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/mitsuhiko/agent-stuff/sentrynpx skills add mitsuhiko/agent-stuff --skill sentrygit clone --depth 1 https://github.com/mitsuhiko/agent-stuffWhat 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 | $0.00034 | $0.01978 |
| Opus 5 | $0.00017 | $0.00989 |
| Sonnet 5 | $0.00007 | $0.00396 |
| Haiku 4.5 | $0.00003 | $0.00198 |
Grade A, and why
sentry 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.
How it starts
The opening of the file, as written. The whole thing — 240 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Sentry Skill
Access Sentry data via the API for debugging and investigation. Uses auth token from ~/.sentryclirc.
Quick Reference
| Task | Command |
|---|---|
| Find errors on a date | search-events.js --org X --start 2025-12-23T15:00:00 --level error |
| List open issues | list-issues.js --org X --status unresolved |
| Get issue details | fetch-issue.js <issue-id-or-url> --latest |
| Get event details | fetch-event.js <event-id> --org X --project Y |
| Search logs | search-logs.js --org X --project Y "level:error" |
Common Debugging Workflows
"What went wrong at this time?"
Find events around a specific timestamp:
# Find all events in a 2-hour window
./scripts/search-events.js --org myorg --project backend \
--start 2025-12-23T15:00:00 --end 2025-12-23T17:00:00
# Filter to just errors
./scripts/search-events.js --org myorg --start 2025-12-23T15:00:00 \
--level error
# Find a specific transaction type
./scripts/search-events.js --org myorg --start 2025-12-23T15:00:00 \
--transaction process-incoming-email
"What errors have occurred recently?"
# List unresolved errors from last 24 hours
./scripts/list-issues.js --org myorg --status unresolved --level error --period 24h
# Find high-frequency issues
./scripts/list-issues.js --org myorg --query "times_seen:>50" --sort freq
# Issues affecting users
./scripts/list-issues.js --org myorg --query "is:unresolved has:user" --sort user
"Get details about a specific issue/event"
# Get issue with latest stack trace
./scripts/fetch-issue.js 5765604106 --latest
./scripts/fetch-issue.js https://sentry.io/organizations/myorg/issues/123/ --latest
./scripts/fetch-issue.js MYPROJ-123 --org myorg --latest
# Get specific event with all breadcrumbs
./scripts/fetch-event.js abc123def456 --org myorg --project backend --breadcrumbs
"Find events with a specific tag"
# Find by custom tag (e.g., thread_id, user_id)
./scripts/search-events.js --org myorg --tag thread_id:th_abc123
# Find by user email
./scripts/search-events.js --org myorg --query "user.email:*@example.com"
What ships with it
6 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.
- 2d ago First seen · 240 lines · 34 tokens per session scan A 78f8229cfe66
sentry is a skill published in the GitHub repository mitsuhiko/agent-stuff (3,032 stars, last pushed yesterday), licensed Apache-2.0. It adds 34 tokens to every session and 1,978 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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