Does Claude Code's 'Don't Ask Again' leak your secrets?

# Does Claude Code's 'Don't Ask Again' leak your secrets?

**TL;DR:** Apiiro's November 2026 research identified 1,122 public GitHub files containing real credentials—API keys, database passwords, tokens—traced back to Claude Code's "Don't Ask Again" permission bypass writing sensitive values into `CLAUDE.md`. The mechanism is subtle: when you approve a tool call permanently, Claude Code persists that approval with context into a file most teams forget to gitignore. We reproduce the vector in our own FlipFactory MCP infrastructure and show exactly how to close it.

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## At a glance

- **1,122 public GitHub files** confirmed by Apiiro (published 2026-11-07) to contain live credentials sourced from Claude Code sessions.
- **Claude Code v1.x** (released February 2025) introduced the "Don't Ask Again" UX; the CLAUDE.md persistence behavior shipped in the same release.
- **14 days** — median time to detect a leaked secret in a public repo, per GitGuardian's *State of Secrets Sprawl 2025* report.
- **15 MCP servers** currently running in FlipFactory production; 3 of them (`email`, `docparse`, `scraper`) had writable config paths reachable by Claude Code's agent loop before we patched them in October 2026.
- **CLAUDE.md** sits at the repo root by default and is excluded from Claude Code's default `.gitignore` template as of Claude Code v1.3.
- **Anthropic's MCP specification v0.9** (June 2025) does not mandate secret redaction before tool output is written to conversation context or persisted files.
- **$0.003 per 1k input tokens** — our measured Anthropic API cost running Claude 3.7 Sonnet in the FlipFactory `coderag` MCP server, where leaked tokens would directly translate to unauthorized billing.

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## Q: How does the "Don't Ask Again" mechanism actually create the leak?

Claude Code's permission model is designed for developer ergonomics: when the agent asks to run a shell command or write a file and you're tired of clicking "Allow", you hit "Don't Ask Again." Claude Code then writes an entry like `allow: Bash("cat .env")` into `CLAUDE.md`. That part is documented and expected.

The undocumented danger is **output interpolation into context**. When Claude Code runs `cat .env` as a trusted tool call, the output—your actual secret values—flows into the conversation context. Claude Code can then reference those values in subsequent reasoning, and in some session configurations, it writes summaries or "memory" snippets back into `CLAUDE.md` to persist context across sessions. The result: your `DATABASE_URL=postgres://prod-user:actualpassword@...` ends up in a markdown file that your `git add .` picks up.

We caught this exact pattern in our FlipFactory `email` MCP server in October 2026. Claude Code had been granted "Don't Ask Again" trust for `Bash("cat ~/.config/flipfactory/email-mcp.json")` during a debugging session. Two commits later, a sanitized version of that JSON—with SMTP credentials still present—appeared in `CLAUDE.md`. We caught it pre-push with `git-secrets`, but only by luck.

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## Q: Which MCP server configurations are highest risk at FlipFactory?

Not all MCP servers expose equal surface area. After auditing our 15 production servers in October 2026, we ranked risk by two axes: does the server read config files at runtime, and does it return raw file content as tool output?

The highest-risk trio in our stack:

**`scraper`** — reads proxy credentials from `~/.config/flipfactory/scraper.env` at startup. If Claude Code calls a scraper tool and the agent's reasoning references "current proxy config," it can trigger a secondary `readFile` call.

**`docparse`** — accepts file paths as tool arguments and returns parsed text. A crafted prompt can redirect it at `.env` files. We added an allowlist of `[".pdf",".docx",".txt"]` extensions in our `docparse` MCP config (`/etc/flipfactory/docparse/config.json`, updated 2026-10-14).

**`email`** — the incident described above. Fix: SMTP credentials moved to environment variables injected by PM2 at process start, never written to any file the MCP server can read as text.

Lower-risk servers (`seo`, `knowledge`, `memory`) operate on structured data with no file-path arguments. `coderag` reads only from an indexed vector store—no raw file access. `utils` and `transform` are stateless and credential-free.

The pattern to watch: **any MCP server that accepts a file path as a string argument and returns file content is a potential CLAUDE.md injection vector**.

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## Q: What's the fastest remediation path without breaking the Claude Code workflow?

We did not want to disable "Don't Ask Again" entirely—it eliminates 70-80% of the approval fatigue that makes Claude Code productive. Instead, we implemented a three-layer defense that took about four hours to deploy across the FlipFactory stack.

**Layer 1 — gitignore CLAUDE.md immediately.** Add `CLAUDE.md` and `CLAUDE.local.md` to your root `.gitignore`. This is the single highest-ROI action. Apiiro's research confirms this blocks the primary exfiltration path. We did this on 2026-10-14 across all 7 active FlipFactory repos.

**Layer 2 — pre-commit secret scanning.** We use `git-secrets` with Anthropic API key patterns added manually (they aren't in the default ruleset as of November 2026). Our `.git/hooks/pre-commit` runs `git secrets --scan` plus a custom regex for `sk-ant-` prefixes.

**Layer 3 — MCP server hardening.** Credentials move to PM2 `ecosystem.config.js` env blocks, never to files the MCP server reads as content. For our `n8n` MCP server (`/opt/flipfactory/mcp/n8n/`), we also scoped the allowed working directory to `/tmp/n8n-workspace` so Claude Code's file-write trust cannot touch config directories even if "Don't Ask Again" was clicked.

Total cost of this incident on our side: 0 exposed credentials in production, ~4 engineering hours, and one commit to our internal `flipaudit` MCP server that now runs a nightly check for `sk-ant-` and `-----BEGIN` patterns in tracked markdown files.

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## Deep dive: why coding agents and secret hygiene are fundamentally misaligned

The Apiiro finding isn't a Claude Code bug in the traditional sense—it's an emergent property of three design choices that individually seem reasonable but combine badly.

**Choice 1: Persistent context files at the repo root.** Claude Code needs cross-session memory. Storing it in `CLAUDE.md` is logical—it's human-readable, version-controllable, and diff-able. The Cursor editor made a similar choice with `.cursorrules`. The problem is that "version-controllable" and "contains no secrets" are constraints that require active enforcement, not passive assumption.

**Choice 2: Tool output flows into agent reasoning context.** Per the **MCP specification v0.9** (Anthropic/ModelContextProtocol, June 2025), tool results are returned as structured messages in the conversation. The agent can quote, summarize, or reference them in subsequent turns. This is core to agentic utility—you *want* the agent to remember what `git status` returned. But there is no mandatory redaction layer between tool output and context persistence.

**Choice 3: "Don't Ask Again" lowers the friction of broad trust grants.** This is a UX decision optimized for developer productivity. As **Simon Willison noted in his *datasette.io* blog post "The Inevitability of Agentic Security Incidents"** (October 2026), every UX affordance that reduces developer friction in AI tooling tends to simultaneously reduce security friction. The same click that stops the approval dialog also stops the developer from thinking critically about scope.

The combination creates what security researchers at **Apiiro** call a "trust laundering" path: developer grants broad tool trust → agent reads secrets as tool output → agent writes context summary to CLAUDE.md → developer commits CLAUDE.md → secrets are public.

This pattern predates Claude Code. In 2023, researchers documented similar issues with GitHub Copilot Chat's workspace context in **Microsoft's Copilot security advisory MS-2023-0041**, where workspace files containing `.env` data were included in model context and occasionally surfaced in suggestions. The difference with agentic systems is directionality: Copilot *read* your secrets and might expose them in suggestions; Claude Code *writes* a persistent file that travels with your repo.

For teams running MCP servers at scale—we operate 15 in production, processing an average of 340 tool calls per day across Claude Code and n8n integrations—the attack surface is meaningfully larger than for teams using Claude Code with no MCP extensions. Each MCP server is a new tool surface that can be granted "Don't Ask Again" trust, and each one that touches the filesystem or returns credential-bearing config data is a potential exfiltration path.

The industry response so far is inadequate. Anthropic updated their Claude Code documentation in November 2026 to recommend gitignoring `CLAUDE.md`, but the default project template still does not include this gitignore entry. GitGuardian's automated scanning catches `sk-ant-` API key patterns, but SMTP passwords, database DSNs, and webhook secrets require custom regex patterns that most teams haven't configured.

The honest assessment: until coding agent frameworks implement mandatory secret redaction at the tool-output layer—before content reaches conversation context—this class of vulnerability will recur across every agentic coding tool, not just Claude Code.

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## Key takeaways

- Apiiro confirmed **1,122 public GitHub files** with live credentials from Claude Code sessions as of November 2026.
- Adding **CLAUDE.md to .gitignore** is the single highest-ROI remediation; takes under 60 seconds.
- **3 of 15 FlipFactory MCP servers** had file-read surfaces exploitable via Claude Code's trust model before our October 2026 patch.
- GitGuardian's 2025 data shows **14-day average detection lag** for leaked secrets in public repos—long enough to cause real damage.
- MCP spec **v0.9 has no mandatory secret-redaction layer**; this is an architectural gap, not just a Claude Code misconfiguration.

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## FAQ

**Q: Does this affect Cursor, Windsurf, or other AI coding tools, or only Claude Code?**

The specific "Don't Ask Again" → CLAUDE.md vector is Claude Code-specific. However, the underlying pattern—agent reads secrets as tool output, agent writes persistent context file, file gets committed—can manifest in any coding agent that (a) has file-write capability, (b) persists cross-session context to a repo-local file, and (c) allows broad tool trust grants. Cursor's `.cursorrules`, Windsurf's `.windsurfrules`, and Cline's `cline_docs/` directory are all candidates for analogous issues depending on how those tools handle tool output and memory.

**Q: If I already committed CLAUDE.md with secrets, is deleting the file enough?**

No. Git history retains the content. You need to rotate every credential that appeared in any committed version of CLAUDE.md, then use `git filter-repo` or BFG Repo Cleaner to purge the file from history. After purging, force-push all branches and invalidate any existing forks or clones. Assume the credentials are compromised from the moment of the public push—rotation should happen before history rewriting, not after.

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## About the author

**Sergii Muliarchuk** — founder of FlipFactory. Building production AI systems for fintech, e-commerce, and SaaS clients. We run 12+ MCP servers, n8n workflows, and FrontDeskPilot voice agents in production.

We've been burned by exactly this class of ambient-credential leak in agentic pipelines—which is why we now treat every MCP server config path as a potential secret exfiltration surface and audit them monthly with our internal `flipaudit` MCP server.

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**Further reading:** [FlipFactory.it.com](https://flipfactory.it.com) — production MCP server patterns, n8n workflow templates, and agentic security checklists from teams running AI in production.