Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add StarRocks/starrocks-debug-skills --skill data-lakegit clone --depth 1 https://github.com/StarRocks/starrocks-debug-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/starrocks/starrocks-debug-skills/data-lake)<a href="https://agentmods.dev/skills/starrocks/starrocks-debug-skills/data-lake"><img src="https://agentmods.dev/badge/skills/starrocks/starrocks-debug-skills/data-lake.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00080 | $0.05984 |
| Opus 5 | $0.00040 | $0.02992 |
| Sonnet 5 | $0.00016 | $0.01197 |
| Haiku 4.5 | $0.00008 | $0.00598 |
Grade A, and why
data-lake scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -v --connect-timeout 10 http://<s3-endpoint>/<bucket>/<key> How it starts
The opening of the file, as written. The whole thing — 629 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Data Lake / External Table Troubleshooting
Investigation guide for Hive Metastore connectivity, Kerberos authentication, HDFS/S3 access errors, and external catalog query failures.
Five root causes account for the vast majority of cases:
- Cause A — HMS connectivity failure or metadata listing too slow
- Cause B — Kerberos authentication failure (expired keytab or clock skew)
- Cause C — S3 / object storage access or rate-limit error
- Cause D — Network saturation from HMS traffic on CN/BE nodes
- Cause E — Metadata cache staleness (Hive partitions, Iceberg snapshots)
Metric Taxonomy — Read This First
Before using any diagnostic commands, understand the observable signals for external table issues.
FE log signals (fe.log)
| Signal | Meaning |
|---|---|
Start to connect to Hive metastore + no subsequent Connected |
HMS TCP connection blocking or timing out |
getPartitions / listPartitions with high elapsed ms |
HMS partition listing slow (large partition count or HMS overload) |
Finished replaying journal never appears after HMS connect attempt |
HMS blocking FE startup sequence |
AuthenticationException from catalog connector |
Kerberos ticket invalid or HMS auth rejected |
BE log signals (be.log / be.WARNING)
| Signal | Meaning |
|---|---|
GSS initiate failed |
Kerberos GSSAPI handshake failed — expired keytab or JCE missing |
javax.security.sasl.SaslException |
SASL negotiation failed — auth or encryption mismatch |
503 reduce request rate |
S3 rate limit hit — partition prefix count too low |
Filesystem closed |
HDFS NameNode cache too small — hdfs_client_max_cache_size must exceed NN count |
| Network I/O bytes/sec approaching NIC capacity | External scan saturating link |
Network / thread signals
| Signal | Meaning |
|---|---|
jstack shows threads blocked on TFilterTransport.readAll |
HMS RPC call blocking; HMS slow or overloaded |
sar -n DEV 1 5 shows RX/TX near line rate on CN/BE host |
Network saturation from remote scan |
netstat -s | grep retransmit spike during external scan |
Packet loss from bandwidth burst |
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 8d ago First seen · 629 lines · 80 tokens per session scan A f186cfed6806
data-lake is a skill published in the GitHub repository StarRocks/starrocks-debug-skills (75 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 80 tokens to every session and 5,984 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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