Borrowing it
Nothing to install: this file belongs to YosefHayim/ebay-mcp. 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/YosefHayim/ebay-mcp/main/.github/copilot-instructions.mdgit clone --depth 1 https://github.com/YosefHayim/ebay-mcpWrote 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/instructions/yosefhayim/ebay-mcp/copilot-instructions)<a href="https://agentmods.dev/instructions/yosefhayim/ebay-mcp/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/yosefhayim/ebay-mcp/copilot-instructions.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 | $0.00451 | $0.00451 |
| Opus 5 | $0.00226 | $0.00226 |
| Sonnet 5 | $0.00090 | $0.00090 |
| Haiku 4.5 | $0.00045 | $0.00045 |
Grade A, and why
ebay-mcp copilot-instructions.md 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 7d 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
GitHub Copilot Instructions
Shared repo guidance lives in AGENTS.md, and full style rules live in CODE-STYLE.md. Use this file only for Copilot-specific reminders.
Core expectations
- This is a TypeScript/Node.js ESM MCP server for eBay APIs. Keep NodeNext
.jsextensions in imports. - Use
@/aliases for imports outside the current folder; use./sibling.jsonly for same-directory imports. - Hand-written source, test, and UI file basenames are camelCase. Generated specs/types and external docs keep upstream names.
- New or migrated exports use named
export const ... = (...) =>functions. Do not add default exports. - Do not hand-edit files under
src/types/; they are generated from eBay OpenAPI specs.
Schema and API patterns
- Tool input schemas are Effect-backed. Import runtime helpers from
@/utils/effectSchema.jsand inference/helper types from@/utils/effectSchemaTypes.js. - Do not import
zoddirectly outside the schema adapter boundary, and do not add compatibility re-export facades. - Fallible API work returns
Effect.Effect<Success, TaggedError, Requirements>. Run Effects at MCP, HTTP, CLI, or test boundaries. - Do not add endpoint/tool
try/catchwhen the work can be represented with Effect. - Endpoint-backed handlers should validate args, run one endpoint Effect, and return the generated eBay DTO without response reshaping.
Documentation and tests
- Endpoint-backed API methods need TSDoc with
@param,@returns, a small@example, and the official eBay@seeURL. - Exported shared utilities document params and returns. Public aliases based on generated response types include
@see. - Prefer focused tests near the changed behavior, then run the relevant validation command before claiming the change is done.
Validation
Use the same gates as AGENTS.md:
npm run typecheck
npm run check:ci
npm test
npm run test:integration
npm run build
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.
- 7d ago First seen · 38 lines · 451 tokens per session scan A c2727899a352
ebay-mcp copilot-instructions.md is an instructions file published in the GitHub repository YosefHayim/ebay-mcp (145 stars, last pushed 22d ago), licensed MIT. It adds 451 tokens to every session, about $0.0023 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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