agentic-chaos 0.2.0

Standalone fault injection toolkit for LLM calls and agentic workflows, with an optional AgenticLens integration.

agentic-chaos

agentic-chaos is a standalone fault-injection toolkit for LLM calls and agentic workflows. It deliberately breaks your app — hung completions, provider rate-limit storms, silently corrupted output — and reports what happened. It has no required dependency on any other package, including AgenticLens: pip install agentic-chaos and use it against any plain Python callable.

If you also use AgenticLens, an optional integration lets you merge chaos events straight into an AgenticLens Workflow, so agenticlens analyze reports on cost/latency and chaos impact together — see Optional: AgenticLens Integration below. Neither package imports the other at the core level; the two are independent tools that happen to compose.

Status

agentic-chaos is early-stage software. The LLM Chaos Toolkit (v0.1) and Agent Failure Injector (v0.2) are shipped. Planned next: a Prompt/Model Drift Detector (v0.3). See ROADMAP.md for the full plan.

Installation

pip install agentic-chaos

or, from source with uv:

git clone https://github.com/DeepAgentLabs/agentic-chaos.git
cd agentic-chaos
uv sync --extra dev --frozen

That's it — no other package required. (If you want the optional AgenticLens integration too, see below.)

--frozen matters here: pyproject.toml points the (currently unpublished) agenticlens extra at a sibling checkout via [tool.uv.sources], and uv sync without --frozen tries to validate/refresh the entire lock — every extra, including ones you didn't ask for — which fails if that sibling directory doesn't exist. --frozen installs straight from the committed uv.lock instead. Drop it (and check out agenticlens as a sibling directory) only if you're working on the optional integration itself — see Development.

Quickstart

Wrap the calls you want to be fragile with chaos_call():

from agentic_chaos.chaos import chaos_call, TokenTimeoutError

try:
    chunks = chaos_call(retriever.search, user_question, faults=["token_timeout"])
except TokenTimeoutError:
    chunks = []  # no fallback handled it -- this is exactly what we want to find

Outside of a chaos_session(...), chaos_call() is a transparent pass-through — fn(*args, **kwargs) runs exactly as if agentic-chaos weren't there. So the same instrumented code path is safe to ship; chaos only activates when you explicitly turn it on.

Run the script under chaos from the CLI, choosing which faults are active without touching the code:

uv run agentic-chaos chaos run my_app.py --inject token_timeout,rate_limit_storm --save chaos_run.json

                                  Chaos Events
  Step        Fault           Outcome    Message
 ────────────────────────────────────────────────────────────────────────────
  Retriever   token_timeout   errored    call hung for 2.0s then timed out

1 chaos event(s) recorded.

Saved chaos report to chaos_run.json

chaos_run.json is this package's own standalone report — no other library needed to produce or read it.

Fault Types (v0.1)

Fault	--inject name	What it does
Token timeout	token_timeout	Hangs for hang_seconds (default 2.0s), then raises TokenTimeoutError — simulates a client-side timeout on a hung/slow completion. Pass mode="delay" to let the real call complete late instead of erroring.
Rate-limit storm	rate_limit_storm	Raises RateLimitStormError (with a retry_after hint) for the first burst_count calls (default 3), then passes calls through normally — simulates a provider 429/backoff cascade that eventually clears.
Silent degradation	silent_degradation	Calls the real function, then corrupts its text content (.content/.text/a raw string) while preserving latency and token counts. The hardest fault to detect and the highest-value one to catch — nothing in cost/latency telemetry looks wrong.

Every fault records a ChaosEvent (fault_type, outcome, and — when you pass step_id/step_name — the correlation you chose). Use the Python API to override defaults per fault:

from agentic_chaos.chaos import chaos_session, TokenTimeoutFault, RateLimitStormFault

with chaos_session([TokenTimeoutFault(hang_seconds=5.0), RateLimitStormFault(burst_count=1)]):
    ...

When more than one fault is configured for a session, chaos_call() requires you to pass faults=[...] at each call site to say which one applies there — silently picking one for you would be surprising.

Two options worth knowing about that don't show up in the table above (see examples/chaos_advanced_faults_demo.py for both, runnable):

• TokenTimeoutFault(mode="delay") — the call still succeeds, just late, instead of raising TokenTimeoutError. Recorded outcome is "delayed". Useful for testing whether a slow-but-successful call degrades UX on its own, separate from outright failure.
• SilentDegradationFault(degrade_fn=my_fn) — swap in your own corruption logic (my_fn(result) -> corrupted_result) instead of the built-in text garbler, e.g. to simulate a narrower, more realistic bug than wholesale noise.

CLI Reference

# Run a script with LLM-level chaos active and print a chaos-events report.
agentic-chaos chaos run my_app.py --inject token_timeout,rate_limit_storm

# Same, saving the resulting standalone report for later inspection.
agentic-chaos chaos run my_app.py --inject silent_degradation --save chaos_run.json

# Run a script with agent-level faults.
agentic-chaos agent run my_agent.py --inject tool_failure,memory_corruption --save report.json

# List all available fault types (v0.1 + v0.2).
agentic-chaos chaos list-faults

agentic-chaos drift ... is a placeholder for the v0.3 module — running it today prints a pointer to ROADMAP.md.

Agent Failure Injector (v0.2)

Three agent-level fault types for testing multi-agent resilience:

Fault	--inject name	What it does
Tool-call failure	tool_failure	Forces a tool call to error ("error"), timeout ("timeout"), or return null ("empty"). Use tool_name="search" to target a specific tool; None targets all.
Memory corruption	memory_corruption	Corrupts shared agent state: "truncate" cuts to half, "inject" inserts garbage, "garble" replaces text with random letters.
Infinite loop	infinite_loop	Replaces the agent's return value with a "continue" signal for force_turns calls, then passes through. Tests whether your agent has turn-limit safeguards.

wrap_tool() / wrap_node() + TopologyTracker

Wrap tool and node functions for transparent chaos injection and topology recording:

from agentic_chaos import (
    ToolCallFailureFault, TopologyTracker, chaos_session, wrap_tool
)

tracker = TopologyTracker()
tracker.register_node("SupportAgent", type="agent")

search = wrap_tool(search_fn, tool_name="search", tracker=tracker, caller_node="SupportAgent")
refund = wrap_tool(refund_fn, tool_name="refund", tracker=tracker, caller_node="SupportAgent")

with chaos_session([ToolCallFailureFault(tool_name="search")]):
    search("order #123")   # fault fires — tool_name matches
    refund("123")           # passes through — different tool

print(tracker.topology.as_json())  # nodes + edges

Examples

Script	Needs	Shows
examples/chaos_customer_support_demo.py	nothing but agentic_chaos	All three v0.1 faults' default behavior in one flow: a rate-limit storm the app retries through and recovers from, a token timeout it doesn't handle (fails outright), and a silent degradation (normal-looking call, corrupted output).
examples/chaos_advanced_faults_demo.py	nothing but agentic_chaos	TokenTimeoutFault(mode="delay") and a custom SilentDegradationFault(degrade_fn=...).
examples/chaos_agent_failure_demo.py	nothing but agentic_chaos	All three v0.2 agent faults: tool-call failure, memory corruption, infinite loop. Plus wrap_tool() and TopologyTracker.
examples/chaos_with_agenticlens_demo.py	agentic-chaos[agenticlens]	The optional integration: attach_events() + step_kwargs() merging chaos events onto a real AgenticLens Workflow.

Run any of them directly (uv run python examples/...), or the first two under the CLI:

uv run agentic-chaos chaos run examples/chaos_customer_support_demo.py \
    --inject rate_limit_storm,token_timeout,silent_degradation --save /tmp/chaos_run.json

Optional: AgenticLens Integration

If you also use AgenticLens to profile cost/latency, install the extra:

pip install agentic-chaos[agenticlens]

Then correlate chaos events to AgenticLens steps and merge them onto the Workflow yourself:

from agenticlens import profile, step
from agenticlens.exporters import JSONExporter
from agentic_chaos.chaos import chaos_call, chaos_session, TokenTimeoutError
from agentic_chaos.integrations.agenticlens import attach_events, step_kwargs

with chaos_session(["token_timeout"]) as session:
    with profile("Customer Support Agent") as workflow:
        with step("Retriever", type="retriever", chunk_count=4) as s:
            try:
                chunks = chaos_call(retriever.search, user_question, **step_kwargs(s))
            except TokenTimeoutError:
                chunks = []
    attach_events(session, workflow)

JSONExporter().export(workflow, "workflow.json")

agenticlens analyze workflow.json

Optimization Suggestions
  * Chaos impact: token_timeout on 'Retriever'
    -- Injected fault 'token_timeout' hit step 'Retriever' 1 time and the call
       raised an error each time (call hung for 2.0s then timed out). ... (~0 tokens)

agentic_chaos.chaos_call()/chaos_session() and the CLI never import AgenticLens — only agentic_chaos.integrations.agenticlens does, and only when you import it yourself. See examples/chaos_with_agenticlens_demo.py for a runnable version of the above.

This works because agentic-chaos's own report format (ChaosReport) and AgenticLens's chaos_events field share a documented JSON shape (schema v1.1, see docs/workflow-schema-spec.md in the agenticlens repo) — interop through a shared file format, not a code dependency in either direction.

Development

Without a sibling agenticlens checkout, use --frozen (see Installation for why):

uv sync --extra dev --frozen
uv run --frozen pytest
uv run --frozen ruff check .
uv run --frozen ruff format .
uv run --frozen mypy

Tests covering agentic_chaos.integrations.agenticlens skip automatically if agenticlens isn't installed. To run the full suite including those, clone agenticlens as a sibling directory and sync with the optional extra (dropping --frozen, since now you want the lock to pick it up):

git clone https://github.com/DeepAgentLabs/agenticlens.git ../agenticlens
uv sync --extra dev --extra agenticlens
uv run pytest

(see [tool.uv.sources] for the local sibling-checkout override used until agenticlens publishes a release with chaos_events support).

License

MIT — see LICENSE.