Haldir

<!-- mcp-name: io.github.ExposureGuard/haldir -->

Haldir — The Guardian Layer for AI Agents

         

The open-source governance layer for AI agents. Identity, secrets, audit, and policy enforcement — MIT licensed, self-host or use our cloud.

Haldir enforces governance on every AI agent tool call: scoped sessions with spend caps, encrypted secrets the model never sees, hash-chained tamper-evident audit trail, human-in-the-loop approvals, and a proxy that intercepts every MCP call before it reaches your tools. Native SDKs for LangChain, CrewAI, AutoGen, and Vercel AI SDK.

<p align="center"> <img src="demo/quickstart.svg" alt="Haldir quickstart: install, create a scoped session, check permission, log the action to the hash-chained audit trail" width="780"> </p>

<p align="center"> <img src="docs/architecture.svg" alt="Haldir architecture: Agent → Proxy → (Gate/Vault/Watch/Policy) → Upstream APIs" width="820"> </p>

CLI

$ haldir overview

  Haldir tenant overview
  acct_xyz123  ·  tier pro  ·  2026-04-19T18:42:11+00:00

  Status     ● ok
  Actions      4,217 / 50,000   ████░░░░░░░░░░░░░░░░    8.4%
  Spend      $ 47.30 this month
  Sessions        12 active  ·  3/10 agents
  Vault            8 secrets  ·  62 accesses this month
  Audit        1,847 entries  ·  0 flagged (7d)  ·  chain ✓
  Webhooks         2 registered  ·  541 deliveries (24h)  ·  99.82% success
  Approvals        1 pending

Install once, drive the whole platform from the terminal:

pip install haldir
haldir login                           # one-time; stashes API key
haldir overview --watch                # top-style live dashboard
haldir status                          # green/yellow/red component pills
haldir ready                           # exits 0/1, perfect for CI
haldir audit tail --agent my-bot       # the last N entries
haldir audit export --format=jsonl --out audit-2026-04.jsonl
haldir audit verify                    # hash chain integrity check
haldir webhooks deliveries             # last 20 retry attempts
haldir migrate up                      # apply pending schema migrations

Every command takes --json for scripts. haldir --help for the full surface.

Two ways to run Haldir

| | Self-host | Cloud (haldir.xyz) | |---|---|---| | Price | Free forever | Free tier + paid plans | | Features | Everything | Everything — same API, same SDKs | | You run | API + Postgres | Nothing | | Best for | Regulated industries, air-gapped, "must own data" | "Just make it work" |

Self-host in 5 minutes

git clone https://github.com/ExposureGuard/haldir.git
cd haldir
cp .env.example .env
python3 -c 'import base64, os; print(base64.urlsafe_b64encode(os.urandom(32)).decode())'
# paste the output into .env as HALDIR_ENCRYPTION_KEY, then:
docker compose up -d
curl http://localhost:8000/health

Full self-hosting guide: SELF_HOSTING.md

Or use our cloud

pip install haldir

That's it — point at https://haldir.xyz, no signup, live API.

---

Live now: haldir.xyz · API Docs · OpenAPI Spec · Smithery 🧪 Now accepting 5 design partners. 30 days free, full access, direct line to the founder. If you're shipping AI agents to production, email sterling@haldir.xyz.

Performance

Haldir is fast enough to sit in the hot path of every agent tool call without becoming the bottleneck.

Single-box HTTP throughput (gunicorn 4 workers, 32 concurrent clients, tuned SQLite backend, every request goes through the full middleware stack — auth, validation, idempotency, metrics, structured logging):

| Endpoint | RPS | p50 | p95 | p99 | | --- | --- | --- | --- | --- | | GET /healthz | 1,638 | 19.1 ms | 32.5 ms | 41.6 ms | | GET /v1/status | 1,382 | 22.2 ms | 30.8 ms | 45.4 ms | | GET /v1/sessions/:id | 903 | 29.2 ms | 95.5 ms | 172.1 ms | | POST /v1/sessions (create) | 1,142 | 27.7 ms | 35.2 ms | 39.9 ms | | POST /v1/audit (hash-chain write) | 1,092 | 28.7 ms | 37.6 ms | 52.6 ms |

Hardware: 12th-gen Intel Core i3-1215U (8 cores, 8 GB RAM). SQLite is configured with WAL + synchronous=NORMAL + 256 MiB mmap + in-memory temp store — the session-lookup p99 dropped by 52 % versus the untuned path. Postgres deployments (configurable pool via HALDIR_PG_POOL_MIN/MAX) flatten the p99 further still; enable via DATABASE_URL=postgresql://....

Primitive cost (pure-Python, no I/O):

| Primitive | p50 | Notes | |---|---|---| | Vault.store_secret (AES-256-GCM encrypt + AAD binding) | < 10 µs | in-memory, no DB write | | Vault.get_secret (AES-256-GCM decrypt + AAD verify) | < 10 µs | in-memory | | AuditEntry.compute_hash (SHA-256 over canonical payload) | < 10 µs | | | Gate.check_permission over REST | ~50-120 ms | network + DB round-trip, Cloudflare-fronted | | Watch.log_action over REST | ~50-150 ms | includes chain lookup + DB write | | Full governed-tool envelope (check + log) | ~100-250 ms | |

Agents typically wait 500-3000 ms for an LLM completion and 100-1000 ms for an upstream API call, so Haldir's overhead sits inside the noise. Reproduce locally:

# Concurrent HTTP throughput (launches a local gunicorn, ~60s total)
python bench/bench_http.py --duration 10 --concurrency 32 --workers 4

# Primitive cost only (no API key needed)
python bench/bench_primitives.py --local

# End-to-end against the hosted service
export HALDIR_API_KEY=hld_...
python bench/bench_primitives.py

Compliance

One endpoint produces an auditor-ready proof-of-control pack covering eight sections, each anchored to a SOC2 trust services criterion:

haldir compliance evidence --since 2026-01-01 --out evidence-q1-2026.md

| # | Section | SOC2 | | --- | --- | --- | | 1 | Identity (tenant, subscription, period) | — | | 2 | Access control (API keys + per-key scopes) | CC6.1 | | 3 | Encryption (AES-256-GCM, AAD binding) | CC6.7 | | 4 | Audit trail (entry count, hash chain integrity) | CC7.2 | | 5 | Spend governance (per-session caps, payment records) | CC5.2 | | 6 | Human approvals (request/decision lifecycle) | CC8.1 | | 7 | Outbound alerting (webhook delivery success rate) | CC7.3 | | 8 | Document signature (SHA-256 self-hash) | — |

The pack signs itself: a SHA-256 over the canonical JSON of sections 1-7. An auditor receiving an archived pack can re-call /v1/compliance/evidence/manifest and confirm the digest matches — proof the document was not modified after issuance.

JSON for evidence-locker upload, Markdown for the "show this to the auditor" moment, both from the same /v1/compliance/evidence endpoint.

Why Haldir

AI agents are calling APIs, spending money, and accessing credentials with zero oversight. Haldir is the missing layer:

| Without Haldir | With Haldir | |---|---| | Agent has unlimited access | Scoped sessions with permissions | | Secrets in plaintext env vars | AES-encrypted vault with access control | | No spend limits | Per-session budget enforcement | | No record of what happened | Immutable audit trail | | No human oversight | Approval workflows with webhooks | | Agent talks to tools directly | Proxy intercepts and enforces policies |

Quick Start

pip install haldir

from sdk.client import HaldirClient

h = HaldirClient(api_key="hld_xxx", base_url="https://haldir.xyz")

# Create a governed agent session
session = h.create_session("my-agent", scopes=["read", "spend:50"])

# Store secrets agents never see directly
h.store_secret("stripe_key", "sk_live_xxx")

# Retrieve with scope enforcement
key = h.get_secret("stripe_key", session_id=session["session_id"])

# Authorize payments against budget
h.authorize_payment(session["session_id"], 29.99)

# Every action is logged
h.log_action(session["session_id"], tool="stripe", action="charge", cost_usd=29.99)

# Revoke when done
h.revoke_session(session["session_id"])

Products

Gate — Agent Identity & Auth

Scoped sessions with permissions, spend limits, and TTL. No session = no access.

curl -X POST https://haldir.xyz/v1/sessions \
  -H "Authorization: Bearer hld_xxx" \
  -H "Content-Type: application/json" \
  -d '{"agent_id": "my-bot", "scopes": ["read", "browse", "spend:50"], "ttl": 3600}'

Vault — Encrypted Secrets & Payments

AES-encrypted storage. Agents request access; Vault checks session scope. Payment authorization with per-session budgets.

curl -X POST https://haldir.xyz/v1/secrets \
  -H "Authorization: Bearer hld_xxx" \
  -H "Content-Type: application/json" \
  -d '{"name": "api_key", "value": "sk_live_xxx", "scope_required": "read"}'

Watch — Audit Trail & Compliance

Immutable log for every action. Anomaly detection. Cost tracking. Compliance exports.

curl https://haldir.xyz/v1/audit?agent_id=my-bot \
  -H "Authorization: Bearer hld_xxx"

Proxy — Enforcement Layer

Sits between agents and MCP servers. Every tool call is intercepted, authorized, and logged. Supports policy enforcement: allow lists, deny lists, spend limits, rate limits, time windows.

# Register an upstream MCP server
curl -X POST https://haldir.xyz/v1/proxy/upstreams \
  -H "Authorization: Bearer hld_xxx" \
  -H "Content-Type: application/json" \
  -d '{"name": "myserver", "url": "https://my-mcp-server.com/mcp"}'

# Call through the proxy — governance enforced
curl -X POST https://haldir.xyz/v1/proxy/call \
  -H "Authorization: Bearer hld_xxx" \
  -H "Content-Type: application/json" \
  -d '{"tool": "scan_domain", "arguments": {"domain": "example.com"}, "session_id": "ses_xxx"}'

Approvals — Human-in-the-Loop

Pause agent execution for human review. Webhook notifications. Approve or deny from dashboard or API.

# Require approval for spend over $100
curl -X POST https://haldir.xyz/v1/approvals/rules \
  -H "Authorization: Bearer hld_xxx" \
  -H "Content-Type: application/json" \
  -d '{"type": "spend_over", "threshold": 100}'

MCP Server

Haldir is available as an MCP server with 10 tools for Claude, Cursor, Windsurf, and any MCP-compatible AI:

{
  "mcpServers": {
    "haldir": {
      "command": "haldir-mcp",
      "env": {
        "HALDIR_API_KEY": "hld_xxx"
      }
    }
  }
}

MCP Tools: createSession, getSession, revokeSession, checkPermission, storeSecret, getSecret, authorizePayment, logAction, getAuditTrail, getSpend

MCP HTTP Endpoint: POST https://haldir.xyz/mcp

Architecture

Agent (Claude, GPT, Cursor, etc.)
    │
    ▼
┌─────────────────────────────┐
│       Haldir Proxy          │  ← Intercepts every tool call
│  Policy enforcement layer   │
└──────┬──────────┬───────────┘
       │          │
  ┌────▼────┐ ┌───▼────┐
  │  Gate   │ │ Watch  │
  │identity │ │ audit  │
  │sessions │ │ costs  │
  └────┬────┘ └────────┘
       │
  ┌────▼────┐
  │ Vault   │
  │secrets  │
  │payments │
  └────┬────┘
       │
       ▼
  Upstream MCP Servers
  (your actual tools)

API Reference

Full docs at haldir.xyz/docs

| Endpoint | Method | Description | |---|---|---| | /v1/keys | POST | Create API key | | /v1/sessions | POST | Create agent session | | /v1/sessions/:id | GET | Get session info | | /v1/sessions/:id | DELETE | Revoke session | | /v1/sessions/:id/check | POST | Check permission | | /v1/secrets | POST | Store secret | | /v1/secrets/:name | GET | Retrieve secret | | /v1/secrets | GET | List secrets | | /v1/secrets/:name | DELETE | Delete secret | | /v1/payments/authorize | POST | Authorize payment | | /v1/audit | POST | Log action | | /v1/audit | GET | Query audit trail | | /v1/audit/spend | GET | Spend summary | | /v1/approvals/rules | POST | Add approval rule | | /v1/approvals/request | POST | Request approval | | /v1/approvals/:id | GET | Check approval status | | /v1/approvals/:id/approve | POST | Approve | | /v1/approvals/:id/deny | POST | Deny | | /v1/approvals/pending | GET | List pending | | /v1/webhooks | POST | Register webhook | | /v1/webhooks | GET | List webhooks | | /v1/proxy/upstreams | POST | Register upstream | | /v1/proxy/tools | GET | List proxy tools | | /v1/proxy/call | POST | Call through proxy | | /v1/proxy/policies | POST | Add policy | | /v1/usage | GET | Usage stats | | /v1/metrics | GET | Platform metrics |

Agent Discovery

Haldir is discoverable through every major protocol:

| URL | Protocol | |---|---| | haldir.xyz/openapi.json | OpenAPI 3.1 | | haldir.xyz/llms.txt | LLM-readable docs | | haldir.xyz/.well-known/ai-plugin.json | ChatGPT plugins | | haldir.xyz/.well-known/mcp/server-card.json | MCP discovery | | haldir.xyz/mcp | MCP JSON-RPC | | smithery.ai/server/haldir/haldir | Smithery registry | | pypi.org/project/haldir | PyPI |

License

MIT

Links

• Website: haldir.xyz
• API Docs: haldir.xyz/docs
• Smithery: View on Smithery
• PyPI: haldir
• OpenAPI: haldir.xyz/openapi.json