Borrowing it
Nothing to install: this file belongs to BlackbirdWorks/gopherstack. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/BlackbirdWorks/gopherstack/main/.claude/skills/gopherstack-service-op/SKILL.mdgit clone --depth 1 https://github.com/BlackbirdWorks/gopherstackWrote 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/blackbirdworks/gopherstack/gopherstack-service-op)<a href="https://agentmods.dev/skills/blackbirdworks/gopherstack/gopherstack-service-op"><img src="https://agentmods.dev/badge/skills/blackbirdworks/gopherstack/gopherstack-service-op/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/blackbirdworks/gopherstack/gopherstack-service-op"><img src="https://agentmods.dev/badge/skills/blackbirdworks/gopherstack/gopherstack-service-op.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00104 | $0.02719 |
| Opus 5.5 | $0.00042 | $0.01088 |
| Sonnet 5.5 | $0.00021 | $0.00544 |
| Haiku 4.5 | $0.00010 | $0.00272 |
Grade A, and why
gopherstack-service-op 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 yesterday.
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 — 205 lines — stays where its author put it; the contents beside it link to each section on GitHub.
gopherstack-service-op
Hard rule: shapes from the SDK, not memory
Before writing any wire struct, field name, error code, or timestamp format, run the
gopherstack-sdk-shape skill for that op and read its output. Run scripts/dev/svcops.sh <svc>
before and after to confirm the op's status. If missing on your branch, it's in PR #2493 / main after merge.
No-stub rule first
Never ship a stub: no-op handlers, &StubOutput{}, fabricated IDs, or an op
that returns success without touching real state. Every routed operation must
mutate/read real backend state, return AWS-accurate shapes and error codes,
and persist when persistence is on. If an operation genuinely cannot be
implemented (no real AWS data source can exist in an emulator), say so
explicitly and record it as a structural gap in PARITY.md — never ship a
half-working stub silently. This is the rule most likely to slip under time
pressure; check your own diff against it before calling the op done.
File anatomy
| file | role |
|---|---|
handler.go |
Handler struct, NewHandler, service.Registerable methods (Name, GetSupportedOperations, Reset, RouteMatcher, MatchPriority, ExtractOperation, ExtractResource), route dispatch, Handler() echo entrypoint, handleError/classifyError |
handler_<family>.go |
HTTP handler funcs for one resource family: decode → call backend → marshal. Pure translation, no business logic |
<family>.go (e.g. workspaces.go) |
backend methods (b *InMemoryBackend) CreateWorkspace(...): validate, lock, mutate |
store.go |
InMemoryBackend struct, NewInMemoryBackend, Reset, ID generators, ARN builders |
store_setup.go |
registerAllTables — store.Register(b.registry, "name", store.New(keyFn)) per collection + AddIndex |
wire.go |
wire DTO structs mirroring SDK field names/casing, doc-comment citing the SDK source that confirms the shape |
wire_convert.go |
toXWire/fromXWire mappers |
errors.go |
sentinel errors, apiError struct, constructors (notFoundError/conflictError/validationError/quotaError) |
consts.go |
path-segment + JSON-key literals reused 3+ times |
provider.go |
Provider implementing service.Provider (Name, Init) — what internal/app/cli.go registers |
persistence.go |
backendSnapshot struct + Snapshot/Restore |
tags.go / handler_tags.go |
TagResource/UntagResource/ListTagsForResource/TaggedResources |
cross_service.go |
lazy sibling-service lookups via a structurally-matched siblingServices interface |
chaos_transitions.go |
fault-injection hooks for async state transitions |
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.
- yesterday First seen · 205 lines · 104 tokens per session scan A bed201350e50
gopherstack-service-op is a skill published in the GitHub repository BlackbirdWorks/gopherstack (17 stars, last pushed yesterday), licensed MIT. It adds 104 tokens to every session and 2,719 once invoked, about $0.0004 per session on Opus 5.5. 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 2026-11-07.
gopherstack-service-op compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| gopherstack-service-opBlackbirdWorks/gopherstack | Skill | 17 | yesterday | MIT | A | 104 | Claude Code |
| django-migration-psqlprowler-cloud/prowler | Skill | 15k | yesterday | Apache-2.0 | A | 96 | Claude Code |
| prowler-apiprowler-cloud/prowler | Skill | 15k | yesterday | Apache-2.0 | A | 61 | Claude Code |
| django-drfprowler-cloud/prowler | Skill | 15k | yesterday | Apache-2.0 | A | 51 | Claude Code |
| prowler-changelogprowler-cloud/prowler | Skill | 15k | yesterday | Apache-2.0 | A | 92 | Claude Code |
| jsonapiprowler-cloud/prowler | Skill | 15k | yesterday | Apache-2.0 | A | 34 | Claude Code, Codex |
| prowler-mcpprowler-cloud/prowler | Skill | 15k | yesterday | Apache-2.0 | A | 67 | Claude Code |