debug-loop

A systematic debugging playbook for Forge's agent loop, the part that coordinates model turns and tool calls. It uses logs, event streams, focused checks, and a failing test before the fix.

In plain words
What is it for?
Reproducing loop problems, inspecting session events, checking turn caps and validation, finding missing tools or denied permissions, and testing the eventual fix.
Why use it?
It gives developers a repeatable way to find whether looping or incorrect tool calls come from limits, validation, registration, permissions, or task state.

Skill for Claude CodeCodex

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/hoangsonww/forge-agentic-coding-cli/debug-loop
Any agent
npx skills add hoangsonww/Forge-Agentic-Coding-CLI --skill debug-loop
Clone the repo
git clone --depth 1 https://github.com/hoangsonww/Forge-Agentic-Coding-CLI

Made for: Claude Code, Codex.

Per session 43 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 398 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.

ModelPer sessionOnce invoked
Fable 5 $0.00043 $0.00398
Opus 5 $0.00022 $0.00199
Sonnet 5 $0.00009 $0.00080
Haiku 4.5 $0.00004 $0.00040

Measured 2d ago against content hash 03f16705b6ff, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

debug-loop 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.

.agents/skills/debug-loop/SKILL.md · 50 lines

What it actually says

The loop is the most expensive place to be wrong. Instrument before you change anything.

1. Reproduce deterministically

FORGE_LOG_LEVEL=debug ./bin/forge.js <command>

Capture the session id. Events land in ~/.config/forge/events/<session>.ndjson.

If the bug only reproduces against a real provider, pin the model and disable router fallback:

FORGE_MODEL=... FORGE_ROUTER_FALLBACK=0 ./bin/forge.js <command>

2. Read the event stream, not the terminal

Each turn emits: turn.start, model.call, tool.call, tool.result, validation.result, turn.end. Missing or out-of-order events are your bug.

3. Check the usual suspects, in order

  1. Mode caps (src/core/mode-policy.ts) — is the agent hitting turn/token cap?
  2. Validation gate (src/core/validation.ts) — is a valid step being rejected?
  3. Tool registry — is the requested tool actually registered? tool.call with class: not_found means no.
  4. Permissions — silently denied? tool.result.denied=true.
  5. State machine (src/persistence/tasks.ts) — illegal transition attempted?

4. Add a failing test before the fix

Template: test/unit/executor-loop.test.ts. Mock callModel. If the test you add doesn't turn green after your fix, you fixed the wrong thing.

5. Finish with verify.

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.

  1. 2d ago First seen · 50 lines · 43 tokens per session scan A 03f16705b6ff

Subscribe to this mod's changes

debug-loop is a skill published in the GitHub repository hoangsonww/Forge-Agentic-Coding-CLI (22 stars, last pushed 16d ago), licensed MIT. It adds 43 tokens to every session and 398 once invoked, about $0.0002 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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