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debug-slow-spark-job
Diagnose slow, expensive, or regressed Apache Spark and PySpark applications by comparing runtime evidence against a healthy run. Use for long stages, stragglers, skew, shuffle, spill, garbage collection, poor parallelism, small files, slow scans, scheduler delay, executor imbala
概览
Diagnose slow, expensive, or regressed Apache Spark and PySpark applications by comparing runtime evidence against a healthy run. Use for long stages, stragglers, skew, shuffle, spill, garbage collection, poor parallelism, small files, slow scans, scheduler delay, executor imbalance, and unexplained compute-cost growth.
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Debug a slow Spark job
Find the root cause of the slowdown or cost growth. Compare against a healthy run whenever one exists, and normalize for input size before calling anything a regression.
Get the evidence
export SPARK_HISTORY_URL="https://history.example.com"
python3 scripts/spark_history_api.py slow --app-id <slow-application-id> > /tmp/spark-slow.json
python3 scripts/spark_history_api.py slow --app-id <healthy-application-id> > /tmp/spark-healthy.json
Run from this skill directory. If SPARK_HISTORY_URL is unset, find the server before asking the user: try http://localhost:18080, a running application's UI on http://localhost:4040, and the history-server or eventLog settings in the local Spark config; ask only when nothing responds. Authentication comes from SPARK_HISTORY_AUTHORIZATION, SPARK_HISTORY_COOKIE, or SPARK_HISTORY_HEADERS_JSON; never ask for credentials in chat and never disable TLS verification (--ca-file for a private CA).
Other subcommands: applications [--status completed|running] to find app IDs, sql-list --app-id <id> and sql --app-id <id> --execution-id <n> for the executed plan with per-node metrics, failure --app-id <id> for failed-stage detail; all accept --stage-limit N --task-limit N. For anything the profiles omit, call $SPARK_HISTORY_URL/api/v1 directly with the same auth headers: /applications/{app}/jobs, /stages/{stage}/{attempt}/taskSummary?quantiles=0.05,0.5,0.95, /stages/{stage}/{attempt}/taskList?sortBy=-runtime, /allexecutors, /environment, /sql/{execution}?details=true&planDescription=true.
In taskSummary, metric arrays align with quantiles [0, 0.5, 0.95, 0.99, 1.0]: the middle entry is the median, the last is the max. Read spark.master and deploy mode from environment.sparkProperties to know where driver and executor logs live. Compare stage timelines between the two runs and start where they first diverge; wall time alone mixes queue time, driver work, execution, and commit.
Likeliest causes, in order, and how to check each
-
Skew. Max far above median for run time, input, or shuffle read in one stage:
jq '.longestStages[] | {stage: .stage.stageId, quantiles: .taskSummary.quantiles, run: .taskSummary.executorRunTime, input: .taskSummary.inputMetrics.bytesRead, shuffleRead: .taskSummary.shuffleReadMetrics.readBytes}' /tmp/spark-slow.json.longestStages[].tasksnames the hot partitions and hosts. Check the executed plan (sqlsubcommand) for AQE skew handling (skewed=true) before proposing salting. -
Wrong partition count. Tasks uniformly large and spilling mean too few; tens of thousands of sub-second tasks mean scheduler overhead:
jq '{stageTasks: [.longestStages[].stage | {id: .stageId, tasks: .numTasks}], totalCores: ([.allExecutors[] | select(.isActive) | .totalCores] | add), conf: [.environment.sparkProperties[] | select(.[0] | test("shuffle.partitions|executor.cores"))]}' /tmp/spark-slow.jsonTry
spark.sql.shuffle.partitionsor AQE targets before inserting explicit repartitions. -
Excess spill. Spill without skew means operator state outgrew execution memory:
jq '.longestStages[] | {stage: .stage.stageId, memSpill: .taskSummary.memoryBytesSpilled, diskSpill: .taskSummary.diskBytesSpilled}' /tmp/spark-slow.jsonReduce state (narrower rows, partial aggregation) or raise partitions before raising memory.
-
Large shuffles. Shuffle bytes dominating stage runtime:
jq '.longestStages[].stage | {id: .stageId, shuffleRead: .shuffleReadBytes, shuffleWrite: .shuffleWriteBytes, run: .executorRunTime}' /tmp/spark-slow.jsonMap the stage to its
Exchangein the executed plan and ask whether the shuffle is avoidable: broadcast, pre-aggregation, or already-partitioned data. -
Slow shuffle fetch. Low CPU with high fetch wait or heavy remote reads:
jq '.longestStages[] | {stage: .stage.stageId, fetchWait: .taskSummary.shuffleReadMetrics.fetchWaitTime, remote: .taskSummary.shuffleReadMetrics.remoteBytesRead}' /tmp/spark-slow.jsonDead entries in
.allExecutors[] | select(.isActive | not)mean data was refetched or recomputed. Ifenvironmentshows Celeborn or an external shuffle service, confirm from the driver log it actually served the shuffle before tuning it. -
GC pressure. GC a large fraction of run time:
jq '{stages: [.longestStages[] | {id: .stage.stageId, gc: .taskSummary.jvmGcTime, run: .taskSummary.executorRunTime}], executors: [.allExecutors[] | {id, gc: .totalGCTime, dur: .totalDuration}]}' /tmp/spark-slow.jsonCheck peak memory, cache use, and object-heavy code before resizing heaps.
-
Python UDF transport. Time concentrated at Python boundaries in the plan:
python3 scripts/spark_history_api.py sql --app-id <id> --execution-id <n> | jq '.sqlExecution.nodes[] | select(.nodeName | test("Python")) | {nodeName, metrics}'Prefer native expressions or vectorized UDFs over resource changes.
-
Retry churn. Failures that succeeded on retry inflate runtime without failing the job:
jq '{stages: [.longestStages[].stage | select(.numFailedTasks > 0) | {id: .stageId, failed: .numFailedTasks}], jobs: [.jobs[] | select(.numFailedTasks > 0) | {jobId, failed: .numFailedTasks}]}' /tmp/spark-slow.jsonFind the flaky cause (one bad host, preemption, timeouts) in the executor log or node events.
-
Scan overhead. Long scans with little output:
python3 scripts/spark_history_api.py sql --app-id <id> --execution-id <n> | jq '.sqlExecution.nodes[] | select(.nodeName | startswith("Scan")) | {nodeName, metrics}'Too many small files, missing partition or pushed filters, or slow storage.
-
Driver and queue time. Gaps before the first task or between jobs:
jq '[.jobs[] | {jobId, submissionTime, completionTime}] | sort_by(.submissionTime)' /tmp/spark-slow.jsonThat time is planning, file listing, queueing, or provisioning: check the driver log for what it was doing, not stage tuning.
The commands above are starting points, not limits: compose your own jq, call the REST API directly, or pull logs, code, and platform state when a question needs it. Rule each candidate in or out with evidence, and when a signal is suggestive but not conclusive, go a level deeper (more task samples, the exact log lines, the executed plan) until you are confident it is or is not the cause. Do not settle for the first plausible explanation.
For a regression, end by naming what changed: code, data volume or distribution, configuration (diff the two snapshots' environment), or infrastructure. Adding memory for a skewed partition, adding executors when task count caps parallelism, and caching once-used data are common wrong answers.
Report
State the root cause and confidence, the first divergent stage, the evidence for and against, alternatives you rejected, and the most likely fix. Do not change production settings or launch expensive reruns without approval.
文件元数据
name: debug-slow-spark-job description: Diagnose slow, expensive, or regressed Apache Spark and PySpark applications by comparing runtime evidence against a healthy run. Use for long stages, stragglers, skew, shuffle, spill, garbage collection, poor parallelism, small files, slow scans, scheduler delay, executor imbalance, and unexplained compute-cost growth.
查看原始文本
---
name: debug-slow-spark-job
description: Diagnose slow, expensive, or regressed Apache Spark and PySpark applications by comparing runtime evidence against a healthy run. Use for long stages, stragglers, skew, shuffle, spill, garbage collection, poor parallelism, small files, slow scans, scheduler delay, executor imbalance, and unexplained compute-cost growth.
---
# Debug a slow Spark job
Find the root cause of the slowdown or cost growth. Compare against a healthy run whenever one exists, and normalize for input size before calling anything a regression.
## Get the evidence
```bash
export SPARK_HISTORY_URL="https://history.example.com"
python3 scripts/spark_history_api.py slow --app-id <slow-application-id> > /tmp/spark-slow.json
python3 scripts/spark_history_api.py slow --app-id <healthy-application-id> > /tmp/spark-healthy.json
```
Run from this skill directory. If `SPARK_HISTORY_URL` is unset, find the server before asking the user: try `http://localhost:18080`, a running application's UI on `http://localhost:4040`, and the history-server or eventLog settings in the local Spark config; ask only when nothing responds. Authentication comes from `SPARK_HISTORY_AUTHORIZATION`, `SPARK_HISTORY_COOKIE`, or `SPARK_HISTORY_HEADERS_JSON`; never ask for credentials in chat and never disable TLS verification (`--ca-file` for a private CA).
Other subcommands: `applications [--status completed|running]` to find app IDs, `sql-list --app-id <id>` and `sql --app-id <id> --execution-id <n>` for the executed plan with per-node metrics, `failure --app-id <id>` for failed-stage detail; all accept `--stage-limit N --task-limit N`. For anything the profiles omit, call `$SPARK_HISTORY_URL/api/v1` directly with the same auth headers: `/applications/{app}/jobs`, `/stages/{stage}/{attempt}/taskSummary?quantiles=0.05,0.5,0.95`, `/stages/{stage}/{attempt}/taskList?sortBy=-runtime`, `/allexecutors`, `/environment`, `/sql/{execution}?details=true&planDescription=true`.
In `taskSummary`, metric arrays align with `quantiles` `[0, 0.5, 0.95, 0.99, 1.0]`: the middle entry is the median, the last is the max. Read `spark.master` and deploy mode from `environment.sparkProperties` to know where driver and executor logs live. Compare stage timelines between the two runs and start where they first diverge; wall time alone mixes queue time, driver work, execution, and commit.
## Likeliest causes, in order, and how to check each
1. **Skew.** Max far above median for run time, input, or shuffle read in one stage:
```bash
jq '.longestStages[] | {stage: .stage.stageId, quantiles: .taskSummary.quantiles, run: .taskSummary.executorRunTime, input: .taskSummary.inputMetrics.bytesRead, shuffleRead: .taskSummary.shuffleReadMetrics.readBytes}' /tmp/spark-slow.json
```
`.longestStages[].tasks` names the hot partitions and hosts. Check the executed plan (`sql` subcommand) for AQE skew handling (`skewed=true`) before proposing salting.
2. **Wrong partition count.** Tasks uniformly large and spilling mean too few; tens of thousands of sub-second tasks mean scheduler overhead:
```bash
jq '{stageTasks: [.longestStages[].stage | {id: .stageId, tasks: .numTasks}], totalCores: ([.allExecutors[] | select(.isActive) | .totalCores] | add), conf: [.environment.sparkProperties[] | select(.[0] | test("shuffle.partitions|executor.cores"))]}' /tmp/spark-slow.json
```
Try `spark.sql.shuffle.partitions` or AQE targets before inserting explicit repartitions.
3. **Excess spill.** Spill without skew means operator state outgrew execution memory:
```bash
jq '.longestStages[] | {stage: .stage.stageId, memSpill: .taskSummary.memoryBytesSpilled, diskSpill: .taskSummary.diskBytesSpilled}' /tmp/spark-slow.json
```
Reduce state (narrower rows, partial aggregation) or raise partitions before raising memory.
4. **Large shuffles.** Shuffle bytes dominating stage runtime:
```bash
jq '.longestStages[].stage | {id: .stageId, shuffleRead: .shuffleReadBytes, shuffleWrite: .shuffleWriteBytes, run: .executorRunTime}' /tmp/spark-slow.json
```
Map the stage to its `Exchange` in the executed plan and ask whether the shuffle is avoidable: broadcast, pre-aggregation, or already-partitioned data.
5. **Slow shuffle fetch.** Low CPU with high fetch wait or heavy remote reads:
```bash
jq '.longestStages[] | {stage: .stage.stageId, fetchWait: .taskSummary.shuffleReadMetrics.fetchWaitTime, remote: .taskSummary.shuffleReadMetrics.remoteBytesRead}' /tmp/spark-slow.json
```
Dead entries in `.allExecutors[] | select(.isActive | not)` mean data was refetched or recomputed. If `environment` shows Celeborn or an external shuffle service, confirm from the driver log it actually served the shuffle before tuning it.
6. **GC pressure.** GC a large fraction of run time:
```bash
jq '{stages: [.longestStages[] | {id: .stage.stageId, gc: .taskSummary.jvmGcTime, run: .taskSummary.executorRunTime}], executors: [.allExecutors[] | {id, gc: .totalGCTime, dur: .totalDuration}]}' /tmp/spark-slow.json
```
Check peak memory, cache use, and object-heavy code before resizing heaps.
7. **Python UDF transport.** Time concentrated at Python boundaries in the plan:
```bash
python3 scripts/spark_history_api.py sql --app-id <id> --execution-id <n> | jq '.sqlExecution.nodes[] | select(.nodeName | test("Python")) | {nodeName, metrics}'
```
Prefer native expressions or vectorized UDFs over resource changes.
8. **Retry churn.** Failures that succeeded on retry inflate runtime without failing the job:
```bash
jq '{stages: [.longestStages[].stage | select(.numFailedTasks > 0) | {id: .stageId, failed: .numFailedTasks}], jobs: [.jobs[] | select(.numFailedTasks > 0) | {jobId, failed: .numFailedTasks}]}' /tmp/spark-slow.json
```
Find the flaky cause (one bad host, preemption, timeouts) in the executor log or node events.
9. **Scan overhead.** Long scans with little output:
```bash
python3 scripts/spark_history_api.py sql --app-id <id> --execution-id <n> | jq '.sqlExecution.nodes[] | select(.nodeName | startswith("Scan")) | {nodeName, metrics}'
```
Too many small files, missing partition or pushed filters, or slow storage.
10. **Driver and queue time.** Gaps before the first task or between jobs:
```bash
jq '[.jobs[] | {jobId, submissionTime, completionTime}] | sort_by(.submissionTime)' /tmp/spark-slow.json
```
That time is planning, file listing, queueing, or provisioning: check the driver log for what it was doing, not stage tuning.
The commands above are starting points, not limits: compose your own jq, call the REST API directly, or pull logs, code, and platform state when a question needs it. Rule each candidate in or out with evidence, and when a signal is suggestive but not conclusive, go a level deeper (more task samples, the exact log lines, the executed plan) until you are confident it is or is not the cause. Do not settle for the first plausible explanation.
For a regression, end by naming what changed: code, data volume or distribution, configuration (diff the two snapshots' `environment`), or infrastructure. Adding memory for a skewed partition, adding executors when task count caps parallelism, and caching once-used data are common wrong answers.
## Report
State the root cause and confidence, the first divergent stage, the evidence for and against, alternatives you rejected, and the most likely fix. Do not change production settings or launch expensive reruns without approval.
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安装前审查: 避免自动安装
许可证: Apache-2.0
- Dependency or permission surface needs review
- Permission surface may require sandboxing
- Financial research output is not financial advice; require human review before any live investment decision
- SKILL.md says that when SPARK_HISTORY_URL is unset the agent should try localhost:18080/4040 and Spark config before asking the user, but spark_history_api.py only exits with 'Set --base-url or SPARK_HISTORY_URL'. The discovery behavior is described but not implemented in the script, so the agent must manually probe or pass --base-url to match the documented workflow.
- The skill has no explicit Setup/Requirements section. It assumes Python 3, jq, network access to the history server, and the script directory as the working directory. These prerequisites should be stated directly in SKILL.md.
- Financial research output is not financial advice; require human review before any live investment decision.
- Quality score needs review
- Permission surface needs review: secrets or environment access, shell or command execution
- GitHub adoption: 51 GitHub stars
- Stars/forks activity: 51 stars, 13 forks; issue activity unavailable in current metadata
- Dependency/runtime risk: command execution surface, credential or environment access
- Permission surface: secrets or environment access, shell or command execution
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- 来源仓库
- EmbrasureAI/spark-observability-skills
- 许可证
- Apache-2.0
- 版本
- 1.0.0
- 最近 GitHub 推送
- 2026年8月4日
- 目录更新于
- 2026年9月9日
版本来自目录元数据,使用前请核实来源发布记录。
质量
58/100
有潜力
信任
53/100
Do not auto-install
审计
69/100
需审查
- Dependency or permission surface needs review
- Permission surface may require sandboxing
- Financial research output is not financial advice; require human review before any live investment decision
- SKILL.md says that when SPARK_HISTORY_URL is unset the agent should try localhost:18080/4040 and Spark config before asking the user, but spark_history_api.py only exits with 'Set --base-url or SPARK_HISTORY_URL'. The discovery behavior is described but not implemented in the script, so the agent must manually probe or pass --base-url to match the documented workflow.
- The skill has no explicit Setup/Requirements section. It assumes Python 3, jq, network access to the history server, and the script directory as the working directory. These prerequisites should be stated directly in SKILL.md.
- Financial research output is not financial advice; require human review before any live investment decision.
- Quality score needs review
- Permission surface needs review: secrets or environment access, shell or command execution
- GitHub adoption: 51 GitHub stars
- Stars/forks activity: 51 stars, 13 forks; issue activity unavailable in current metadata
- Dependency/runtime risk: command execution surface, credential or environment access
- Permission surface: secrets or environment access, shell or command execution
- Verified installs
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"manifest_url": "https://www.openagentskill.com/api/registry/manifest/embrasureai-debug-slow-spark-job"
},
"trust": {
"score": 61,
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"version": "trust-score-v4",
"install_policy": "block",
"evidence": {
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"repoActivity": "51 stars, 13 forks",
"lastPushed": "2mo since push",
"license": "Apache-2.0",
"repository": "https://github.com/EmbrasureAI/spark-observability-skills/tree/main/skills/debug-slow-spark-job",
"install": "npx skills add EmbrasureAI/spark-observability-skills --skill debug-slow-spark-job",
"installSafety": "standard package or runtime install path",
"permissionSurface": "secrets or environment access, shell or command execution",
"documentation": "Strong README/SKILL.md context",
"agentOutcomes": "No agent outcome data yet"
},
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"successes": 0,
"failures": 0,
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"label": "No agent outcome data yet"
},
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"allowed": false,
"sandbox_required": true,
"reason": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
},
"best_for": [
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"agent-skill"
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"SKILL.md says that when SPARK_HISTORY_URL is unset the agent should try localhost:18080/4040 and Spark config before asking the user, but spark_history_api.py only exits with 'Set --base-url or SPARK_HISTORY_URL'. The discovery behavior is described but not implemented in the script, so the agent must manually probe or pass --base-url to match the documented workflow.",
"Financial research output is not financial advice; require human review before any live investment decision.",
"Quality score needs review",
"Permission surface needs review: secrets or environment access, shell or command execution",
"GitHub adoption: 51 GitHub stars",
"Stars/forks activity: 51 stars, 13 forks; issue activity unavailable in current metadata",
"Dependency/runtime risk: command execution surface, credential or environment access",
"Permission surface: secrets or environment access, shell or command execution"
]
},
"agent_proven": {
"version": "agent-proven-v1",
"score": 0,
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"label": "Needs first agent run",
"summary": "No agent outcome reports yet. Use Resolve, run one narrow sandbox task, then report the result.",
"metrics": {
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"successfulOutcomes": 0,
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"installAttempts": 0,
"installSuccessRate": null,
"successRate": null,
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"avgTimeToUsefulMs": null,
"productionOutcomes": 0,
"humanReviewRequired": 0,
"uniqueAgents": 0,
"lastOutcomeAt": null
},
"signals": [],
"penalties": [
"No real agent outcome evidence yet"
]
},
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"score": 69,
"risk_level": "needs_review",
"risk_label": "Needs review",
"warnings": [
"Dependency or permission surface needs review",
"Permission surface may require sandboxing",
"Financial research output is not financial advice; require human review before any live investment decision",
"SKILL.md says that when SPARK_HISTORY_URL is unset the agent should try localhost:18080/4040 and Spark config before asking the user, but spark_history_api.py only exits with 'Set --base-url or SPARK_HISTORY_URL'. The discovery behavior is described but not implemented in the script, so the agent must manually probe or pass --base-url to match the documented workflow.",
"The skill has no explicit Setup/Requirements section. It assumes Python 3, jq, network access to the history server, and the script directory as the working directory. These prerequisites should be stated directly in SKILL.md.",
"Financial research output is not financial advice; require human review before any live investment decision.",
"Quality score needs review",
"Permission surface needs review: secrets or environment access, shell or command execution"
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},
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"label": "Blocked for auto-install",
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"blocked": true,
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},
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"score": 58,
"label": "Promising"
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"supply": {
"track": "Coding and developer agents",
"scenario": "Coding agents",
"maintenance": "2mo since push",
"risk": "Needs review"
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"do_not_use_when": [
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"production agents without a repository review",
"SKILL.md says that when SPARK_HISTORY_URL is unset the agent should try localhost:18080/4040 and Spark config before asking the user, but spark_history_api.py only exits with 'Set --base-url or SPARK_HISTORY_URL'. The discovery behavior is described but not implemented in the script, so the agent must manually probe or pass --base-url to match the documented workflow.",
"High-risk permission hints: Shell or command execution, Secrets or environment access",
"Dependency or permission surface needs review",
"Permission surface may require sandboxing",
"Financial research output is not financial advice; require human review before any live investment decision",
"The skill has no explicit Setup/Requirements section. It assumes Python 3, jq, network access to the history server, and the script directory as the working directory. These prerequisites should be stated directly in SKILL.md."
],
"agent_contract": {
"task_input": "Use debug-slow-spark-job in an agent workflow",
"recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
"install_policy": "block",
"minimum_review_before_use": [
"Trust: 61/100 Manual review",
"Audit: 69/100 Needs review",
"Safety: 25/100 Avoid automatic install",
"Review repository, license, install command, and permission surface before production use."
],
"expected_agent_output": {
"selected_skill": "embrasureai-debug-slow-spark-job (debug-slow-spark-job)",
"install_command": "npx skills add EmbrasureAI/spark-observability-skills --skill debug-slow-spark-job",
"risk_summary": "Needs review; Blocked for auto-install; Review before production",
"verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
}
},
"outcome_feedback": {
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"method": "POST",
"requires_resolve_event_id": true,
"event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
"expected_outcomes": [
"success",
"failed",
"not_relevant",
"blocked_by_risk",
"setup_required"
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"skill_slug": "embrasureai-debug-slow-spark-job",
"task": "Use debug-slow-spark-job in an agent workflow",
"agent": "codex",
"outcome": "success",
"install_used": true,
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"setup_required": false,
"task_success": true,
"output_quality": 4,
"error_type": null,
"human_review_required": false,
"workspace": "sandbox",
"time_to_useful_ms": 120000,
"notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
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},
"endpoints": {
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"api": "https://www.openagentskill.com/api/agent/skills/embrasureai-debug-slow-spark-job",
"audit": "https://www.openagentskill.com/skills/embrasureai-debug-slow-spark-job/audit",
"eval": "https://www.openagentskill.com/api/agent/evals?slug=embrasureai-debug-slow-spark-job&task=Use%20debug-slow-spark-job%20in%20an%20agent%20workflow&max_risk=medium",
"resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20debug-slow-spark-job%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
"receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20debug-slow-spark-job%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
"install": "https://www.openagentskill.com/api/skills/embrasureai-debug-slow-spark-job/install",
"manifest": "https://www.openagentskill.com/api/registry/manifest/embrasureai-debug-slow-spark-job"
}
}创作者工具
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