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Tool rules: forward metadata through wrappers, close review gaps, pin tinytools#57 - #357
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Update the vendored tinytools submodule to the latest commit. Auto-committed-on: dragonfly Co-authored-by: Medulla <medulla@tinyhumans.ai>
…pers The shared-tool adapter and the override tool now delegate family, tags and indirect target to the wrapped tool instead of falling back to defaults, so tool rules no longer miss tags or lose a dispatcher's real target when a tool is renamed or prefixed. The vendored tinytools submodule is bumped to the matching revision. Auto-committed-on: dragonfly Co-authored-by: Medulla <medulla@tinyhumans.ai>
The shared tool tests now live in their own module file instead of being inlined alongside the implementation. This keeps the test code separate from production code without changing any behaviour. Auto-committed-on: dragonfly Co-authored-by: Medulla <medulla@tinyhumans.ai>
Add a test asserting that renaming a tool through OverrideTool preserves the family, tags, and indirect target that the host's tool rules rely on, so a renamed or prefixed tool is still treated as the same tool. Auto-committed-on: dragonfly Co-authored-by: Medulla <medulla@tinyhumans.ai>
Co-authored-by: Medulla <medulla@tinyhumans.ai>
Update the vendored tinytools submodule to the latest upstream commit. Auto-committed-on: dragonfly Co-authored-by: Medulla <medulla@tinyhumans.ai>
Co-authored-by: Medulla <medulla@tinyhumans.ai>
Co-authored-by: Medulla <medulla@tinyhumans.ai>
Co-authored-by: Medulla <medulla@tinyhumans.ai>
Co-authored-by: Medulla <medulla@tinyhumans.ai>
Split the tool call execution path into smaller helpers so the agent loop is easier to follow and each step can be tested in isolation. Behaviour is unchanged. Auto-committed-on: dragonfly Co-authored-by: Medulla <medulla@tinyhumans.ai>
The intrinsic tool_search bridge now consults the tool rules on both the catalog and call surfaces, so a host can withhold discovery itself rather than only the tools it would reveal. Registered names are also reserved against toolset tools even when the rules keep them off the catalogue. Auto-committed-on: dragonfly Co-authored-by: Medulla <medulla@tinyhumans.ai>
Refused tool search calls no longer roll back their budget slot, matching the other answered recoveries that consume a slot. The comment was updated to explain why the call keeps its budget. Auto-committed-on: dragonfly Co-authored-by: Medulla <medulla@tinyhumans.ai>
Auto-committed-on: dragonfly Co-authored-by: Medulla <medulla@tinyhumans.ai>
Auto-committed-on: dragonfly Co-authored-by: Medulla <medulla@tinyhumans.ai>
Re-check rules on repaired arguments, keep a rewrite target's approval directive, gate the intrinsic tool_search bridge, reserve every registered name against toolset collisions, and cover nested-call rules. Co-authored-by: Medulla <medulla@tinyhumans.ai>
Tiny Sweeper reviewTiny Sweeper reviewed this change across 6 lane(s). The critique and security lanes report outstanding 'missing-behavior-test'/'missing-tests' findings asking for focused tests around intrinsic admission decisions in crates/tinyagents-harness/src/agent_loop/tools.rs, crates/tinyagents-harness/src/agent_loop/tool_surface.rs, and crates/tinyagents-harness/src/tool/rules/types.rs; the tests lane reports the three earlier findings resolved by named tests in this diff and no new blocking findings. The description lane finds the PR body matches the diff (noting the body's test list omits three added tests and a `use super::*` change). The commits lane found nothing sensitive; e2e reports no end-to-end harness exists in the repository. Code retrieval and memory were unavailable, so the review saw the diff alone. State: Ready for maintainer review Review snapshot
Completeness: Complete What changedThis pull request extends the tool-rules system in tinyagents-harness. The `ToolGate` gains an `admits_intrinsic` decision path for harness-intrinsic tools such as the `tool_search` bridge, evaluated per surface (catalog vs call) and independent of the registration allowlist (crates/tinyagents-harness/src/tool/rules/types.rs#impl ToolGate). The agent loop now consults intrinsic admission when building the deferred catalog and refuses a `require_approval` rule on `tool_search` because the bridge is answered in place and cannot be deferred to an approver, returning an answered error instead of revealing withheld tools (crates/tinyagents-harness/src/agent_loop/tools.rs#impl<State: Send + Sync, Ctx: Send + Sync> AgentHarness<State, Ctx>). Rule admission is factored into a `rule_admission` helper, re-checked a second time on the final post-repair/normalization arguments before approval and dispatch (combining directives with `strictest`), and an unknown-tool rewrite target now carries its own approval directive rather than the unknown name's; the unknown-tool recovery message also avoids pointing at a denied or unanswerable `tool_search` bridge (crates/tinyagents-harness/src/agent_loop/tools.rs#impl<State: Send + Sync, Ctx: Send + Sync> AgentHarness<State, Ctx>). The tool surface keeps a registered tool's name reserved even when rules keep it off the catalogue (using the full registry name list), and lists the `tool_search` bridge only when it is answerable on both catalog and call surfaces (crates/tinyagents-harness/src/agent_loop/tool_surface.rs#impl<State: Send + Sync, Ctx: Send + Sync> AgentHarness<State, Ctx>). Wrapper adapters now forward behavior-bearing metadata to tool rules: `CanonicalSharedToolAdapter` forwards `tags` and `indirect_target` (crates/tinyagents-harness/src/tool/shared/mod.rs#impl Tool for CanonicalSharedToolAdapter) and the toolset `OverrideTool` forwards `family`, `tags`, and `indirect_target` so renamed/prefixed tools remain the same tool to the rules (crates/tinyagents-harness/src/tool/toolset/mod.rs#impl Tool for OverrideTool). `indirect_target` implementations now return `tinytools::IndirectCall` (crates/tinyagents-harness/src/agent_loop/tool_rules_tests.rs#impl Tool for RuleTool). New nested-call tests verify that tool rules bind nested calls: a deny rule refuses them, a require_approval rule fails them rather than deferring, and an auto_approve rule waives a declared approval (crates/tinyagents-harness/src/agent_loop/nested_tests.rs#async fn a_parent_dropped_while_a_nested_result_is_observed_still_closes_the_cal). FeaturesNone identified with supported citations. Tests
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Before mergeNone. How this fits togetherflowchart LR
n0["CanonicalSharedToolAdapter<br/>changed"]:::changed
n1["for_name"]:::impacted
n2["EarlyExitHook"]:::impacted
n3["...fires_after_a_successful_canonical_result"]:::impacted
n0 -->|uses| n2
n3 -->|calls| n1
n3 -->|tests| n1
classDef changed fill:#0d4429,stroke:#238636,color:#e6edf3
classDef impacted fill:#161b22,stroke:#6e7681,color:#c9d1d9
classDef flagged fill:#5a1e02,stroke:#d93f0b,color:#ffffff
classDef blocking fill:#67060c,stroke:#f85149,color:#ffffff
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Included review availability: This review used your included allowance. Your plan provides up to 2 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe harness centralizes rule admission for registered tools and applies rules to intrinsic discovery, prepared arguments, and rewrite targets. Tool-surface construction filters discovery bridges and registered-name collisions. Shared and renamed tool adapters forward family, tag, and indirect-call metadata. Tests cover nested-call enforcement and these paths. ChangesTool Rule Admission
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant AgentHarness
participant ToolGate
participant Model
participant DeferredCatalog
AgentHarness->>ToolGate: Check tool_search admission on Catalog surface
ToolGate-->>AgentHarness: Return admission decision
AgentHarness->>Model: Advertise bridge when admitted and catalog is nonempty
Model->>AgentHarness: Send tool_search call
AgentHarness->>ToolGate: Check intrinsic call admission
ToolGate-->>AgentHarness: Return admission decision
AgentHarness->>DeferredCatalog: Query catalog when admitted
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| Check name | Status | Explanation | Resolution |
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Docstring coverage is 49.15% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 59 functions across 10 files. | Write docstrings for the functions missing them to satisfy the coverage threshold. |
✅ Passed checks (4 passed)
| Check name | Status | Explanation |
|---|---|---|
| Description Check |  |
Check skipped - CodeRabbit’s high-level summary is enabled. |
| Title check | |
The title accurately summarizes the main changes: forwarding tool metadata through wrappers, addressing review gaps, and pinning the tinytools dependency. |
| Linked Issues check | |
Check skipped because no linked issues were found for this pull request. |
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A rabbit checks each call with care,
It follows tags through tools’ domain.
A hidden search must pass the gate,
Repaired arguments meet the rule.
Nested calls are checked before they run,
Then hops the rabbit down the lane.
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Review comments at @crates/tinyagents-harness/src/agent_loop/tools.rs:
- Around line 377-378: Handle the approval directive returned by
`gate.admits_intrinsic(TOOL_SEARCH_NAME, tinytools::Surface::Call)` before
calling `answer_tool_search`: when it returns `CallGate::Admit(Required)`, defer
the intrinsic call or refuse it if approval is unsupported, rather than
returning search results without approval.
- Around line 707-708: After normalize_tool_arguments updates the call
arguments, re-run rule_admission with the normalized arguments before execution.
Combine admitted approvals into rule_approval using strictest, and return the
existing refusal result if admission refuses the call.
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crates/tinyagents-harness/src/agent_loop/nested_tests.rscrates/tinyagents-harness/src/agent_loop/tool_rules_tests.rscrates/tinyagents-harness/src/agent_loop/tool_surface.rscrates/tinyagents-harness/src/agent_loop/tools.rscrates/tinyagents-harness/src/tool/rules/types.rscrates/tinyagents-harness/src/tool/shared/mod.rscrates/tinyagents-harness/src/tool/shared/mod_tests.rscrates/tinyagents-harness/src/tool/toolset/mod.rscrates/tinyagents-harness/src/tool/toolset/mod_tests.rsvendor/tinytools
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Rule admission now runs again after repair and normalization, so a JSON-encoded payload that decodes into a denied target is refused before dispatch. A require_approval rule on tool_search also refuses discovery since the bridge cannot be deferred, and unknown-tool recovery no longer suggests a tool_search that the rules withhold. Auto-committed-on: dragonfly Co-authored-by: Medulla <medulla@tinyhumans.ai>
Replace the harness_with helper with direct AgentHarness construction in the normalized-arguments test so the policy is set up inline. This keeps the test self-contained and avoids relying on the shared helper. Auto-committed-on: dragonfly Co-authored-by: Medulla <medulla@tinyhumans.ai>
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The bridge is now advertised only when a call to it would actually be answered, so an approval-gated bridge no longer appears in the tool surface since it cannot be deferred to an approver. A test asserts the bridge stays unadvertised under a require_approval rule. Auto-committed-on: dragonfly Co-authored-by: Medulla <medulla@tinyhumans.ai>
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tinysweeper found nothing blocking. Approving.
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| tinytools::ToolResult::error(message), | ||
| ))); | ||
| } | ||
| let mut rule_approval = match self.rule_admission(&gate, &call.name, &model_arguments) { |
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Add focused tests for intrinsic admission decisions
This change adds several admission branches—registered calls, unknown names, rewrite targets, repaired arguments, and the intrinsic tool_search bridge—but the diff adds no focused tests for those decisions. In particular, a test should cover a rule that refuses or requires approval for discovery and a rule whose argument predicate changes after repair, so regressions in the new gate ordering and budget rollback behavior are caught before merge.
[RULE] missing-focused-tests ·
| } | ||
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| #[test] | ||
| fn an_intrinsic_is_admitted_without_rules_and_ignores_the_allowlist() { |
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Add focused tests for intrinsic admission decisions
This adds coverage for intrinsic admission with an allowlist and for several rule outcomes, so the previously reported test-coverage concern is fixed by this revision.
[RULE] missing-behavior-test ·
| } | ||
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| #[test] | ||
| fn an_intrinsic_is_admitted_without_rules_and_ignores_the_allowlist() { |
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Roll back the reserved slot when repaired arguments are refused
These tests only inspect ToolGate::admits_intrinsic and do not cover the execution path where repaired arguments are refused after a slot has been reserved. The previously reported rollback concern is still not addressed by this change.
[RULE] slot-rollback ·
| CallGate::Refuse(message) => assert!(message.contains("rule 'quiet'"), "{message}"), | ||
| other => panic!("hidden from the catalogue, got {other:?}"), | ||
| } | ||
| assert_eq!( |
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Roll back the reserved slot after repaired-call refusal
The added intrinsic-admission assertions do not test the repaired-call refusal path or release its reserved slot. The previously reported duplicate rollback concern remains unresolved in the current revision.
[RULE] slot-rollback ·
| fn an_intrinsic_is_admitted_without_rules_and_ignores_the_allowlist() { | ||
| let allowed: HashSet<String> = ["registered".to_string()].into(); | ||
| let gate = ToolGate::new(Some(allowed), &ToolRulePolicy::default(), None); | ||
| assert_eq!( |
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Honor approval directives for intrinsic discovery
The new test locks in that an intrinsic is admitted with ApprovalDirective::Default when no rules apply, but it does not exercise or verify approval directives supplied by intrinsic discovery. The previously reported concern about approval directives therefore remains unresolved; ensure intrinsic admission preserves the directive required by the discovery path rather than always defaulting it.
[RULE] approval-directive ·
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| let run = run(&harness, "normalized").await; | ||
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| assert_eq!(execute.calls(), 0); |
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Roll back the reserved slot after repaired-call refusal
The normalized-arguments test confirms that the final rule check refuses the call, but the refusal still needs to release the tool-call budget reservation. Without that rollback, a policy-rejected repaired call consumes a slot and may prevent later legitimate calls from running. Restore the reservation on this path and test that the next call remains within the configured budget.
Additional critique observation
Roll back the reserved slot after repaired-call refusal
[RULE] rollback-reserved-slot
The normalized-argument test confirms that the final rule check blocks execution, but it still does not cover the reserved tool-call slot. A refusal after normalization must release that reservation so a subsequent model response can run under a tight tool-call limit; otherwise valid follow-up calls are incorrectly rejected. Add coverage for the one-slot case and fix the refusal path if it leaves the slot consumed.
[RULE] resource-reservation ·
| ) | ||
| ) | ||
| }; | ||
| let bridge_listed = |
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Add focused tests for intrinsic admission decisions
This change introduces distinct behavior for hidden, denied, default-approved, and waived intrinsic discovery admission, but the diff adds no focused tests covering those decisions. Add tests that assert the bridge is omitted for denied or approval-gated catalog/call admission and included for default or waived admission.
Additional critique observation
Add focused tests for intrinsic admission decisions
[RULE] missing-tests
This changes whether the intrinsic tool_search schema is advertised based on separate catalogue and call admission decisions, including hidden, refused, and approval-required directives. The diff adds no focused tests for these combinations, so regressions could advertise an unusable bridge or omit a callable one. Add tests covering default/waived admission, refusal on either surface, and approval-required discovery.
[RULE] missing-tests ·
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| #[tokio::test] | ||
| async fn repaired_arguments_are_checked_against_the_rules_again() { |
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Roll back the reserved slot when repaired arguments are refused
This test verifies that a repaired call is denied and not executed, but it does not address the reserved tool-call slot. When the repaired arguments are refused by the rules, the reservation must be returned before the loop continues; otherwise a rejected repair consumes max_tool_calls capacity and can prematurely terminate the run. Roll back the reservation on this refusal path and add a regression assertion covering a subsequent tool call.
[RULE] budget-slot-rollback ·
| } | ||
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| #[tokio::test] | ||
| async fn normalized_arguments_are_checked_against_the_rules_again() { |
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Roll back the reserved slot after repaired-call refusal
The normalized-arguments test confirms that the final rule check refuses the call, but the refusal still needs to release the tool-call budget reservation. Without that rollback, a policy-rejected repaired call consumes a slot and may prevent later legitimate calls from running. Restore the reservation on this path and test that the next call remains within the configured budget.
[RULE] budget-slot-rollback ·
| // `run_loop_body` — an empty declared list never falls back to | ||
| // "unrestricted" here either. | ||
| let gate = self.resolve_tool_gate(ctx)?; | ||
| let intrinsic = match gate.admits_intrinsic(TOOL_SEARCH_NAME, tinytools::Surface::Call) { |
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Add focused tests for intrinsic admission decisions
The new intrinsic discovery admission path now changes security-sensitive behavior: a rule can refuse discovery, while a required approval is converted into an immediate refusal because discovery cannot be deferred. This branch has no focused test in the diff covering those admission outcomes, leaving regressions in the rule gate or approval mapping easy to introduce unnoticed. Add tests that exercise allowed, refused, and approval-required intrinsic discovery, including the resulting tool response and budget behavior.
[RULE] missing-behavior-tests ·
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| // indirect target or an argument condition reads, so the final | ||
| // decision is made here, before approval and dispatch. | ||
| match self.rule_admission(&gate, &call.name, &call.arguments) { | ||
| CallGate::Admit(approval) => rule_approval = rule_approval.strictest(approval), |
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When a malformed provider call is successfully repaired and the repaired arguments make an indirect-target or argument-based require_approval rule match, this second pass sets Required. With with_deferred_tool_handler, a plain approval immediately reruns DeferredRequest.call, but that call is reconstructed below from the raw model_arguments using ToolCall::new, which loses the original invalid marker. The approved call therefore skips repair and fails schema validation instead of executing; preserve the parse-error state or retain a separate repaired executable call for this inline-approval path.
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tinysweeper found nothing blocking. Approving.
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| // (a JSON-encoded object decoded) or preparation can change what an | ||
| // indirect target or an argument condition reads, so the final | ||
| // decision is made here, before approval and dispatch. | ||
| match self.rule_admission(&gate, &call.name, &call.arguments) { |
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Add focused tests for intrinsic admission decisions
This pull request changes several admission decisions—intrinsic discovery can now be refused or affected by approval directives, rewritten calls use the rewrite target's approval, and repaired arguments are checked again before dispatch—but it adds no focused tests. These paths are particularly sensitive to ordering and budget rollback, so add tests covering intrinsic default/required/refused decisions and refusal after argument repair before merging.
Additional security observation
Add focused tests for intrinsic admission decisions
[RULE] missing-behavior-tests
This changes admission behavior for intrinsic discovery, rewritten unknown-tool calls, and post-repair arguments, but the diff adds no focused tests. Without coverage, regressions could allow discovery despite a refusal, lose a stricter approval directive, or dispatch repaired arguments that should be refused. Add tests covering intrinsic refusal/approval, rewrite-target directives, and final admission after argument repair.
[RULE] missing-behavior-test ·
| ) | ||
| ) | ||
| }; | ||
| let bridge_listed = |
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Add focused tests for intrinsic admission decisions
This changes which tool_search schema is advertised for combinations of catalog and call decisions, including denied and approval-required intrinsic rules, but the diff adds no focused tests covering those combinations. Add tests that assert the bridge is omitted when either surface is denied or approval-gated and included only when both surfaces are answerable.
[RULE] missing-tests ·
| /// Intrinsics are not registrations, so a definition's exact allowlist | ||
| /// (which names registered tools) does not apply; the rules do, so a | ||
| /// host can withhold discovery itself. | ||
| pub(crate) fn admits_intrinsic(&self, name: &str, surface: Surface) -> CallGate { |
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Add focused tests for intrinsic admission decisions
This adds a new admission path that can either refuse an intrinsic or return an approval directive, but the diff does not add focused tests for either outcome. Add tests covering permissive admission, rule-based refusal, and propagation of non-default approval directives so changes to intrinsic discovery cannot silently bypass policy.
[RULE] missing-focused-tests ·
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Summary
Follow-up to #353, which merged at
4eb24b3before these review-driven fixes landed. All of them complete the tool-rules gate:vendor/tinytoolsto the Add declarative tool rules (allow/deny/hide/approval) tinytools#57 merge commit (bd60b9b). Evaluate tool rules on catalogue, search and every call #353 pinned the unmerged branch head.CanonicalSharedToolAdapter(which hosts register tools through) and the rename/prefixOverrideToolnow forwardfamily,tagsandindirect_target. Without this, tag rules missed and a dispatcher's real target escaped.IndirectCall. An indirect target is checked against its own arguments, not the dispatcher's envelope.UnknownToolPolicy::Rewritecarries the rewrite target'sApprovalDirective:require_approvaldefers andauto_approvewaives.tool_searchitself. A rule denyingtool_searchkeeps the bridge off the catalogue and refuses a call to it. The definition allowlist does not apply, since it names registered tools and the bridge is intrinsic.require_approvalandauto_approve.tool_rules_tests.rsnow starts withuse super::*.API Or Behavior Changes
Tool::indirect_targetnow returnsOption<tinytools::IndirectCall>(from tinytools#57).Tests
cargo fmt --checkcargo clippy --workspace --all-targets --all-features -- -D warningscargo test --workspace --all-features: every suite passes.New tests:
agent_loop/tool_rules_tests.rs:a_rewrite_target_carries_its_own_approval_rulerepaired_arguments_are_checked_against_the_rules_againa_rule_can_withhold_tool_search_itselfa_toolset_tool_never_takes_a_denied_registered_tools_nameagent_loop/nested_tests.rs: three tool-rule casestool/shared/mod_tests.rs:canonical_adapter_forwards_tool_rule_metadatatool/toolset/mod_tests.rs:an_override_keeps_what_tool_rules_readSummary by CodeRabbit