keystone-code-debt

A checker for technical debt in a codebase, meaning known code problems or compromises that make future work harder. It also examines new debt introduced by current changes.

In plain words
What is it for?
Use it during a codebase audit or change review to find TODOs, FIXMEs, hacks, deprecated code, complexity hotspots, and existing debt. It reports their location, category, severity, ownership when known, and whether they are new.
Why use it?
It turns scattered warning markers and known compromises into a categorized list that the team can track and review.

Agent for Claude Code

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 agents/tacoda/keystone/keystone-code-debt
Clone the repo
git clone --depth 1 https://github.com/tacoda/keystone

Made for: Claude Code.

Per session 38 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 514 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 94% copy Near-identical to another mod 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 $0.00038 $0.00514
Opus 5 $0.00019 $0.00257
Sonnet 5 $0.00008 $0.00103
Haiku 4.5 $0.00004 $0.00051

Measured 2d ago against content hash 4dd70a86dccd, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

keystone-code-debt 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.

Origin

This is a copy

94% identical to code-debt — 7 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.claude/agents/keystone-code-debt.md · 40 lines

What it actually says

Sensor: code-debt

Surfaces and categorizes debt in the codebase — the known-suboptimal code the team has chosen to live with, plus the shape of any new debt being added in the current diff.

Paired sensor: charter-debt — covers debt in the charter itself (stale rules, placeholder bootstrap, empty idiom dirs, etc.). The two are tracked separately on purpose.

  • Triggeraudit (codebase-wide) and review (diff-scoped).
  • Inputsgit grep for debt markers (TODO, FIXME, HACK, XXX, DEPRECATED), complexity hotspots from risk-fingerprint, and any debt items already listed in corpus/state/code-debt.md.
  • Exit condition — every surfaced item is categorized (see Categories) and either matched to an existing ledger entry or proposed as a new one.
  • Output — table of debt items: location, category, severity, owner (if known), whether new in this diff.
  • State writes — proposes a diff to corpus/state/code-debt.md. User accepts or edits.

Categories

Category What it means
deliberate Known-suboptimal, chosen as a tradeoff. Has an owner and a trigger for revisit.
drift Was once fine; the surrounding code moved and left this stale.
shortcut A recent shortcut taken under time pressure.
discovery Newly noticed; not yet categorized.

A TODO without a category is automatically discovery until debt-review triages it.

Severity

  • load-bearing — change is dangerous; the surrounding region depends on this exact shape.
  • noisy — adds review burden but doesn't constrain change.
  • stale — no longer relevant; can be removed without thought.

Anti-noise rule

Don't surface TODO in vendored or generated code (anything excluded from lint). Don't surface debt the ledger already records unless its severity changed.

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 · 40 lines · 38 tokens per session scan A 4dd70a86dccd

Subscribe to this mod's changes

keystone-code-debt is an agent published in the GitHub repository tacoda/keystone (44 stars, last pushed 2mo ago), licensed MIT. It adds 38 tokens to every session and 514 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 94% identical to code-debt, differing in 7 lines, and is treated as a copy.

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