AgentGuard

Stop runaway Python agents before they burn money.

AgentGuard47 is a zero-dependency runtime control SDK for Python agents. Add hard budget caps, loop detection, retry limits, timeouts, local traces, and incident reports without changing agent frameworks or sending data anywhere by default.

Use it when an agent can call tools, retry work, review code, or run long enough to create surprise spend.

pip install agentguard47

Why AgentGuard

Most agent tooling tells you what happened after the run. AgentGuard stops the bad run while it is happening.

Design constraints:

• zero runtime dependencies

• MIT licensed

• local-first by default

• no API key required for local proof

• no network calls unless you configure HttpSink

• guards raise exceptions inside the running process

Real Incidents AgentGuard Prevents

PocketOS — agent deleted prod DB and backups in 9 seconds (May 2026)

A Cursor agent ran a destructive sequence against PocketOS production and wiped the live database. Backups went with it.

Reported root cause from the team's postmortem:

• one API key had write + delete on both prod and backups

• backups lived in the same Railway environment as prod

• no confirmation step before destructive actions

• the agent was given enough rope to chain the calls in one turn

Source: r/devops thread

The "AI did it" framing buries the actual lesson: the blast radius was infra, not the model. AgentGuard does not replace least-privilege creds or isolated backups. It does kill the run before a loop, retry storm, or runaway turn finishes the job.

A BudgetGuard plus LoopGuard wired around the agent loop caps how much it can do in one session:

from agentguard import BudgetGuard, LoopGuard, RateLimitGuard, Tracer

budget = BudgetGuard(max_calls=20, max_cost_usd=1.00)
loop = LoopGuard(max_repeats=2)
rate = RateLimitGuard(max_calls_per_minute=10)
tracer = Tracer(service="cursor-agent", guards=[loop, rate])

with tracer.trace("agent.run"):
    budget.consume(calls=1)
    # tool call here — guards raise on overrun

A 9-second sequence of destructive calls trips LoopGuard or RateLimitGuard long before it finishes. The exception kills the run in-process. Pair this with scoped credentials and out-of-environment backups for the rest of the blast radius.

Local Proof In 60 Seconds

agentguard doctor
agentguard demo
agentguard quickstart --framework raw

doctor verifies the install and local trace writing. demo proves budget, loop, and retry stops offline. quickstart prints the smallest starter for your stack.

Installed-package proof:

agentguard demo

Source-checkout proof with local incident output and hosted-compatible NDJSON:

git clone https://github.com/bmdhodl/agent47.git
cd agent47
PYTHONPATH=sdk python examples/sticky_agent_proof.py --out-dir proof/sticky-agent-proof
agentguard incident proof/sticky-agent-proof/sticky_agent_proof_traces.jsonl

Expected first value moment:

BudgetGuard stops simulated spend.
LoopGuard stops repeated tool calls.
RetryGuard stops a retry storm.
No API keys. No dashboard. No network calls.

Notebook version:

Copy-Paste Repo Setup

Use this when you want a coding agent or teammate to add AgentGuard safely:

pip install agentguard47
agentguard doctor
agentguard quickstart --framework raw --write
python agentguard_raw_quickstart.py
agentguard report .agentguard/traces.jsonl

Optional shared local defaults, saved as .agentguard.json in the repo root:

{
  "profile": "coding-agent",
  "service": "my-agent",
  "trace_file": ".agentguard/traces.jsonl",
  "budget_usd": 5.0
}

Keep the first PR local-only. Add hosted ingest later only when retained incidents, alerts, or team visibility matter.

Quickstart: Guard One Agent Run

from agentguard import BudgetGuard, JsonlFileSink, LoopGuard, Tracer

budget = BudgetGuard(max_cost_usd=5.00, max_calls=50, warn_at_pct=0.8)
loop = LoopGuard(max_repeats=3)
tracer = Tracer(
    sink=JsonlFileSink(".agentguard/traces.jsonl"),
    service="support-agent",
    guards=[loop],
)

with tracer.trace("agent.run") as span:
    budget.consume(calls=1, cost_usd=0.02)
    loop.check("search", {"query": "refund policy"})
    span.event("tool.call", data={"tool": "search", "query": "refund policy"})
    # Call your agent or tool here.

Inspect the local proof:

agentguard report .agentguard/traces.jsonl
agentguard incident .agentguard/traces.jsonl

Auto-Patch Provider SDKs

If you already call OpenAI or Anthropic directly, patch once and keep using the provider normally:

from agentguard import BudgetGuard, Tracer, patch_openai

budget = BudgetGuard(max_cost_usd=5.00, warn_at_pct=0.8)
tracer = Tracer(service="support-agent")
patch_openai(tracer, budget_guard=budget)

# OpenAI chat completions are now traced and budget-enforced.

When accumulated cost crosses the hard limit, BudgetExceeded is raised and the agent stops.

Guards

Guards are static runtime checks. They do not ask another model whether a run is safe. They raise exceptions.

Examples

All examples are local-first. No API key is required unless the example says so.

Sample incident: docs/examples/coding-agent-review-loop-incident.md

Proof gallery: docs/examples/proof-gallery.md

Starter files: examples/starters/

Framework Integrations

AgentGuard can wrap raw Python code or integrate with common agent stacks.

agentguard quickstart --framework raw
agentguard quickstart --framework openai
agentguard quickstart --framework anthropic
agentguard quickstart --framework langchain
agentguard quickstart --framework langgraph
agentguard quickstart --framework crewai

Optional integration extras are opt-in. The core SDK stays stdlib-only.

pip install "agentguard47[langchain]"
pip install "agentguard47[langgraph]"
pip install "agentguard47[crewai]"
pip install "agentguard47[otel]"

Runtime Control vs Observability

AgentGuard is not a generic tracing platform. It is the local runtime stop layer.

Competitive notes:

• AgentGuard vs Vercel AI Gateway

• Where AgentGuard fits in the agent security stack

Decision Traces

Capture proposal, human edit, approval, override, and binding events through the same event pipeline:

from agentguard import JsonlFileSink, Tracer, decision_flow

tracer = Tracer(sink=JsonlFileSink(".agentguard/traces.jsonl"))

with tracer.trace("agent.run") as run:
    with decision_flow(
        run,
        workflow_id="deploy-review",
        object_type="pull_request",
        object_id="123",
        actor_type="human",
        actor_id="pat",
    ) as decision:
        decision.proposed({"action": "merge"})
        decision.approved(comment="Looks safe")
        decision.bound(binding_state="merged", outcome="success")

Supported event types:

• decision.proposed

• decision.edited

• decision.overridden

• decision.approved

• decision.bound

Guide: docs/guides/decision-tracing.md

MCP Server

AgentGuard also ships a read-only MCP server for coding-agent workflows:

npx -y @agentguard47/mcp-server

Use the SDK to enforce local safety where the agent runs. Use MCP when a client like Codex, Claude Code, or Cursor needs read access to traces, decisions, costs, usage, and budget health.

Hosted Dashboard Boundary

The SDK is the free local proof path. The hosted dashboard is for retained history, alerts, team visibility, spend trends, hosted decision history, and dashboard-managed remote kill signals.

Start local. Add hosted ingest when the work becomes shared, expensive, or risky enough that local files are no longer enough.

from agentguard import HttpSink, Tracer

tracer = Tracer(
    sink=HttpSink(
        url="https://app.agentguard47.com/api/ingest",
        api_key="ag_...",
    )
)

HttpSink mirrors trace and decision events to the dashboard. It does not execute remote kill signals by itself.

Dashboard contract: docs/guides/dashboard-contract.md

Reports And CI Gates

Generate a local incident report:

agentguard incident .agentguard/traces.jsonl --format markdown
agentguard incident .agentguard/traces.jsonl --format html

Fail CI when a trace violates safety expectations:

from agentguard import EvalSuite

result = (
    EvalSuite(".agentguard/traces.jsonl")
    .assert_no_loops()
    .assert_budget_under(tokens=50_000)
    .assert_no_errors()
    .run()
)

assert result.passed

Package Facts

• Package: agentguard47

• Python: 3.9+

• License: MIT

• Core runtime dependencies: zero

• Trace format: JSONL

• Local commands: doctor, demo, quickstart, report, incident, eval

• MCP package: @agentguard47/mcp-server

Docs

Architecture

agent code
   |
   v
Tracer
   |
   +-- guards raise exceptions locally
   |
   +-- sinks write traces locally or mirror to hosted ingest

Repository layout:

sdk/          Python SDK package
mcp-server/   read-only MCP server
docs/         guides and competitive notes
examples/     runnable local examples
ops/          repo operating docs
memory/       SDK-only state and decisions

Security

• No secrets are required for local mode.

• Do not put API keys in .agentguard.json.

• Hosted ingest API keys should be stored in environment variables.

• Local guards remain authoritative even when hosted ingest is configured.

Report security issues through GitHub Security Advisories or by email: pat@bmdpat.com.

Contributing

Contributions are welcome when they keep the SDK small, local-first, and zero-dependency.

Before opening a PR:

python -m pytest sdk/tests/ -v
python -m ruff check sdk/agentguard/
python scripts/sdk_release_guard.py

Useful links:

• CONTRIBUTING.md

• GOLDEN_PRINCIPLES.md

• good first issues

License

MIT. See LICENSE.