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a local-first secret leak prevention layer for AI coding agents

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**Keep secret values out of AI coding agents.**

Fida is a local-first secret leak prevention layer for AI coding agents. It finds exposed credentials, gives agents redacted safe views of sensitive files and command output, and shows whether your installed agent integrations can still expose a raw value.

It is deliberately **not** a general agent policy engine, approval system, or developer workflow firewall. Fida does not decide which ordinary commands an agent may run, which files it may edit, or whether you may use `curl | sh`. Its one job is simple: a detected secret must not reach model context.

> Project status: MVP implemented. Fida installs local integrations, verifies its redaction path with a synthetic credential, scans repo risk, and records redaction-safe audit events.

## Quick start

```bash
# Install the binary. In a terminal it offers to set up protection right away.
curl -fsSL https://raw.githubusercontent.com/ajipurn/fida/main/install.sh | sh

# Run fida with no arguments any time to set up — or, once installed, to update.
fida

# Check coverage, including how many secrets have been protected.
fida status
```

`fida` is install-and-forget: it wires every coding agent it detects, and running it again later checks for an update. Run from a terminal, the installer offers to do this for you; piped or in CI it stays quiet and just prints `fida` as the next step.

## What Fida does

When an agent needs content that may contain a credential, Fida provides a sanitized view instead of the raw bytes:

```text
Agent -> fida_read .env -> scan -> redact -> agent

API_URL=https://example.test
API_KEY=[REDACTED]
```

Its integrations combine three layers:

1. **Redacting MCP gateway** — `fida_read` and `fida_shell` return redacted file content and captured command output. `fida_shell` still runs the real command — the child process keeps the true credential, so the work succeeds — and redacts only the output handed back to the model: the agent *uses* a secret without *seeing* it. File reads are confined to the workspace by default, with optional explicit read roots for trusted user attachments; secrets outside those roots (e.g. `~/.aws`) are covered only by the native-read hook on `enforced` agents.
2. **Agent steering** — a managed instruction tells the agent to use those redacting tools whenever it needs sensitive content.
3. **Native-read hook, where supported** — Codex and Claude Code can block a native read only when Fida detects secret content that the native tool cannot redact, then direct the agent to the gateway.

Normal clean reads, edits, commands, installs, network access, and approvals remain the agent's and developer's concern. Fida's gateway follows the same low-friction rule: it captures and redacts output; it does not apply a command allowlist or repository approval policy.

## What Fida detects

The built-in detector catalog recognizes dotenv assignments, PEM private keys, and high-precision formats for AWS, GitHub, Google, Slack, Stripe, OpenAI, Anthropic, and JWT credentials. It favors precision over recall: a credential in a format Fida does not recognize passes through unredacted. This is best-effort protection against accidental exposure, not a guarantee of zero leakage. Use a dedicated history scanner such as gitleaks or GitGuardian alongside Fida.

Fida fails closed on redaction: if it cannot prove a response is clean, it suppresses that response rather than returning a partial secret.

## Install

```bash
curl -fsSL https://raw.githubusercontent.com/ajipurn/fida/main/install.sh | sh
```

The binary is installed to `~/.local/bin` by default. Run in an interactive terminal, the installer then offers to wire protection for you; otherwise start setup yourself:

```bash
fida
```

Pin a version or choose another install directory:

```bash
FIDA_VERSION=v0.1.0 FIDA_INSTALL_DIR=/usr/local/bin \
  curl -fsSL https://raw.githubusercontent.com/ajipurn/fida/main/install.sh | sh
```

Other options:

```bash
cargo install --git https://github.com/ajipurn/fida fida-cli

git clone https://github.com/ajipurn/fida
cd fida
./install.sh
```

## Everyday commands

```bash
fida                  # protect every detected agent (or, once installed, update)
fida on [agent]       # protect one agent, or all detected agents
fida off [agent]      # remove protection from one agent, or all of them
fida status           # coverage + how many secrets have been protected
fida scan             # find secret risk without printing secret values
fida scan --fail-on high
```

`fida scan` reports whether a raw secret could reach a detected agent. It never prints a secret value, its length, or a fragment of it.

## Agent coverage

| Agent | Coverage |
| --- | --- |
| Codex, Claude Code | `enforced` when the hook and gateway self-test pass |
| Cursor, OpenCode, GitHub Copilot, Windsurf, Antigravity, Kiro | `best_effort` gateway + steering |

`fida status` reports the actual state for each detected agent: `enforced`, `best_effort`, `incomplete`, or `inactive`.

## Scope and limits

Fida protects model-bound content on its installed integration paths. It is not an OS sandbox or a complete data-loss-prevention product. An agent that can ignore steering, bypass a hook, or access a file through an unmediated native tool may still need OS-level containment. Fida names that coverage honestly instead of turning ordinary development into a permission maze.

## Development

```bash
cargo fmt --all --check
cargo clippy --workspace --all-targets -- -D warnings
cargo test --workspace
```

## Security

Please report security-sensitive issues privately when they could expose a secret, bypass redaction, or misrepresent protection coverage. See [SECURITY.md](SECURITY.md).

## License

Licensed under the terms in [LICENSE](LICENSE).

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