0.00142
Sonnet 5	$0.00003	$0.00057
Haiku 4.5	$0.00001	$0.00028

Measured 2d ago against content hash 3dfdb9767e59, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

debug-build scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

cli/mcp/skills/debug-build/SKILL.md · 46 lines

What it actually says

Debug Build

Diagnose and fix build failures using structured error output.

Steps

Reproduce the failure
```
veryfront build --json
```
Capture the error envelope.
Get error context (via MCP) Use vf_get_errors to get all current errors. Use vf_get_debug_context for additional context.
Analyze errors Common build error patterns:
- Import resolution: missing module, wrong hash import path
- Type errors: check deno check output
- Config errors: verify deno.json and veryfront.json
Fix and verify Apply the fix, then rebuild:
```
veryfront build --json
```
Run health check
```
veryfront doctor --json
```

Error Recovery

Module not found: Check deno.json imports map, verify file exists
Type errors: Run deno check src/index.ts for detailed diagnostics
Config invalid: Compare against a working deno.json from a fresh veryfront init

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2d ago First seen · 46 lines · 14 tokens per session scan A 3dfdb9767e59

Subscribe to this mod's changes

debug-build is a skill published in the GitHub repository veryfront/veryfront-code (18 stars, last pushed 2d ago), licensed Apache-2.0. It adds 14 tokens to every session and 283 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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