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sieve-mcp

MCP server for Sieve — a macOS app that scans local AI coding tool history for secrets leaked into prompts.

sieve-mcp is bundled inside the Sieve Mac app. No separate install. No network calls. All operations run on-device.

Install

  1. Download Sieve for Mac from the App Store.

  2. Open Sieve → Settings → MCP → toggle Enable MCP server on.

Configure Claude Code

Add to ~/.claude/claude_desktop_config.json:

{
  "mcpServers": {
    "sieve": {
      "command": "/Applications/Sieve.app/Contents/MacOS/sieve-mcp"
    }
  }
}

Restart Claude Code and run /mcp to verify sieve appears.

Configure Claude Desktop

Add the same block to ~/Library/Application Support/Claude/claude_desktop_config.json and restart.

Tools

All tools are safe by design — no tool ever returns a plaintext secret value.

sieve_health_status

Returns service health and finding counts.

Response:

{
  "status": "ok",
  "findings_count": 12,
  "scan_jobs": 3
}

sieve_self_test

Verifies scanner rules and transcript source coverage are healthy.

Response:

{
  "fingerprintHealthy": true,
  "ruleCount": "<n>",
  "transcriptSourceCount": "<n>",
  "healthy": true,
  "issues": []
}

sieve_findings_list

Lists findings from the most recent scan.

Input: { "limit": 50 } (optional)

Response:

[
  {
    "findingId": "abc123",
    "ruleId": "github-pat",
    "severity": "critical",
    "sourcePath": "~/.claude/projects/myapp/transcript.jsonl",
    "sourceType": "ClaudeCode",
    "secretFingerprint": "<fingerprint>",
    "previewRedacted": "ghp_[REDACTED]",
    "providerExposureAssumed": true,
    "rotationStatus": "pending",
    "redactionPlaceholder": "sieve://myapp/github-pat"
  }
]

providerExposureAssumed: true — secret found in an AI tool transcript. Assume the provider (Anthropic, OpenAI, etc.) can associate the prompt with your account identity.

sieve_issue_list

Lists scanner health issues — unreadable sources, permission errors, parse failures.

Response:

[
  {
    "issueId": "iss1",
    "code": "SCAN_TARGET_UNREADABLE",
    "severity": "warning",
    "component": "ClaudeDesktop",
    "message": "Could not read chat DB — Full Disk Access may be required",
    "suggestion": "Grant Full Disk Access in System Settings → Privacy & Security"
  }
]

sieve_scan_history

Returns past scan job summaries.

Input: { "limit": 10 } (optional)

Response:

[
  {
    "jobId": "job1",
    "startedAt": "2026-05-22T10:00:00Z",
    "finishedAt": "2026-05-22T10:00:12Z",
    "sourcesCount": 4,
    "findingsCount": 3,
    "issuesCount": 0
  }
]

sieve_scan_status

Returns status of the current or most recent scan.

Response:

{ "status": "idle" }

Values: "idle" · "running" · "completed" · "failed: <reason>"

sieve_check_text

Checks whether text contains secrets. Returns boolean only — never echoes input or detected values.

Input: { "text": "<content to check>" }

Response:

{ "has_secrets": true }

Use this to gate operations before sending content to an external API.

sieve_redact_text

Redacts secrets from text, replacing values with sieve:// placeholders.

Input: { "text": "<content>", "project_key": "myapp" }

Response:

{
  "redacted": "export STRIPE_KEY=sieve://myapp/stripe-secret-key",
  "hadSecrets": true,
  "placeholders": [
    {
      "ruleId": "stripe-secret-key",
      "placeholder": "sieve://myapp/stripe-secret-key",
      "fingerprint": "<fingerprint>"
    }
  ]
}

Raw values are never included in the response.

sieve_vault_run

Executes a command with macOS Keychain-resolved secrets injected as env vars. Secrets never transit the MCP channel.

Input: { "command": "npm run deploy", "fingerprints": ["<fingerprint>"] }

Response:

{
  "exit_code": 0,
  "succeeded": true,
  "timed_out": false,
  "stdout_line_count": 14,
  "stderr_line_count": 0
}

stdout/stderr content is never returned — only line counts.

Supported AI tool sources

Tool

Source

Claude Code

JSONL project transcripts

Claude Desktop

SQLite chat database

Cursor

SQLite state database

VS Code / Copilot Chat

JSON history files

Windsurf

JSON history files

Cline

JSON session files

Codex CLI

JSONL/JSON session files

Gemini CLI

JSON history files

.env files

Selected project roots

Custom sources

User-added folders

Sieve correlates findings across source types — if the same secret appears in both a transcript and a .env file, it is flagged as a multi-source exposure.

Security posture

  • Local-only. stdio transport, no network calls, no cloud sync.

  • No plaintext secrets in responses. Hard invariant in the dispatcher — not configurable.

  • Fingerprint-only persistence. Findings DB stores HMAC fingerprints + redacted previews only.

  • Keychain-backed vault. Secret values live in macOS Keychain with biometric access control.

  • Explicit opt-in. MCP is off by default; requires toggle in Sieve Settings.

  • Unreadable sources reported. SCAN_TARGET_UNREADABLE surfaces in sieve_issue_list — no silent skipping.

Transport

stdio. The sieve-mcp binary reads JSON-RPC 2.0 from stdin and writes to stdout. MCP clients (Claude Code, Claude Desktop) manage the process lifecycle.

Platform

macOS only. Requires Sieve app installed from the Mac App Store.

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