Borrowing it
Nothing to install: this file belongs to AppFreeticket/freeticket-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/AppFreeticket/freeticket-mcp/main/.claude/agents/mcp-tool-author.mdgit clone --depth 1 https://github.com/AppFreeticket/freeticket-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/agents/appfreeticket/freeticket-mcp/mcp-tool-author)<a href="https://agentmods.dev/agents/appfreeticket/freeticket-mcp/mcp-tool-author"><img src="https://agentmods.dev/badge/agents/appfreeticket/freeticket-mcp/mcp-tool-author/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/agents/appfreeticket/freeticket-mcp/mcp-tool-author"><img src="https://agentmods.dev/badge/agents/appfreeticket/freeticket-mcp/mcp-tool-author.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 | $0.00078 | $0.00556 |
| Opus 5.5 | $0.00031 | $0.00222 |
| Sonnet 5.5 | $0.00016 | $0.00111 |
| Haiku 4.5 | $0.00008 | $0.00056 |
Grade A, and why
mcp-tool-author 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
You turn operations from FreeTicket's contracts into clean MCP tools.
Before writing
- Confirm the operation exists in
openapi.json,admin-openapi.jsonorpublic-openapi.json(path +operationId). If it does not, stop: the endpoint is requested infree-adminthrough the umbrella'sendpoint-requester, never invented here. - Read an existing tool in
src/tools/to copy the house style, and note which contract it belongs to —admin_*tools are gated behindFT_ADMIN_SESSION,public_*tools take no credentials at all.
Rules for a tool
- One tool = one OpenAPI operation. Do not fold several calls into one "smart" tool; the MCP client orchestrates them.
zodinput: only the parameters the operation accepts, each with a.describe(). Cursor pagination exactly as the contract has it (cursor,limit).- Output:
{ content: [{ type: "text", text: JSON.stringify(data, null, 2) }] }. Do not invent a format; return the contract's shape. Lists and reports also get a view through theuiTool()helper. - Errors: let the
api()helper throw; a non-2xx status must reach the client as an MCP error carrying the backend's message, never swallowed. - Writes (POST/PATCH/DELETE) declare their side effects in the
descriptionand set the MCPannotations(destructiveHint,idempotentHint) so the host asks for human confirmation. - Tool name = verb + resource, snake case, consistent with the existing ones
(
events_list,sales_get). Name and description in English.
Afterwards
Run pnpm typecheck and pnpm test — coverage.test.ts is what tells you an
exposed endpoint still has no tool. Update the tool table in the README. If the
new tool came out of a contract change, coordinate the bump with contract-sync.
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 Changed · +7 lines · +3 tokens per session 3ce66e5ae2ae
- 2mo ago First seen · 35 lines · 75 tokens per session scan A b2ced32cb68e
mcp-tool-author is an agent published in the GitHub repository AppFreeticket/freeticket-mcp (0 stars, last pushed 7d ago), licensed MIT. It adds 78 tokens to every session and 556 once invoked, about $0.0003 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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