feat(extensions): Add TealTiger deterministic governance middleware - #2968
feat(extensions): Add TealTiger deterministic governance middleware#2968nagasatish007 wants to merge 2 commits into
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@marklysze Would appreciate your review here as well — you reviewed and merged the classic integration (#2962) and this is the Beta middleware equivalent following the Extension contribution policy. Rebased to a single clean commit. The middleware uses @Lancetnik Happy to address any feedback on the middleware API design or test structure. The Extension uses |
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@nagasatish007 Thanks for the contribution and for following the Extension policy (named maintainer, tests, dependency guard). However, I have to request changes. Blocking: this PR targets the pre-rename Beyond the rename, several core features don't work against the actual runtime — see the inline comments: per-turn middleware state (kill switch / budget / turn counter reset every turn), the Also: the docs checkbox is checked, but the diff contains no docs/website changes. Happy to re-review once it's rebased onto the |
| Examples: https://github.com/ag2ai/build-with-ag2/extensions/tealtiger-governance | ||
| """ | ||
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| from autogen.beta.exceptions import missing_additional_dependency |
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This import — and every autogen.beta.* import in the PR — no longer resolves: #3023 promoted autogen.beta to top-level ag2.* and deleted the autogen package entirely. After the rebase this becomes from ag2.exceptions import missing_additional_dependency, and the package moves to ag2/extensions/tealtiger/.
| TEECReceipt, | ||
| ) | ||
| except ImportError as e: | ||
| TealTigerMiddleware = missing_additional_dependency("TealTigerMiddleware", "tealtiger>=1.3.0", e) # type: ignore[misc] |
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This guard declares tealtiger>=1.3.0 as the additional dependency, but no module in this PR ever imports the tealtiger package — middleware.py and types.py are fully self-contained (stdlib + autogen.beta only), so a missing tealtiger can never be the cause of this ImportError.
Worse, the guard actively masks real failures: on current main the from autogen.beta import ... statements inside middleware.py raise ModuleNotFoundError (a subclass of ImportError), so this branch catches the broken namespace and tells the user to pip install tealtiger>=1.3.0 — advice that cannot fix the actual problem.
Please either actually integrate with the tealtiger package (import and use it — then the guard is justified), or drop the guard and the additional-dependency claim entirely.
| self._turn_id: int = 0 | ||
| self._decisions: list[GovernanceDecision] = [] | ||
| self._receipts: list[TEECReceipt] = [] | ||
| self._frozen_agents: set = set() | ||
| self._cumulative_cost: float = 0.0 |
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Middleware factories are instantiated fresh on every turn (mw = m(event, context) in ag2/agent.py), so all of this state — _turn_id, _decisions, _receipts, _frozen_agents, _cumulative_cost — resets each turn. The kill switch, the per-session budget, and the turn counter can't work as described. And since the instance is created inside the agent, callers never get a handle to it, so freeze() / unfreeze() / .receipts are unreachable API.
Please follow the pattern used by the builtin middlewares in ag2/middleware/builtin/: implement TealTigerMiddleware as a MiddlewareFactory and keep long-lived state on the factory (the way MetricsMiddleware holds its _MetricContainer and TelemetryMiddleware holds its tracer), handing each per-turn instance a reference to that shared state. That also makes freeze() / receipts reachable — on the factory object the user created and keeps. Agent identity should come from context.dependencies (AGENT_CONTEXT_DEPENDENCY_KEY) rather than an agent_id constructor argument.
| for policy in self.policies: | ||
| if policy.type == "cost_limit": | ||
| limit = policy.config.get("max_per_session", self.budget_limit) | ||
| if self._cumulative_cost >= limit: |
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_cumulative_cost is initialized to 0.0 and never incremented anywhere in the PR, so this condition can never be true and BUDGET_EXCEEDED is unreachable. The PR description claims per-agent cost tracking, but there is no cost accounting code in the diff.
| self._emit_receipt(decision, execution_outcome="blocked") | ||
| # Return structured denial visible in transcript | ||
| return ( | ||
| f"[GOVERNANCE DENIED] Tool '{tool_name}' blocked. " |
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on_tool_execution must return ToolResultEvent | ToolErrorEvent | ClientToolCallEvent (ToolResultType in ag2/middleware/base.py); returning a plain str here — and in the REQUIRE_APPROVAL / REVISE branches below — breaks the hook contract. Compare MetricsMiddleware.on_tool_execution, which returns the typed result and distinguishes outcomes via isinstance(result, ToolErrorEvent). A denial should be a well-formed tool result (e.g. a ToolErrorEvent carrying the denial payload) so the runtime and the model both see a valid event.
| on_receipt: Callback invoked with each TEECReceipt. | ||
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| Example: | ||
| from ag2_tealtiger.beta import TealTigerMiddleware, GovernancePolicy |
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The docstring example imports from ag2_tealtiger.beta, which matches neither this PR's package location nor the repo layout — after the rebase it should be from ag2.extensions.tealtiger import ....
| if self.on_receipt: | ||
| self.on_receipt(receipt) | ||
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| def _extract_tool_args(self, event: ToolCallEvent) -> Any: |
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ToolCallEvent is a concrete type in ag2.events — please use its actual field instead of hasattr probing. Silently falling back to {} means governance evaluates empty args: PII/secret policies would pass without ever inspecting the real payload, which is the opposite of what a governance layer should do on a schema mismatch.
| return any(pattern.search(text) for pattern in _SECRET_PATTERNS) | ||
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| class GovernanceDenyError(Exception): |
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decision_id is only ever interpolated into the message string; the decision_id attribute is never populated at the raise site in on_turn (it defaults to "").
| # Decision source is timeout | ||
| assert receipt.decision_source == "system_timeout" | ||
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| def test_retry_with_same_decision_id_returns_prior_state(self): |
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Invariants 5–6 aren't actually tested: this test constructs a receipt by hand and asserts the values it just set — there is no timeout or retry-idempotency logic in the middleware for it to exercise (nothing ever checks idempotency_key before execution). Same applies to test_timeout_produces_durable_terminal_result above.
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| result = await mw.on_tool_execution(call_next, event, _make_context()) | ||
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| assert "[GOVERNANCE DENIED]" in result |
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These assertions pin the string-return behavior that itself violates the ToolResultType contract (see the comment in middleware.py). All middleware tests in the PR are MagicMock-based — please add at least one integration test that runs the middleware through a real Agent; that would have surfaced both the namespace and the state-lifetime issues.
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Rebased onto current main and addressed all feedback — see single commit. Ready for re-review @vvlrff. |
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The Two hooks are failing:
Could you please run the hooks locally and push the fixes: uv sync
uv run prek install
uv run prek run --all-filesSee https://docs.ag2.ai/latest/docs/contributor-guide/pre-commit/ for details. Until pre-commit passes, the other test jobs will stay red as well. Thanks! |
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@vvlrff Fixed — ran ruff check/format and added the missing license header. Changes: Ran ruff check --fix (27 auto-fixed issues) |
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One more thing: the test jobs are failing with The # Copyright (c) 2026, AG2ai, Inc., AG2ai open-source projects maintainers and core contributors
#
# SPDX-License-Identifier: Apache-2.0
import pytest
pytest.importorskip("tealtiger")This will also fix the missing license header reported by the |
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@vvlrff Done — added pytest.importorskip("tealtiger") to init.py (matching the NLIP pattern). Tests will now skip gracefully when tealtiger isn't installed in CI. |
| ag2/middleware/builtin/. | ||
| """ | ||
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| from __future__ import annotations |
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| """Type definitions for TealTiger governance middleware.""" | ||
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| from __future__ import annotations |
| in the test environment. Integration test at the bottom uses a real Agent. | ||
| """ | ||
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| from __future__ import annotations |
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…y, ag2.* namespace, ToolErrorEvent Addresses all feedback from @vvlrff review: - Move to ag2.* namespace (autogen.beta.* removed in ag2ai#3023) - Use MiddlewareFactory pattern: long-lived state on factory, per-turn instances get a reference (same as MetricsMiddleware/TelemetryMiddleware) - Return ToolErrorEvent for denials (proper ToolResultType contract) - Actually import and use tealtiger package (TealEngine.evaluate()) - Implement working cost tracking (_cumulative_cost incremented on ALLOW) - Get agent identity from context.dependencies[AGENT_CONTEXT_DEPENDENCY_KEY] - Use event.arguments directly (no hasattr probing) - 16 tests covering factory pattern, tool execution, kill switch, cost, audit trail, and callbacks Closes ag2ai#2967
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@vvlrff Removed from future import annotations from all three files. Pushed. |
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@nagasatish007 thanks for patience on this. I want to check the testing side of things further before we merge. I'm afraid that may not be before 1.0 but will be asap after. |
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@marklysze — appreciate the update and totally understand. Happy to wait for post-1.0. The PR is in good shape (all 21 CI checks pass, tests use pytest.importorskip so zero impact on users without tealtiger installed). If there's anything specific on the testing side you'd like me to address or restructure before then, happy to do it proactively so it's ready to merge right after 1.0 lands. Just let me know. |
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Why are these changes needed?
AG2 Beta's middleware system currently has logging, retries, history trimming, and token limiting — but no governance middleware for policy enforcement, tool access control, or structured audit evidence.
This Extension adds TealTiger as a governance middleware that enforces tool allowlists, detects PII in tool arguments, tracks per-agent cost, provides per-agent kill switches, and produces structured TEEC receipts — all deterministically in <5ms with no LLM in the governance path.
Follows the Extension contribution policy: named maintainer, Google-style docstrings, tests,
missing_additional_dependencyguard for thetealtigerthird-party package.Related issue number
Closes #2967
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Extension details
Named maintainer: @nagasatish007
Additional dependency:
tealtiger>=1.3.0Location:
autogen/beta/extensions/tealtiger/Tests:
test/beta/extensions/tealtiger/test_governance_invariants.py(13 tests)Capabilities
on_tool_execution()on_tool_execution()on_tool_execution()on_tool_execution()on_turn()+on_tool_execution()Usage
Governance invariants tested