preflight

A startup checklist for a software project. It checks the Git branch and files, the Neo4j database, the Python virtual environment, automated tests, and stored graph data.

In plain words
What is it for?
Use it before implementation to confirm the development environment is ready and tests pass. It also reports whether the Neo4j graph contains data.
Why use it?
It catches setup and repository problems before new code is changed. This helps prevent work from starting on a protected branch or a broken project.

Command 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 commands/cognitx-leyton/codegraph/preflight
Clone the repo
git clone --depth 1 https://github.com/cognitx-leyton/codegraph

Made for: Claude Code.

Per session 19 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 482 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. 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 $0.00019 $0.00482
Opus 5 $0.00010 $0.00241
Sonnet 5 $0.00004 $0.00096
Haiku 4.5 $0.00002 $0.00048

Measured yesterday against content hash f6f1a8244e02, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

preflight scanned grade A with 1 finding 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

- Wait for healthy: `curl -sf http://localhost:7475 > /dev/null`
.claude/commands/preflight.md · 60 lines

What it actually says

Pre-flight Check (Step 0)

Run all checks before starting any implementation work. Report pass/fail for each.

Checks

1. Git state

git branch --show-current
git status -s
git log --oneline -3
  • Must be on a feature branch (feat/, fix/, chore/) — NOT on main, release, hotfix, or dev
  • Working tree should be clean (untracked .claude/ files are OK)

2. Neo4j container

docker ps --format '{{.Names}} {{.Status}}' | grep codegraph-neo4j
  • If not running: cd codegraph && docker compose up -d
  • Wait for healthy: curl -sf http://localhost:7475 > /dev/null

3. Python venv

.venv/bin/codegraph --help > /dev/null 2>&1
  • If missing: python3 -m venv .venv && .venv/bin/pip install -e ".[python,mcp,test]"

4. Test suite

.venv/bin/python -m pytest tests/ -q
  • All tests must pass before starting new work

5. Graph state

.venv/bin/codegraph query "MATCH (n) RETURN count(n) AS nodes"
  • If 0 nodes: suggest running /graph-refresh

Report

Pre-flight Report
-----------------
Git branch:    feat/issue-N-slug ✅ / ❌ (on {protected branch})
Working tree:  clean ✅ / dirty ❌
Neo4j:         running ✅ / down ❌ (fixed ✅)
Python venv:   OK ✅ / missing ❌ (fixed ✅)
Tests:         {N} passed ✅ / {N} failed ❌
Graph:         {N} nodes ✅ / empty ❌

Ready to work: YES / NO — fix {issues} first
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 · 60 lines · 19 tokens per session scan A f6f1a8244e02

Subscribe to this mod's changes

preflight is a command published in the GitHub repository cognitx-leyton/codegraph (11 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 19 tokens to every session and 482 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.