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 agentmods add skills/cockroachdb/cursor-plugin/designing-application-transactionsnpx skills add cockroachdb/cursor-plugin --skill designing-application-transactionsgit clone --depth 1 https://github.com/cockroachdb/cursor-pluginWhat 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 | $0.00102 | $0.05159 |
| Opus 5 | $0.00051 | $0.02580 |
| Sonnet 5 | $0.00020 | $0.01032 |
| Haiku 4.5 | $0.00010 | $0.00516 |
Grade A, and why
designing-application-transactions scanned grade A with 0 findings 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 2d 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
This is a copy
100% identical to designing-application-transactions — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 594 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Designing Application Transactions
Guides application developers through the design principles and implementation patterns needed to build correct, performant, and resilient applications on CockroachDB. Covers the full spectrum from transaction scoping and retry logic to connection pooling and observability.
Complement to SQL skills: For SQL syntax, schema design, and query optimization, see cockroachdb-sql. For benchmarking transaction formulations under contention, see benchmarking-transaction-patterns.
When to Use This Skill
- Designing transaction boundaries for a CockroachDB application
- Implementing client-side retry logic with exponential backoff
- Deciding between implicit and explicit transactions
- Choosing between optimistic and pessimistic concurrency control
- Replacing read-modify-write loops with atomic SQL
- Configuring connection pools (HikariCP, pgbouncer, etc.)
- Implementing keyset pagination instead of OFFSET/LIMIT
- Using follower reads for reporting and analytics queries
- Separating business orchestration from database transactions
- Using prepared statements for performance and security
- Selecting explicit column projections instead of SELECT *
- Testing application behavior under concurrency
- Monitoring application-level database performance
Prerequisites
- Familiarity with CockroachDB's SERIALIZABLE isolation level
- Understanding of ACID transaction semantics
- Access to application source code for transaction design changes
- SQL connection to a CockroachDB cluster (for testing and validation)
Steps
1. Keep Transactions Short-Lived
Transactions must include only the minimal set of SQL operations needed for one atomic state change. Do not place remote API calls, service-to-service requests, loops, expensive computation, or artificial waits inside a CockroachDB transaction.
Long-lived transactions increase intent lifetime, contention, and retry probability in CockroachDB's distributed, optimistic-concurrency architecture.
What ships with it
1 file 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.
- 2d ago First seen · 594 lines · 102 tokens per session scan A cab9641fca14
designing-application-transactions is a skill published in the GitHub repository cockroachdb/cursor-plugin (1 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 102 tokens to every session and 5,159 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to designing-application-transactions, differing in 0 lines, and is treated as a copy.
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