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.
git clone --depth 1 https://github.com/prest/prest-mcp-adapterWrote 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/rules/prest/prest-mcp-adapter/agentic-loop)<a href="https://agentmods.dev/rules/prest/prest-mcp-adapter/agentic-loop"><img src="https://agentmods.dev/badge/rules/prest/prest-mcp-adapter/agentic-loop/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/rules/prest/prest-mcp-adapter/agentic-loop"><img src="https://agentmods.dev/badge/rules/prest/prest-mcp-adapter/agentic-loop.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 | $0.00508 | $0.00508 |
| Opus 5.5 | $0.00203 | $0.00203 |
| Sonnet 5.5 | $0.00102 | $0.00102 |
| Haiku 4.5 | $0.00051 | $0.00051 |
Grade A, and why
agentic-loop 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 1mo 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.
What it actually says
prest-mcp-adapter Agentic Development Loop
Follow this loop on every development task. For conventions, see @.github/copilot-instructions.md.
The Loop
Understand → Locate → Plan → Implement → Validate → Self-review → (iterate)
1. Understand
- Restate the goal: this repo is a dumb stdio→HTTP bridge to pREST
/_mcp. - Check
go.modfor the Go version before choosing APIs. - Do not add schema/SQL/tool business logic unless explicitly requested.
2. Locate
| Path | Role |
|---|---|
cmd/prest-mcp/ |
Entrypoint |
internal/config/ |
Env loading |
internal/transport/ |
Stdio NDJSON + HTTP POST |
internal/proxy/ |
Forward + JSON-RPC error synthesis |
internal/logging/ |
slog → stderr |
3. Plan
- Smallest diff that solves the task.
- Keep stdout protocol-only; logs on stderr.
- Fail closed on missing/invalid
PREST_MCP_URL.
4. Implement
| Area | Rule |
|---|---|
| Scope | Tiny transport bridge; no pREST domain logic |
| State | Inject deps via constructors; no package-level mutable app state |
| Errors | Wrap with %w; use slog on stderr |
| Formatting | gofmt |
5. Validate
go build ./...
go vet ./...
gofmt -l .
make test # includes overall coverage >= 80%
6. Self-review
- Diff is minimal
- No logs on stdout
- Config fail-closed for required URL
- New behavior has unit tests (httptest / buffers)
- Overall statement coverage stays ≥80%
- Validation commands passed
Definition of Done
go build ./...andgo vet ./...passmake testpasses (-race -timeout 30s+ overall coverage ≥80%)- Self-review checklist is green
- No scope creep
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.
- 1mo ago First seen · 71 lines · 508 tokens per session scan A 79cd2b8126e8
agentic-loop is a cursor rule published in the GitHub repository prest/prest-mcp-adapter (0 stars, last pushed 3mo ago), licensed MIT. It adds 508 tokens to every session, about $0.0020 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 2026-08-31.
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