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.
npx agentmods add skills/codeinfinity1/stram/mcp-server-buildernpx skills add CodeInfinity1/Stram --skill mcp-server-buildergit clone --depth 1 https://github.com/CodeInfinity1/StramWhat 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 | $0.00033 | $0.00405 |
| Opus 5 | $0.00016 | $0.00202 |
| Sonnet 5 | $0.00007 | $0.00081 |
| Haiku 4.5 | $0.00003 | $0.00040 |
Grade A, and why
mcp-server-builder 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 2d 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
MCP Server Builder
Purpose
Build or plan Model Context Protocol servers as explicit tool surfaces. This skill emphasizes schema clarity, auth, least privilege, and verification.
When To Use
Use when the user asks to build an MCP server, expose tools, wrap an API, add OAuth/auth, deploy a remote MCP service, or review MCP server code.
Inputs And Evidence
- Desired tools/resources, auth model, host/runtime, deployment target, and client integration needs.
- Existing code, API docs, schemas, and tests.
Tool Map
read_filesearch_workspacewrite_noterun_shell_commandtool_searchagent-api-integration
Workflow
- Define tool/resource contracts and user-visible capability boundaries.
- Choose runtime and auth model.
- Implement small typed tools with clear schemas and errors.
- Add tests for schema validation, auth, and failure cases.
- Document setup and secrets.
- Verify with local or deployed smoke tests.
Native Implementation Boundaries
- Implement MCP code inside the user's project or Stram-owned adapters.
- Do not import Anthropic MCP builder skill code as implementation.
- Do not expose broad filesystem/network access without explicit policy.
Safety And Approval
- Auth, secrets, and external APIs require careful setup.
- Tools that mutate external state need approval modes.
- Avoid logging tokens or private payloads.
Verification
- Validate tool schemas.
- Run local tests and an MCP client smoke where feasible.
- Confirm auth failure behavior.
Failure Modes
- Tools with vague inputs.
- No error contract.
- Overpowered server access.
References
- Shortlist item:
mcp-server-builder. - Upstream inspiration: Anthropic MCP builder reference only.
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.
- 2d ago First seen · 67 lines · 33 tokens per session scan A 5d3fe3566e4d
mcp-server-builder is a skill published in the GitHub repository CodeInfinity1/Stram (10 stars, last pushed 22d ago), licensed MIT. It adds 33 tokens to every session and 405 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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