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/agent-hellboy/mcp-runtime/mcp-spec-compliancenpx skills add Agent-Hellboy/mcp-runtime --skill mcp-spec-compliancegit clone --depth 1 https://github.com/Agent-Hellboy/mcp-runtimeWrote 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/agent-hellboy/mcp-runtime/mcp-spec-compliance)<a href="https://agentmods.dev/skills/agent-hellboy/mcp-runtime/mcp-spec-compliance"><img src="https://agentmods.dev/badge/skills/agent-hellboy/mcp-runtime/mcp-spec-compliance.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 | $0.00148 | $0.04117 |
| Opus 5 | $0.00074 | $0.02058 |
| Sonnet 5 | $0.00030 | $0.00823 |
| Haiku 4.5 | $0.00015 | $0.00412 |
Grade C, and why
mcp-spec-compliance scanned grade C with 2 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Recursive force deletehighDestructive command
rm -rf with a variable or a broad path is one typo away from removing the wrong tree.
trap 'rm -rf "$MCP_SPEC_TMP"' EXIT Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
[ -s "$out" ] || curl -fsSL "$url" -o "$out" How it starts
The opening of the file, as written. The whole thing — 359 lines — stays where its author put it; the contents beside it link to each section on GitHub.
MCP Spec Compliance Audit
Overview
This skill audits MCP Runtime — the proxy/gateway, example servers, agent
adapters, and the CLI probe — against the upstream Model Context Protocol
specification at https://github.com/modelcontextprotocol/modelcontextprotocol.
The spec is versioned (2024-11-05, 2025-03-26, 2025-06-18, draft); the
runtime currently pins 2025-06-18 (see
internal/agentadapter/config.go: DefaultProtocolVersion).
Goals:
- Confirm the runtime correctly implements the spec revision it claims to support — protocol-version negotiation, Streamable HTTP, JSON-RPC 2.0 envelope, tools/resources/prompts/sampling shapes, session semantics, error codes, and capability advertisement.
- Detect drift from the upstream schema (fields renamed, fields removed, required-fields changes) when bumping pinned revision.
- Surface relevant merged SEPs and open SEP PRs that affect runtime behavior.
- Distinguish "spec says X, runtime does X" from "spec says X, runtime does Y" from "spec is silent, runtime does Y by choice."
Regression evidence contract: static schema/code checks are only half of this
skill. For protocol-affecting changes, run live initialize, positive
tools/call, and malformed/unsupported-version negative cases against the Kind
cluster. If upstream fetch or live transport checks cannot run, report the
result blocked for that surface.
Non-goals:
- Auth/grant/session policy enforcement →
qa-e2e-security. - Operator/CLI/setup regressions →
qa-e2e-operations. - Cluster RBAC/PSS hygiene →
k8s-hardening-audit.
Step 1 — Pin the spec revision under audit
SPEC_REPO="${SPEC_REPO:-https://github.com/modelcontextprotocol/modelcontextprotocol}"
SPEC_REV="${SPEC_REV:-$(grep -oE '"20[0-9]{2}-[0-9]{2}-[0-9]{2}"' \
internal/agentadapter/config.go | head -1 | tr -d '"')}"
SPEC_REF="${SPEC_REF:-main}" # upstream branch or tag to fetch from
echo "Auditing runtime against MCP spec rev=$SPEC_REV @ ref=$SPEC_REF"
What ships with it
4 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.
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.
- 5d ago First seen · 359 lines · 148 tokens per session scan C 92ebc3d69b55
mcp-spec-compliance is a skill published in the GitHub repository Agent-Hellboy/mcp-runtime (6 stars, last pushed 3d ago), licensed Apache-2.0. It adds 148 tokens to every session and 4,117 once invoked, about $0.0007 per session on Opus 5. A static security scan graded it C with 2 findings (recursive force delete, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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