tool: add opt-in no-progress guard - #2549
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Included review availability: Your plan provides up to 4 included reviews per hour; 1 remains after this review. 📝 SummaryEnglishOverviewAdds an opt-in The guard uses SHA-256 fingerprints over JSON-encoded values. Equivalent JSON objects produce the same fingerprint. It triggers at the configured threshold and resets when the action/observation pair changes or JSON marshaling fails. The guard is safe for concurrent use through an internal mutex. Callers must not copy it after first use. Thresholds below two, including the zero value, use an effective threshold of two. Existing behavior remains unchanged unless callers explicitly use the guard. Public API and compatibilityAdded:
API review points:
Risks
ValidationValidated with formatting checks, Tests cover zero-value thresholds, consecutive repeats, equivalent JSON arguments, reset behavior, marshal failures, and concurrent use. Run 中文概要在 该工具对 JSON 编码后的值计算 SHA-256 指纹。等价 JSON 对象会产生相同指纹。达到配置阈值后触发。操作或观察结果变化、JSON 序列化失败时重置状态。 该工具通过内部互斥锁支持并发使用。首次使用后不得复制。小于 2 的阈值（包括零值）实际按 2 处理。除非调用方显式使用该工具，否则现有行为不变。 公共 API 与兼容性新增：
API 审查重点：
风险
验证建议已通过格式检查、 测试覆盖零值阈值、连续重复、等价 JSON 参数、重置、序列化失败和并发使用。当环境提供 C 编译器后，运行 WalkthroughAdds ChangesNo-progress detection
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to This adds an opt-in no-progress guard without changing existing behavior or introducing production, security, or deployment impact; no actionable merge-blocking risk remains after normal checks and review. 🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@tool/no_progress_guard.go`:
- Around line 33-39: Update NoProgressGuard.Observe to enforce the minimum
threshold when the guard is created as a zero value, so its first observation
does not return true solely because threshold is zero. Preserve normal
constructor-configured behavior and add a regression test covering
NoProgressGuard{}.
- Line 1: Add the required Tencent Apache 2.0 license header from
CONTRIBUTING.md before package tool in tool/no_progress_guard.go at lines 1-1
and tool/no_progress_guard_test.go at lines 1-1; both sites require the same
direct header addition.
- Around line 51-52: Handle errors from both json.Marshal calls in the
no-progress guard before fingerprinting; when either serialization fails, reset
the guard state and return false rather than using empty bytes. Add regression
coverage using distinct non-serializable values such as NaN and positive
infinity to verify they are not treated as repeated input.
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| // NoProgressGuard detects consecutive tool calls with the same ordered action | ||
| // and observation. It is disabled unless a caller explicitly uses it. | ||
| type NoProgressGuard struct { | ||
| threshold int |
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The zero value is active, so a zero-valued NoProgressGuard can fire on the first call. Please make the default state inert or document constructor-only use.
中文
零值是激活的，所以零值的 `NoProgressGuard` 会在第一次调用时触发。请让默认状态保持无效，或明确只支持构造函数使用。There was a problem hiding this comment.
Addressed in the current head a460b2b33386f9d6e12cfb013aa68ab5a82442dc: thresholds below two, including a zero-valued guard, are normalized to an effective threshold of two. The zero-value regression test verifies that the first observation does not trigger and the second identical observation does.
| } | ||
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| func noProgressFingerprint(name string, arguments, observation any) string { | ||
| argumentsJSON, _ := json.Marshal(arguments) |
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Discarding json.Marshal errors collapses unsupported arguments and observations to the same fingerprint. Please preserve marshal failures in the hash input or use a non-lossy fallback.
中文
忽略 `json.Marshal` 错误会把不支持的参数和观测压成相同指纹。请把编组失败也纳入哈希输入，或使用不会丢信息的回退方案。There was a problem hiding this comment.
Addressed in commit 4d1c3a670749d683ca03e84dfdedbd51043eef7. The chosen non-lossy fallback for json.Marshal errors is to clear the repeat state and return false, so failed serializations never become a shared fingerprint. Regression coverage exercises failed NaN and positive-infinity serializations and verifies that the next valid observation starts a fresh sequence.
Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #2549 +/- ##
===================================================
+ Coverage 90.13101% 90.14372% +0.01270%
===================================================
Files 1254 1254
Lines 229760 229894 +134
===================================================
+ Hits 207085 207235 +150
+ Misses 14201 14186 -15
+ Partials 8474 8473 -1
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Inline comments:
In `@tool/no_progress_guard_test.go`:
- Around line 58-69: Update TestNoProgressGuardMarshalFailureResetsState to
first record two identical valid observations, then perform a marshal-failing
observation value that reaches noProgressFingerprint’s observation-serialization
branch, and finally repeat the valid observation. Assert the failure does not
trigger and the final identical observation does not trigger, proving the
existing repeat state was reset.
In `@tool/no_progress_guard.go`:
- Around line 40-55: Define the concurrency contract for NoProgressGuard by
synchronizing shared state access in Observe and Reset, or explicitly
documenting single-goroutine ownership in its exported API; ensure concurrent
use cannot race or corrupt repeat counts.
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Inline comments:
In `@tool/no_progress_guard.go`:
- Around line 18-24: Update the Godoc for NoProgressGuard to state that it must
not be copied after first use, preserving the current API and mutex-based
behavior.
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Addressed the remaining review feedback in f73c174: synchronized NoProgressGuard state with a mutex, documented the no-copy/concurrent-use contract, and strengthened marshal-failure and concurrent-use regression coverage. Local checks: go test ./tool, go vet ./tool, and git diff --check pass. go test -race could not run because the environment has no C compiler (gcc). |
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Inline comments:
In `@tool/no_progress_guard_test.go`:
- Around line 78-91: Update TestNoProgressGuardSupportsConcurrentUse to collect
the boolean results from NoProgressGuard.Observe instead of only waiting on the
goroutines, and assert the expected concurrent contract for
NewNoProgressGuard(2): across 800 identical Observe("lookup", nil, nil) calls,
exactly 799 should return true. Keep the existing concurrent setup with
sync.WaitGroup and use the guard’s Observe method as the observable behavior
being verified.
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Detailed review report / 详细评审报告
Reviewed head: 379f9c7e0962b2b610e853314700aaacf7881f42
English
Overall assessment
Thank you for working on the no-progress problem and for iterating on the earlier feedback. The implementation is small, opt-in, nil-safe, zero-value-safe, and data-race-safe. Its unit tests cover the basic consecutive-count behavior, reset behavior, marshal failure, and concurrent access.
However, I do not recommend merging the PR in its current form. The code is correct only as a narrow counter for consecutive, JSON-marshallable (tool name, arguments, observation) tuples. It does not correctly model the agent-level, multi-tool no-progress loop described in #2346. In addition, plugin/toolloopwarning was subsequently merged into main by #2490 and now owns substantially the same framework responsibility with more complete semantics.
I am not asking that this PR be closed immediately. Please keep it open while the contributor and maintainers decide whether it should be rebased and redesigned as an extension of the existing plugin, or eventually marked as superseded after the remaining hard-intervention policy is addressed.
1. Blocking: compare complete tool rounds, not callback completion adjacency
NoProgressGuard.Observe stores one previous fingerprint and compares observations in the order in which callers invoke the method. That is not the same as the ordered tool round emitted by the model.
The motivating case in #2346 repeats a two-tool bundle. If an application calls Observe once per completed tool, two identical rounds produce this stream:
round 1: search, read
round 2: search, read
observed stream: search, read, search, read
No adjacent single-call fingerprints match, so the guard never triggers, regardless of how many times the complete round repeats.
Parallel completion can also create a false positive:
model order in both rounds: search, read
round 1 completion order: search, read
round 2 completion order: read, search
observed stream: search, read, read, search
^ false trigger
The mutex prevents memory races, but it does not establish the required semantic ordering or a result barrier. Sharing one guard across independent invocations has a similar problem: the first matching call in invocation B may be counted as a repeat of invocation A even though neither invocation has repeated.
The detector needs invocation-local state and should:
- collect the complete tool-call bundle;
- wait until all results for that round are finalized;
- correlate results by tool-call ID;
- restore the model's original tool-call order; and
- fingerprint and compare the complete round.
The detector now in plugin/toolloopwarning/detector.go already implements these round-level mechanics. Reusing or extending it would avoid establishing a second, incompatible definition of “no progress.”
2. Blocking: real callback JSON arguments are not canonicalized
noProgressFingerprint calls json.Marshal(arguments). The production tool callback APIs expose arguments as []byte (BeforeToolArgs.Arguments, AfterToolArgs.Arguments, and ToolResultMessagesInput.Arguments). encoding/json marshals a []byte as a Base64 JSON string; it does not parse and canonicalize the JSON contained in those bytes.
Consequently, these semantically equivalent callback arguments produce different fingerprints:
{"a":1,"b":2}
{ "b": 2, "a": 1 }I reproduced this using []byte arguments against the PR head. The second Observe returned false. The existing TestNoProgressGuardCanonicalizesJSONArguments uses map[string]any, so it does not exercise the actual framework argument type.
If this code is retained, raw JSON arguments should have a dedicated canonicalization path: decode with json.Decoder.UseNumber, require exactly one JSON value, then re-marshal it. The invalid-JSON fallback must also have an explicit contract. The implementation in plugin/toolloopwarning.canonicalArguments is an existing reference and preserves large integer values.
3. Blocking design issue: reconcile this public API with plugin/toolloopwarning
PR #2490 was merged after this branch was last updated. Current main now has an opt-in plugin/toolloopwarning implementation that already provides:
- complete ordered tool-round comparison;
- tool-call-ID/result correlation independent of completion order;
- canonical raw JSON arguments;
- final model-visible tool result comparison;
- request/invocation-local state;
- exclusions for expected polling/background tools;
- a request-local warning that does not change the default behavior; and
- focused documentation and integration examples.
This PR would add four long-lived public symbols to the root tool package without any production integration or example. Nothing outside its unit tests currently calls NoProgressGuard. The distinction between the two public entry points is not documented, and the generic name NoProgressGuard is broader than its actual exact, per-observation JSON tuple semantics.
There is also no framework point at which the new API guarantees that observation is the finalized content visible to the model. Calling it from AfterTool sees the raw result before result formatting and ToolResultMessages replacement. Two different raw values may become the same model-visible message, or the same raw value may be transformed differently. A no-progress decision must use the final transcript seen by the model.
Please rebase onto current main and explicitly choose one coherent ownership model. My preference is to keep the round detector inside plugin/toolloopwarning and extend that plugin only when the remaining policy is agreed.
4. The current API does not yet provide a hard guard
The name may suggest that tool execution is bounded, but Observe only returns a boolean after an observation already exists. It does not register callbacks, inject a diagnostic, emit an event, return StopError, cancel sibling calls, or short-circuit the next repeated action before side effects occur.
For an opt-in hard-protection V2, a conservative direction would be:
- preserve the current default and current warn-only behavior;
- after an exact repeated finalized round, inject a warning and arm invocation-local state;
- if the model immediately emits the same ordered action bundle again, block before executing that next bundle or terminate through a deliberately selected policy;
- define parallel sibling-call behavior and cancellation explicitly;
- keep per-tool exclusions and leave room for a progress comparator;
- expose safe diagnostics such as repeat count, tool names, and a digest, without tool-result contents; and
- retain the existing hard call/iteration limits as the final safety net.
The exact exported option names should follow a maintainer-approved design rather than adding another generic helper prematurely.
5. Important: lifecycle, concurrency, and cost contracts remain incomplete
If the helper remains public, its Godoc should define at least:
- that one guard represents exactly one logical, sequential observation stream;
- whether it must be created per invocation and must not be shared across sessions;
- whether
thresholdcounts total identical occurrences or repeats after the first occurrence; - that all identical observations at and above the threshold continue returning
true; - JSON equivalence rules for typed values,
[]byte, andjson.RawMessage; - reset behavior after either argument or observation marshal failure; and
- the expected behavior for large observations and custom
json.Marshalerimplementations.
Currently JSON serialization and hashing of arbitrary caller-provided values occur while the mutex is held. Large or slow observations therefore serialize all users of the guard and may allocate the entire model-visible result. The existing plugin bounds large text and binary payloads before creating the final round fingerprint.
6. Scope: please split the CI change into a separate PR
The .github/scripts/check-go-mod-version.sh change modifies independent repository-wide validation behavior by skipping the download probe for matching local directory replacements. It is not present on current main, and it is not part of the no-progress guard design.
If this fixes a real problem on main, the contribution is welcome. Please split it into a focused PR, link it to its own issue or rationale, add targeted script coverage where practical, and use a title describing the CI result. This will let maintainers review and merge the CI fix independently without coupling it to a public framework API decision. If it was only intended to synchronize another main-branch change, please remove it while rebasing.
The current title should also be updated to the repository format (tool: ..., not feat(tool): ...), and the final PR should carry the appropriate type/feature and type/api-change labels if it continues to add public API.
What is already good
- Existing behavior remains unchanged unless a caller opts in.
- Nil receivers fail open.
- The zero value has a useful minimum threshold.
- Marshal failures do not collapse unrelated unsupported values into one fingerprint.
Resetclears repeat state.- The mutex eliminates data races in the internal fields.
- The implementation is small and easy to understand for its narrow tuple-counter contract.
Additional tests needed for a revised design
- repeated ordered two-tool rounds;
- parallel results completing in different orders;
- isolation between concurrent invocations;
- raw
[]byteJSON with whitespace/key-order differences and large integers; - changed action with the same result and the same action with a changed result;
- comparison after result formatter and
ToolResultMessagestransformation; - explicitly excluded polling tools;
- warning-then-repeat intervention behavior;
- threshold values greater than two;
- marshal failure in the observation branch; and
- bounded behavior for large/multimodal results.
Validation performed
GOWORK=off go test -count=1 ./tool— passed on the PR head.GOWORK=off go test -race -count=1 ./tool— passed on the PR head.- A temporary merge with current
origin/main, followed by tests for./tooland./plugin/toolloopwarningin normal and race modes — passed. bash -n .github/scripts/check-go-mod-version.sh— passed.git diff --check origin/main...origin/pr/2549— passed.- A temporary regression test using semantically equivalent raw
[]byteJSON arguments — failed as described above; the temporary test was not committed.
Recommended disposition
Please keep the PR open for now, rebase it onto current main, and discuss whether the remaining goal is a hard-intervention extension to plugin/toolloopwarning. If so, redesign this work around that existing round-level implementation while preserving warn-only defaults. Please move the CI fix into a separate PR. I would be happy to review the revised, focused contributions.
中文
总体结论
感谢贡献者持续处理 no-progress 问题，并认真修复此前关于零值、序列化失败、许可证和数据竞争的反馈。当前实现规模很小，默认不开启，对 nil 和零值友好，并通过互斥锁消除了内部字段的数据竞争；已有单测也覆盖了基本连续计数、重置、序列化失败和并发访问。
不过，我不建议按当前形态合并。它严格来说只是一个针对连续、可 JSON 序列化 (工具名, 参数, observation) 三元组的计数器，不能正确表达 #2346 中 Agent 层面的多工具 no-progress 循环。同时，主干后来已通过 #2490 合入 plugin/toolloopwarning，后者在框架层承担了高度重叠的职责，而且语义更完整。
这里不建议立刻关闭该 PR。可以先保持打开，由贡献者和维护者讨论：是基于主干已有插件重新设计为硬干预扩展，还是等剩余策略落地后再将该 PR 标记为被取代。
1. 阻塞问题：应比较完整工具轮次，而不是回调完成顺序中的相邻单项
NoProgressGuard.Observe 只保存一个上次指纹，并按照调用方执行 Observe 的顺序比较。这不等同于模型输出的有序工具轮次。
#2346 的真实案例是两个工具组成的 bundle 不断重复。如果每个工具完成后调用一次 Observe：
第 1 轮：search, read
第 2 轮：search, read
Observe 序列：search, read, search, read
相邻的单工具指纹始终不同，所以即使完整轮次重复 115 次也不会触发。
并行完成顺序变化时还会误报：
两轮模型顺序都是：search, read
第 1 轮完成顺序：search, read
第 2 轮完成顺序：read, search
Observe 序列： search, read, read, search
↑ 在这里错误触发
mutex 只能防止内存数据竞争，无法建立所需的模型顺序和结果 barrier。如果多个 invocation 共用一个 guard，也会发生相同问题：B 请求的第一次调用可能被算成 A 请求的重复，尽管两个请求内部都没有重复。
正确的 detector 应当使用 invocation-local 状态，并完成以下步骤：
- 收集完整工具调用 bundle；
- 等待该轮所有结果最终完成；
- 用 ToolCallID 关联调用和结果；
- 恢复模型原始工具调用顺序；
- 对完整轮次计算指纹并比较。
主干的 plugin/toolloopwarning/detector.go 已经实现了这些轮次级机制。复用或扩展它，可以避免仓库中出现两种互不兼容的“无进展”定义。
2. 阻塞问题：真实回调中的 JSON 参数并未被规范化
noProgressFingerprint 直接执行 json.Marshal(arguments)。但生产工具回调中的参数类型是 []byte，包括 BeforeToolArgs.Arguments、AfterToolArgs.Arguments 和 ToolResultMessagesInput.Arguments。encoding/json 会把 []byte 编码成 Base64 JSON 字符串，而不会解析其中承载的 JSON。
因此下面两个语义相同的回调参数会得到不同指纹：
{"a":1,"b":2}
{ "b": 2, "a": 1 }我在 PR head 上使用真实 []byte 参数完成了最小复现，第二次 Observe 返回 false。现有 TestNoProgressGuardCanonicalizesJSONArguments 传入的是 map[string]any，没有覆盖框架的实际参数形态。
如果保留这段实现，应为原始 JSON 字节提供专用规范化路径：使用 json.Decoder.UseNumber 解码、确保只有一个 JSON 值，再重新编码；同时明确非法 JSON 的回退合同。plugin/toolloopwarning.canonicalArguments 已有可参考实现，并且能保留大整数精度。
3. 阻塞性设计问题：必须与主干 plugin/toolloopwarning 统一公开 API 和职责归属
该分支最后更新后，#2490 已合入主干。当前 main 的 opt-in plugin/toolloopwarning 已经支持：
- 完整有序工具轮次比较；
- 基于 ToolCallID 的调用/结果关联，不依赖完成顺序；
- 原始 JSON 参数规范化；
- 最终模型可见工具结果比较；
- request/invocation 级状态；
- 排除预期轮询和后台工具；
- 不改变默认行为的 request-local 警告；
- 聚焦的文档和集成示例。
本 PR 将在 tool 根包新增四个长期公开符号，却没有生产集成或使用示例。目前除单测外没有代码调用 NoProgressGuard。两个公开入口之间的区别没有文档说明，而 NoProgressGuard 这个泛化名称也明显宽于实际的“精确、逐 observation、JSON 三元组计数”语义。
新 API 也没有任何框架接入点能够保证 observation 是模型最终看到的内容。从 AfterTool 调用时，拿到的是 result formatter 和 ToolResultMessages 替换之前的原始结果。不同原始值可能最终变成相同模型消息，相同原始值也可能被转换成不同消息；no-progress 判断必须基于模型真正看到的最终 transcript。
请先 rebase 到最新 main，再明确选择唯一、连贯的职责归属。更建议将轮次 detector 留在 plugin/toolloopwarning 内部，在剩余干预策略达成共识后扩展现有插件。
4. 当前 API 还不是“硬防护”
名称容易让使用者以为它会限制工具执行，但 Observe 只能在 observation 已产生之后返回一个布尔值。它不会注册回调、注入诊断、发出事件、返回 StopError、取消并行兄弟调用，也无法在下一次重复动作产生副作用之前短路执行。
若继续设计 opt-in 硬防护 V2，可以考虑以下保守方向：
- 保持现有默认行为和 warn-only 行为不变；
- 完整轮次精确重复后，注入警告并设置 invocation-local armed 状态；
- 如果模型紧接着再次选择相同有序 action bundle，则在执行该 bundle 前阻止，或根据显式选择的 policy 终止；
- 明确定义并行兄弟调用及取消语义；
- 保留逐工具排除，并为 progress comparator 留出扩展空间；
- 只暴露重复次数、工具名和安全摘要等诊断，不泄露工具结果内容；
- 保留已有最大调用次数/迭代次数作为最终安全网。
具体导出的 option 名称应先完成维护者认可的设计，而不是过早增加另一个泛化 helper。
5. 重要问题：生命周期、并发和资源成本合同仍不完整
如果该 helper 继续作为公开 API，Godoc 至少需要定义：
- 一个 guard 只代表一条逻辑上的、顺序化的 observation 流；
- 是否必须按 invocation 创建，以及是否禁止跨 session 共享；
- threshold 表示相同项的总出现次数，还是首次出现后的重复次数；
- 达到阈值后，后续相同项是否都会继续返回
true； - typed value、
[]byte和json.RawMessage的 JSON 等价规则； - 参数或 observation 任一序列化失败后的重置行为；
- 大型 observation 和自定义
json.Marshaler的行为预期。
目前代码在持有 mutex 时序列化并哈希调用方提供的任意值。大型或缓慢的 observation 会阻塞该 guard 的所有使用者，并可能完整分配模型结果。现有插件会先约束大型文本和二进制载荷，再生成最终轮次指纹。
6. 变更范围：请将 CI 修复拆成独立 PR
.github/scripts/check-go-mod-version.sh 的修改会改变仓库级独立校验行为：当发现匹配的本地目录 replace 时跳过下载探测。该修改目前不在最新 main 中，也不属于 no-progress guard 的设计范围。
如果它确实修复了当前主干上的真实问题，非常欢迎继续贡献。建议拆成一个聚焦的新 PR，关联独立 issue 或明确说明背景，在可行时补充针对性脚本测试，并使用能够描述 CI 结果的标题。这样维护者可以独立评审、独立合并 CI 修复，不必将它与公开框架 API 决策绑定。如果该提交只是为了同步另一项主干修改，请在 rebase 时移除。
当前标题也应调整为仓库要求的 tool: ... 格式，而不是 feat(tool): ...；如果最终仍新增公开 API，还应添加适当的 type/feature 和 type/api-change 标签。
当前实现做得好的部分
- 调用方不显式启用时，现有行为完全不变；
- nil receiver 安全地 fail open；
- 零值具有可用的最小阈值；
- 序列化失败不会把多个不支持的值压成同一个指纹；
Reset能正确清除计数状态；- mutex 消除了内部字段的数据竞争；
- 对于窄义的三元组计数器合同，实现小而清晰。
修订设计需要补充的测试
- 重复的有序双工具轮次；
- 并行结果以不同顺序完成；
- 并发 invocation 之间的状态隔离；
- 原始
[]byteJSON 的空白、键顺序变化和大整数； - action 改变但结果相同，以及 action 相同但结果改变；
- result formatter 和
ToolResultMessages转换之后的比较； - 显式排除的轮询工具；
- 警告后再次重复的干预行为；
- 大于 2 的阈值；
- observation 分支的序列化失败；
- 大型/多模态结果的有界处理。
已执行验证
GOWORK=off go test -count=1 ./tool：PR head 通过；GOWORK=off go test -race -count=1 ./tool：PR head 通过；- 临时合并最新
origin/main后，对./tool和./plugin/toolloopwarning分别执行普通测试及 race 测试：通过； bash -n .github/scripts/check-go-mod-version.sh：通过；git diff --check origin/main...origin/pr/2549：通过；- 使用语义等价原始
[]byteJSON 参数的临时回归测试：按上述分析失败；临时测试未提交。
建议处理方式
建议暂时保持 PR 打开，先 rebase 到最新 main，并讨论剩余目标是否应作为 plugin/toolloopwarning 的硬干预扩展。如果是，请围绕现有轮次级实现重新设计，同时保持 warn-only 默认行为不变。请将 CI 修复移动到独立 PR。欢迎继续共建，我也愿意继续评审后续聚焦后的修改。
mikemikimike
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Implemented the no-progress redesign against the current
Validation on commit
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Second-round review / 第二轮评审
Reviewed head: be3ceff09d1487d24c60f1e7486272054be4975f
Base: 723342184ed603be7155a7cfa5757f8d3ffde96d
English
Overall assessment
Thank you for the substantial redesign. This revision addresses the main architectural and correctness concerns from the previous review: it extends the existing plugin/toolloopwarning owner instead of adding a competing root tool.NoProgressGuard, uses invocation-local state, compares complete ordered tool rounds, correlates parallel results by ToolCallID, canonicalizes the actual raw JSON argument representation, compares model-visible results, preserves the warning-only default, and adds the requested opt-in warning-then-stop policy. The unrelated CI change is also absent from the final diff.
This is now the right general design and should remain open for another iteration; I no longer consider the PR superseded in substance. I am not ready to recommend merging this head, however, because the hard-stop path has one blocking integration bug: it fingerprints the raw AfterModel response, not the final tool-call bundle that the framework will execute.
Resolved since the previous review
- Package ownership and API overlap: resolved.
WithStopAfterWarningis a small option on the existing plugin rather than a second public detector API. - Complete multi-tool semantics: resolved. Detection works at the round barrier, restores result order using call IDs, and preserves the model's original call order.
- Production JSON argument shape: resolved for ordinary responses.
canonicalArgumentscorrectly handles raw[]byte, usesUseNumber, and rejects trailing values before re-encoding. - Model-visible observations and bounded results: resolved by reusing the existing round fingerprint path.
- Invocation isolation and polling exclusions: preserved from the existing plugin.
- Hard-policy timing: conceptually correct. The plugin warns after two identical completed rounds, arms the invocation, and attempts to stop a third identical action bundle before tools run.
- Scope: resolved. The final six-file diff is focused on
plugin/toolloopwarning; there is no CI-script change to split from this PR. - Validation quality: substantially improved. There are unit tests for canonical action fingerprints and fail-open branches, plus a runner integration test proving that an ordinary parallel third bundle is stopped before either tool executes.
Blocking finding: compare the post-normalization bundle that will execute
The new afterModel callback reads args.Response.Choices[0].Message.ToolCalls (or Delta.ToolCalls), fingerprints that raw value, and clears armedFingerprint before returning on a mismatch. In llmflow, however, all AfterModel callbacks run before:
- an
AfterModelcustom response is applied; - tool-call argument JSON repair; and
- text-to-tool-call repair.
The actual order is effectively:
toolloopwarning.AfterModel(raw response)
-> apply callback CustomResponse
-> repair tool-call argument JSON
-> repair text-form tool calls
-> emit/process response
-> execute tools
That creates a real bypass. I reproduced it with the guard armed for search({"query":"x","limit":1}) and a third model response containing search({"query":"x","limit":1,}). The guard returned no error and cleared its arm because the malformed raw bytes produced a different fallback fingerprint. The framework's supported JSON-repair stage then changed the response to {"query":"x","limit":1}, whose action fingerprint exactly matched the armed bundle. The third tool call would therefore execute despite the documented promise to stop it. This configuration is not merely hypothetical: OpenClaw enables tool-call argument JSON repair by default.
The same ordering problem applies to tool calls synthesized from text after callbacks and to callback-provided custom responses. Those may become the executable repeated bundle only after this guard has already failed open or has not run.
Please make the hard-stop decision against the final executable bundle—after callback response replacement and all enabled framework normalizers—or add an owning flow/processor hook at that boundary. Copying only the JSON-repair logic into this plugin would fix the reproduced case but would leave text repair and custom responses inconsistent, so the ownership and ordering contract should be solved once. Add an end-to-end regression test with agent.WithToolCallArgumentsJSONRepairEnabled(true) that asserts the repaired third bundle produces a StopError event and zero third-round tool executions. Coverage for text repair and custom-response composition would also pin down the public guarantee.
Public API and framework-design second pass
- Export necessity/ownership:
WithStopAfterWarningis externally useful and belongs toplugin/toolloopwarning. - API overlap: the revision removes the competing root API and extends the established contract coherently.
- Naming/extensibility: the option accurately describes the warn-then-stop policy while leaving the compatible default unchanged.
- Compatibility: existing callers of
New()remain warning-only; the new behavior is explicitly opt-in. - Lifecycle/concurrency: invocation-local state and mutex ownership are clear, and targeted race testing passes.
- Contract completeness: this remains incomplete until “before execution” is true for repaired and callback-replaced responses. Once fixed, the package documentation should state the normalization boundary if users need to reason about plugin composition.
- Validation: the integration test should also assert the emitted
stop_agent_errorevent and message, not only tool counters, so the caller-visible termination contract cannot regress silently.
Non-blocking PR metadata
- The primary affected package is
plugin/toolloopwarning, so a durable title such asplugin/toolloopwarning: stop repeated tool bundles after warningbetter followsCONTRIBUTING.mdthantool: add opt-in no-progress guard. - The first summary bullet says the PR adds
plugin/toolloopwarning, but that plugin is already onmain; please say that it extends the plugin with an opt-in stop policy. - The PR currently has no labels. Because it adds a public option and observable termination behavior,
type/featureandtype/api-changeare appropriate. Fixes #2346should be aligned with the intended issue disposition. The issue also lists observable repeat count/tool names and custom progress policy as goals. Either complete/track those follow-ups explicitly or useUpdates #2346if the issue should remain open.
Validation performed
GOWORK=off go test -count=1 ./plugin/toolloopwarning— passed.GOWORK=off go test -race -count=1 ./plugin/toolloopwarning— passed.GOWORK=off go test -count=1 ./plugin/...— passed.GOWORK=off go vet ./plugin/toolloopwarning— passed.git diff --check origin/main...HEAD— passed.- All 167 reported GitHub checks are complete and successful.
- A temporary JSON-repair regression test failed at the expected assertion because the guard returned
nilbefore repair; after repair, the executed bundle fingerprint equaled the armed fingerprint. The temporary test was removed and was not committed.
Recommended disposition
Keep this PR open. The redesign has resolved the previous reasons to treat it as superseded, and the focused extension is worth continuing. Please fix the post-normalization enforcement boundary and add the regression coverage above; after that, this should receive another focused review rather than being closed.
中文
总体结论
感谢贡献者进行这次实质性重构。本轮已经正面解决了上一轮最重要的架构与正确性问题：不再向根 tool 包增加一套竞争性的 NoProgressGuard，而是扩展现有 plugin/toolloopwarning；状态按 invocation 隔离；以完整有序工具轮次为单位比较；通过 ToolCallID 关联并行结果；正确规范化框架实际使用的原始 JSON 字节；比较模型最终可见的结果；保留默认仅警告行为；并新增显式 opt-in 的“警告后仍重复则停止”策略。最终 diff 也已经移除了无关 CI 修改。
因此，当前总体方向已经正确，建议继续保持 PR 打开；我不再认为它在实质上应被 #2490 直接取代。不过，这个 head 目前仍不宜合并，因为硬停止路径还有一个阻塞性的框架集成问题：它比较的是原始 AfterModel 响应，而不是框架最终真正要执行的工具调用 bundle。
上一轮问题的处理情况
- 包归属与 API 重叠：已解决。
WithStopAfterWarning是现有插件上的小型 option，不再引入第二套公开 detector API。 - 完整多工具语义：已解决。 detector 在完整 round barrier 上工作，按 call ID 恢复结果顺序，并保留模型输出的工具顺序。
- 生产环境 JSON 参数形态：普通响应场景已解决。
canonicalArguments能正确处理[]byte，使用UseNumber，并在重新编码前拒绝尾随 JSON 值。 - 模型可见 observation 与有界结果：已通过复用现有 round fingerprint 路径解决。
- invocation 隔离和轮询工具排除：继续正确保留。
- 硬策略的概念时序：正确。 两个相同完整轮次后先警告并 armed；模型再次选择相同 action bundle 时，尝试在工具执行前停止。
- 变更范围：已解决。 最终只修改
plugin/toolloopwarning的 6 个文件，不再包含需要拆分的 CI 脚本修改。 - 测试质量：显著提升。 新增了 action 指纹规范化、fail-open 分支单测，以及验证普通并行第三轮在两个工具执行前停止的 runner 集成测试。
阻塞问题：必须比较规范化之后、真正将被执行的 bundle
新的 afterModel 直接读取 args.Response.Choices[0].Message.ToolCalls（或 Delta.ToolCalls），对这个原始值计算指纹，并在不匹配时清空 armedFingerprint 后返回。但在 llmflow 中，所有 AfterModel callback 的执行位置早于以下步骤：
- 应用 callback 返回的
CustomResponse； - 修复工具参数 JSON；
- 把文本形式的工具调用修复为结构化
ToolCalls。
真实顺序相当于：
toolloopwarning.AfterModel（原始响应）
-> 应用 callback CustomResponse
-> 修复工具参数 JSON
-> 修复文本形式工具调用
-> 发出并处理响应
-> 执行工具
这会产生真实绕过。我用如下场景完成了最小复现：guard 已经针对 search({"query":"x","limit":1}) armed，第三次模型响应则返回 search({"query":"x","limit":1,})。由于非法原始 JSON 会走字节回退路径，guard 得到不同指纹，于是没有返回错误并清空 armed 状态。随后，框架支持的 JSON repair 将其修成 {"query":"x","limit":1}；修复后的 action 指纹与 armed 指纹完全相同，因此第三次工具调用仍会执行，违反“在第三次相同 bundle 执行前停止”的公开合同。这也不是极端配置：OpenClaw 默认启用了工具参数 JSON repair。
同一个回调顺序问题也会影响 callback 替换的响应，以及在 callback 之后才从文本修复出来的工具调用：它们可能直到 guard 已经 fail open、清空状态或根本没有运行之后，才变成最终可执行的重复 bundle。
请让硬停止判断基于最终可执行 bundle：即完成 callback 响应替换和所有已启用框架规范化之后再比较；或者在拥有该执行边界的 flow/processor 中增加合适的 hook。仅在插件内复制 JSON repair 虽能修复本次复现，却仍会遗漏文本修复和 CustomResponse，所以更建议一次性明确职责归属和顺序合同。请增加启用 agent.WithToolCallArgumentsJSONRepairEnabled(true) 的端到端回归测试，验证修复后的第三个 bundle 会产生 StopError 事件，并且第三轮工具执行次数为 0；也建议覆盖文本修复和 custom-response 组合。
公开 API 与框架设计第二遍审查
- 导出必要性/包归属：
WithStopAfterWarning对外部调用方有明确用途，也属于plugin/toolloopwarning。 - API 重叠： 本轮删除了竞争性的根 API，改为连贯扩展现有合同。
- 命名/扩展性： option 能准确描述“先警告、再停止”的策略，同时默认行为保持兼容。
- 兼容性： 现有
New()调用继续只警告；新行为必须显式启用。 - 生命周期/并发： invocation-local 状态和 mutex 所有权清晰，针对性 race test 通过。
- 合同完整性： 在 repair 和 callback 替换场景下真正满足“执行前停止”之前，合同仍不完整。修复后，如插件组合需要调用方理解规范化边界，也应在包文档中说明。
- 验证： runner 集成测试还应断言对外发出的
stop_agent_error事件及其消息，而不应只检查工具计数，避免调用方可观察的终止合同悄然回归。
非阻塞 PR 元数据建议
- 主包是
plugin/toolloopwarning，因此plugin/toolloopwarning: stop repeated tool bundles after warning比当前tool: add opt-in no-progress guard更符合CONTRIBUTING.md，也更能沉淀为准确的 squash commit 标题。 - Summary 第一条写成了“新增
plugin/toolloopwarning”，但该插件已经存在于main；应改为“扩展现有插件，加入 opt-in stop policy”。 - 当前 PR 没有 label。由于新增公开 option 和可观察的终止行为，建议添加
type/feature与type/api-change。 Fixes #2346需要与 issue 的预期处理对齐。该 issue 还把包含重复次数/工具名的可观察诊断以及自定义 progress policy 列为目标；可以补齐或明确跟踪后续工作，若 issue 仍需保留则改用Updates #2346。
已执行验证
GOWORK=off go test -count=1 ./plugin/toolloopwarning：通过；GOWORK=off go test -race -count=1 ./plugin/toolloopwarning：通过；GOWORK=off go test -count=1 ./plugin/...：通过；GOWORK=off go vet ./plugin/toolloopwarning：通过；git diff --check origin/main...HEAD：通过；- GitHub 上报告的 167 项检查均已完成且成功；
- 临时 JSON-repair 回归测试在预期位置失败：repair 前 guard 返回
nil，repair 后最终执行 bundle 的指纹与 armed 指纹相同。临时测试已删除，未提交到分支。
建议处理方式
请继续保持该 PR 打开。本轮重构已经消除了此前“应视为被取代”的主要理由，这个聚焦的扩展值得继续推进。修复最终规范化边界并补充上述回归测试后，再进行一次针对性复审，不建议现在关闭。
| if len(toolCalls) == 0 { | ||
| toolCalls = args.Response.Choices[0].Delta.ToolCalls | ||
| } | ||
| actualFingerprint, ok := fingerprintToolCalls(toolCalls) |
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[P1] Compare the final executable bundle before clearing the arm / 清空 armed 状态前应比较最终可执行 bundle
llmflow invokes AfterModel callbacks before it applies CustomResponse, repairs tool-call argument JSON, and repairs text-form tool calls. This code therefore fingerprints the raw response and line 162 clears the arm even when a downstream repair turns it into the same bundle that will execute. I reproduced this with an armed search({"query":"x","limit":1}) and a third raw response search({"query":"x","limit":1,}): this callback returned nil; JSON repair then produced the armed fingerprint, so the third call would run. Please enforce the policy after callback response replacement and all enabled normalizers (or introduce a hook at that owning execution boundary), and add an end-to-end JSON-repair regression test. The same ordering must be defined for text repair and custom responses.
llmflow 会先执行 AfterModel callback，之后才应用 CustomResponse、修复工具参数 JSON、以及把文本工具调用修成结构化调用。因此这里比较的是原始响应，而且第 162 行会提前清空 armed 状态；下游 repair 完全可能把它变成最终将执行的相同 bundle。最小复现中，armed action 是 search({"query":"x","limit":1})，第三次原始响应是 search({"query":"x","limit":1,})：本 callback 返回 nil，随后 JSON repair 得到与 armed action 相同的指纹，第三次调用仍会执行。请在 callback 响应替换和所有规范化完成后执行该策略（或在真正拥有执行边界的位置增加 hook），并补充启用 JSON repair 的端到端回归测试；文本修复和 custom response 也需要同样明确的顺序合同。
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Fixed in commit 24633beb.
The stop decision now runs through the new BeforeToolExecution boundary after callback custom-response replacement, enabled JSON-argument repair, text tool-call repair, and partial-response buffering, but before the response is emitted or any tool is dispatched. This makes the guard compare the final executable bundle and avoids clearing the armed state on a raw response that becomes identical only after normalization.
Added an end-to-end regression where the third repeated bundle uses trailing-comma JSON arguments; the framework repairs it and the guard still stops before the third tool execution. The project pre-PR gate passes.
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Coverage follow-up is in commit 44ffc171: the new execution-boundary hook paths are now covered, and the full PR check suite is green, including Codecov.
3 participants
Summary
plugin/toolloopwarningplugin for repeated complete tool rounds.ToolCallIDso completion order does not affect detection.WithStopAfterWarningarms the invocation after the warning and returnsagent.StopErrorbefore a third identical ordered tool bundle executes.Fixes #2346
Validation
go test ./plugin/toolloopwarning -count=1— passed.go test ./plugin/... -count=1— passed.go vet ./plugin/toolloopwarning— passed.codex-ci/go:1.26(go test ./plugin/toolloopwarning -count=1 && go vet ./plugin/toolloopwarning) — passed.