debug-react

A command for investigating a live React application—the JavaScript library used to build many web interfaces—before changing its source code.

In plain words
What is it for?
Use it to replay a failing path, inspect React components and their data, examine browser events, find the responsible component or request, and validate the fix.
Why use it?
It helps identify what actually fails in the browser, including component behavior, console errors, network requests, and runtime state.

Command

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 commands/edgarbnt/reactsentinel/debug-react
Clone the repo
git clone --depth 1 https://github.com/edgarbnt/ReactSentinel
Per session 14 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 205 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 $0.00014 $0.00205
Opus 5 $0.00007 $0.00102
Sonnet 5 $0.00003 $0.00041
Haiku 4.5 $0.00001 $0.00020

Measured yesterday against content hash 16ddef1a5afd, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

debug-react 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 yesterday.

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.

assets/agent-pack/commands/debug-react.md · 24 lines

What it actually says

debug-react

Use this command when the task looks like a real browser or React runtime bug instead of a pure source-code question.

  1. Call get_server_info and get_session_status.
  2. Prefer Replay first unless the bug depends on real user state.
  3. Call get_console_events and get_network_events early.
  4. Confirm runtime health with get_runtime_status.
  5. Inspect the React tree with inspect_component or get_react_tree.
  6. Read runtime values with get_component_state, get_async_timeline, get_render_hotspots, or related diagnostics.
  7. Convert the observed failure into validate_after_action or validate_scenario.

Expected outcome

  • the failing runtime path is observed, not guessed;
  • the owning component or network failure is identified;
  • and the investigation ends with a validation-ready scenario.
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. yesterday First seen · 24 lines · 14 tokens per session scan A 16ddef1a5afd

Subscribe to this mod's changes

debug-react is a command published in the GitHub repository edgarbnt/ReactSentinel (1 stars, last pushed 3mo ago), licensed MIT. It adds 14 tokens to every session and 205 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 2026-08-31.