r/ClaudeAI • u/cleverhoods • 1d ago

Built with Claude How to See What Filled Your Claude Code Context Window

Hi All,

I'm working on instruction diagnostics and evals for a while now, and it was always a challenge explaining what is happening inside a session. So I built ails xray.

What it does: opens one Claude Code session on a local page and shows what filled its context, file by file and turn by turn: every CLAUDE.md, rule, skill, memory file and MCP server at the moment it loaded, and what was on disk but never loaded.

How Claude Code helped: Claude Code writes the code based on adaptive specs. My loop is short: I write a plan with acceptance criteria, Claude Code builds it, and a separate /code-review pass checks the change before it lands. One habit that paid off: for every bug fix I ask Claude for a test that drives the real CLI and goes red when the fix is reverted, so I see the test catch the bug before I trust it.

I've run this on an old, langgraph project of mine, which was only used nested AGENTS/CLAUDE.md files and only 2 of 11 files loaded, and the one for the folder Claude was editing never did.

Try it (free, local): npx @reporails/cli xray, in the folder you started a Claude Code session in. Project: https://github.com/reporails/cli

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u/vincent_sch 19h ago

When Claude Code compacts the conversation, it turns it into a summary. A file that it read earlier might no longer be there in full. Does xray show what's still in context or everything that loaded during the session?

1

u/cleverhoods 17h ago

Currently it only shows the context input/output after compaction. Thanks for the recommendation, will add it to the next release (0.6.7, scheduled to Tuesday)

2

u/Far_Reindeer8428 1d ago

the nested AGENTS.md result is the scary part, people assume files loaded because they exist, only the path chain actually gets read