Breaking Change Detector

Breaking Change Detector is an agent for Claude Code from continuedev/continue. It costs 16 tokens per session (418 once invoked), scanned A, original, Apache-2.0.

A code-review agent that checks whether renamed or changed commands, APIs, configuration formats, and URLs still have references elsewhere in the codebase.

In plain words
What is it for?
Use it when changing public interfaces or configuration in a large repository, especially a monorepo—a repository containing several related projects.
Why use it?
It helps prevent breaking changes from leaving outdated documentation, callers, workflows, or configuration behind.

Agent for Claude Code ✓ vendor

Written for Claude Code: a Claude Code subagent (agents/*.md). Also seen: built for continue.dev.

Good fit Use it when changing public interfaces or configuration in a large repository, especially a monorepo—a repository containing several related projects.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/continuedev/continue/breaking-change-detector
About the project

Continue is an open-source coding agent that works through a command-line interface, a VS Code extension, and a JetBrains plugin. Developers use it to assist with software development, configuration, and customization. The catalogue entries are add-ons for Continue.

continuedev/continue · 36,228 stars · on GitHub · continue.dev

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.

Clone the repo
git clone --depth 1 https://github.com/continuedev/continue

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for Breaking Change Detector

README.md
[![agentmods](https://agentmods.dev/badge/agents/continuedev/continue/breaking-change-detector/github.svg)](https://agentmods.dev/agents/continuedev/continue/breaking-change-detector)
Your own site
<a href="https://agentmods.dev/agents/continuedev/continue/breaking-change-detector"><img src="https://agentmods.dev/badge/agents/continuedev/continue/breaking-change-detector/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for Breaking Change Detector

Your own site · 80×15
<a href="https://agentmods.dev/agents/continuedev/continue/breaking-change-detector"><img src="https://agentmods.dev/badge/agents/continuedev/continue/breaking-change-detector.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 16 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 418 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00016 $0.00418
Opus 5.5 $0.00006 $0.00167
Sonnet 5.5 $0.00003 $0.00084
Haiku 4.5 $0.00002 $0.00042

Measured 1mo ago against content hash 7f0fedbc6b4e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

Breaking Change Detector 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 1mo 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.

.continue/agents/breaking-change-detector.md · 44 lines

What it actually says

Breaking Change Detector

Analyze this pull request for breaking changes that may leave stale references elsewhere in the codebase.

What Constitutes a Breaking Change

  1. CLI command renames or removals - If a command registered in extensions/cli/src/commands/ is renamed, removed, or has its flags changed, check that:

    • Documentation in docs/ reflects the new name
    • Agent definitions in .continue/agents/ don't reference the old command
    • Skills in skills/ are updated
    • README and CONTRIBUTING.md are current
    • GitHub Actions workflows don't invoke the old command
  2. Public API changes - If exported functions, interfaces, or types in core/ or packages/ are renamed or have signature changes, check that:

    • All callers in gui/, extensions/, and binary/ are updated
    • Type definitions in packages/config-types/ are consistent
  3. Configuration schema changes - If config file formats (YAML or JSON) are modified, check that:

    • Validation logic handles both old and new formats (or migration is provided)
    • Documentation examples use the new format
    • Default configs are updated
  4. URL changes - If any hardcoded URLs (e.g., hub.continue.dev, api.continue.dev) are changed, scan for stale references across the repo.

What to Do

  • If you find stale references, fix them directly.
  • If a breaking change has no migration path and could affect users, add a comment noting the concern but do not block.
  • Focus only on changes introduced in this PR. Do not flag pre-existing issues.

What NOT to Flag

  • Internal refactors where all references are updated in the same PR
  • Changes to test-only code
  • Changes to development tooling that don't affect users
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. 1mo ago First seen · 44 lines · 16 tokens per session scan A 7f0fedbc6b4e

Subscribe to this mod's changes

Breaking Change Detector is an agent published in the GitHub repository continuedev/continue (36,228 stars, last pushed yesterday), licensed Apache-2.0. It adds 16 tokens to every session and 418 once invoked, about $0.0001 per session on Opus 5.5. 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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