Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add MadAppGang/magus/plugin install bunjsWrote 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/madappgang/magus/http-service)<a href="https://agentmods.dev/skills/madappgang/magus/http-service"><img src="https://agentmods.dev/badge/skills/madappgang/magus/http-service.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 | $0.00045 | $0.02028 |
| Opus 5 | $0.00023 | $0.01014 |
| Sonnet 5 | $0.00009 | $0.00406 |
| Haiku 4.5 | $0.00005 | $0.00203 |
Grade A, and why
http-service 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 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.
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 — 160 lines — stays where its author put it; the contents beside it link to each section on GitHub.
HTTP services on Bun
Bun.serve gives you a native radix router with typed path params and no framework. What it does
not give you is middleware, a 405, a request id, an access log, or any response convention —
and the usual reaction is to abandon routes for hand-rolled dispatch inside fetch(), throwing
away the router and the typed params along with it.
This skill keeps routes and wraps handlers instead.
Four measured routing behaviours that will bite you
All MEASURED against a live server on Bun 1.3.10:
| What you write | What actually happens |
|---|---|
"/things": { GET, POST }, request is PUT |
No 405. Falls through to fetch() → usually a 404 |
"/files/*": handler |
Route matches, but req.params is {} — the wildcard captures nothing |
server.reload({ routes: { "/health": … } }) |
Replaces the entire route table. Every route missing from the payload starts 404ing |
"/health": new Response("ok") |
A static Response value is reused across requests, not consumed |
The 405 one matters semantically: 404 tells a client the resource does not exist, 405 tells it the
resource exists and the verb is wrong. allowMethods() in the shipped middleware produces a real
405 with the Allow header RFC 9110 requires.
To read a wildcard's captured path, use new URL(req.url).pathname — req.params will not have it.
Copy the middleware in
38 tests ship with this code and pass (bun test, tsc --noEmit clean, Bun 1.3.10).
SKILL="${CLAUDE_PLUGIN_ROOT:+$CLAUDE_PLUGIN_ROOT/skills/http-service}"; SKILL="${SKILL:-PASTE_THE_DIR_THIS_SKILL_MD_WAS_READ_FROM}" # that var is UNSET in a Bash tool (MEASURED) — so paste it. `:?` would ABORT the block and copy nothing
mkdir -p src; if [ -d "$SKILL/assets" ]; then cp -r "$SKILL/assets/http" src/http # middleware + respond + 2 test files
else echo "SKILL is still the placeholder — paste the real dir above and re-run"; fi
| Export | Purpose |
|---|---|
chain(...mw) |
compose middleware left-to-right, matching reading order |
withRequestId() |
assigns/propagates a request id via AsyncLocalStorage |
accessLog(write) |
one structured line per request, including failures |
allowMethods(...) |
the real 405 Bun does not give you |
timeout(ms) |
wall-clock cap on a handler → 504 |
currentRequestId() |
read the ambient id anywhere, no parameter threading |
ok/created/noContent/accepted/seeOther/page |
one response envelope, consistently |
withETag(req, body) |
conditional GET → 304 |
streamJsonArray(source) |
stream a large collection without buffering |
What ships with it
10 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.
- assets/http/middleware.test.ts 7.8 KB runs code
- assets/http/middleware.ts 6.3 KB runs code
- assets/http/respond.test.ts 5.7 KB runs code
- assets/http/respond.ts 5.5 KB runs code
- bun.lock 1.2 KB
- package.json 359 B
- references/api-design.md 6.3 KB
- references/routing-and-serve.md 5.2 KB
- references/websockets-and-streaming.md 5.8 KB
- tsconfig.json 324 B
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 · 160 lines · 45 tokens per session scan A 9d26769c2234
http-service is a skill published in the GitHub repository MadAppGang/magus (9 stars, last pushed today), licensed MIT. It adds 45 tokens to every session and 2,028 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 2026-08-31.
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