feat(providers): add copilot_cli semantic-scan provider

.env.example

@@ -4,7 +4,7 @@ ENV=dev                                                         # options: dev|s
 # metadata, and default-model lookups.  Leave unset to default to nv_build.
 # Options: openai | anthropic | anthropic_proxy | bedrock | nv_build |
 #          ollama | azure_openai | openai_compatible | claude_cli |
-#          codex_cli | gemini_cli | opencode_cli
+#          codex_cli | copilot_cli | gemini_cli | opencode_cli
 SKILLSPECTOR_PROVIDER=
 
 # Aggregate deadline for one complete scan workflow. Defaults to 600 seconds;
@@ -67,7 +67,7 @@ AZURE_OPENAI_ENDPOINT=
 SKILLSPECTOR_COMPAT_API_KEY=
 SKILLSPECTOR_COMPAT_BASE_URL=
 
-# claude_cli, codex_cli, gemini_cli, and opencode_cli use their CLI's existing local
+# claude_cli, codex_cli, copilot_cli, gemini_cli, and opencode_cli use their CLI's existing local
 # authentication session and do not need an API key here.
 
 # SkillSpector config

CONTRIBUTING.md

@@ -19,6 +19,34 @@ by the [Developer Certificate of Origin](#developer-certificate-of-origin).
 - New analyzers should include corresponding unit tests and, where applicable,
   test fixtures.
 
+## Provider CLI Validation Expectations
+
+A new or re-verified agent-CLI provider scans untrusted skills, so its
+safety boundary must be enforcement, not documentation. Proposals that
+only describe a gap without closing it will be sent back. Concretely:
+
+- **Exact-version preflight before stdin, on every completion path.**
+  Pin the verified CLI release and re-check it immediately before each
+  inference call — not just in the availability probe, which direct
+  `complete()` calls never touch. A synthetic future-version binary must
+  be rejected before any prompt bytes move (test this).
+- **No hook material, no hooks.** User/plugin lifecycle hooks usually
+  have no argv off-switch. Where home isolation is usable, redirect the
+  CLI's config, plugin, and hook directories to per-invocation temp
+  dirs; where the CLI refuses to run isolated (probed and documented),
+  refuse inference when hook-capable material such as a non-empty
+  `installed-plugins/` tree is present instead. Either way, carry over
+  the minimum auth material and never a whole home directory.
+- **Adversarial fake-host tests proving zero side effects.** A fake
+  binary asserting the exact argv posture plus a marker for any executed
+  tool, hook, or weakened env var; empty marker directory or the test
+  fails.
+- **Synthetic-version gate tests.** A fake binary reporting an
+  unverified version must fail closed, including stdin-never-delivered
+  where the transport allows asserting it.
+- **No silent fallbacks.** Unknown agents, unparseable versions, missing
+  auth, and empty output all raise — never degrade to a weaker policy.
+
 ## Commit Sign-Off
 
 All contributions must include a `Signed-off-by` line in the commit message,

README.md

@@ -241,6 +241,7 @@ inference gateways.
 | `openai_compatible` | `SKILLSPECTOR_COMPAT_API_KEY` + `SKILLSPECTOR_COMPAT_BASE_URL` | Any OpenAI-compatible endpoint | `llama-3.1-70b-versatile` |
 | `claude_cli` | _(none — uses local CLI auth)_ | local `claude` binary | local Claude runtime fallback, or `SKILLSPECTOR_MODEL` |
 | `codex_cli` | _(none — uses local CLI auth)_ | local `codex` binary | local Codex runtime fallback, or `SKILLSPECTOR_MODEL` |
+| `copilot_cli` | _(none — uses local CLI auth)_ | local `copilot` 1.0.86 binary | local Copilot runtime fallback, or `SKILLSPECTOR_MODEL` |
 | `gemini_cli` | _(none — uses local CLI auth)_ | local `gemini` binary | local Gemini runtime fallback, or `SKILLSPECTOR_MODEL` |
 | `opencode_cli` | _(none — uses local CLI auth)_ | local `opencode` 1.18.31 binary | local OpenCode runtime fallback, or `SKILLSPECTOR_MODEL` |
 
@@ -605,7 +606,7 @@ Issues (2)
 
 | Variable | Description | Required |
 |----------|-------------|----------|
-| `SKILLSPECTOR_PROVIDER` | Active LLM provider: `openai`, `anthropic`, `anthropic_proxy`, `bedrock`, `nv_build`, `ollama`, `azure_openai`, `openai_compatible`, `claude_cli`, `codex_cli`, `gemini_cli`, or `opencode_cli`. Hosted providers use bundled `model_registry.yaml` defaults; CLI providers fall back to the local runtime's default model unless `SKILLSPECTOR_MODEL` is set. Defaults to `nv_build`. | Optional |
+| `SKILLSPECTOR_PROVIDER` | Active LLM provider: `openai`, `anthropic`, `anthropic_proxy`, `bedrock`, `nv_build`, `ollama`, `azure_openai`, `openai_compatible`, `claude_cli`, `codex_cli`, `copilot_cli`, `gemini_cli`, or `opencode_cli`. Hosted providers use bundled `model_registry.yaml` defaults; CLI providers fall back to the local runtime's default model unless `SKILLSPECTOR_MODEL` is set. Defaults to `nv_build`. | Optional |
 | `NVIDIA_INFERENCE_KEY` | Credential for the `nv_build` provider (build.nvidia.com). | Required for LLM analysis when `SKILLSPECTOR_PROVIDER=nv_build` |
 | `OPENAI_API_KEY` | Credential for the OpenAI provider (`SKILLSPECTOR_PROVIDER=openai`). Also serves as the tier-2 fallback in the credential waterfall when the active provider returns no credentials. | Required for LLM analysis when `SKILLSPECTOR_PROVIDER=openai` |
 | `OPENAI_BASE_URL` | Override the OpenAI endpoint (e.g. point at Ollama). | Optional |
@@ -631,9 +632,11 @@ Issues (2)
 | `SKILLSPECTOR_MODEL_REGISTRY` | Override the bundled per-provider YAML registry (`src/skillspector/providers/<provider>/model_registry.yaml`) with a custom path. | Optional |
 | `SKILLSPECTOR_LOG_LEVEL` | Log level: `DEBUG`, `INFO`, `WARNING`, `ERROR` (default: `WARNING`). | Optional |
 
-> **CLI providers** (`claude_cli`, `codex_cli`, `gemini_cli`, `opencode_cli`): No API key is needed. Authentication is managed entirely by the agent CLI's own login session. SkillSpector never reads or forwards API keys when these providers are active. The subprocess is run with capabilities restricted, and untrusted skill content is delivered only via stdin.
+> **CLI providers** (`claude_cli`, `codex_cli`, `copilot_cli`, `gemini_cli`, `opencode_cli`): No API key is needed. Authentication is managed entirely by the agent CLI's own login session. SkillSpector never reads or forwards API keys when these providers are active, except `copilot_cli` deliberately preserves only `COPILOT_GITHUB_TOKEN` / `GH_TOKEN` / `GITHUB_TOKEN` (its documented headless auth) while dropping every other `COPILOT_*`. The subprocess is run with capabilities restricted, and untrusted skill content is delivered only via stdin.
 >
 > `opencode_cli` currently fails closed unless the installed OpenCode version is exactly `1.18.31`, the version whose configuration precedence and deny-all semantics are verified by this release.
+>
+> `copilot_cli` currently fails closed unless the installed Copilot CLI version is exactly `1.0.86`, the version whose tool-deny behavior is verified by this release.
 
 ### CLI Options
 

docs/DEVELOPMENT.md

@@ -34,7 +34,7 @@ make install-dev
 
 - **Python**: 3.12+ (see [pyproject.toml](../pyproject.toml)). `make install` and `make install-dev` use **uv** if available (`uv sync` / `uv sync --all-extras`), otherwise **pip** (`pip install -e .` / `pip install -e ".[dev]"`). You must create and activate the virtual environment yourself before running any make target.
 - **Environment**: Optional `.env` in the project root. The LangGraph dev server loads it (see [langgraph.json](../langgraph.json) `"env": ".env"`). Key variables:
-  - **`SKILLSPECTOR_PROVIDER`**: Selects the active LLM provider — `openai`, `anthropic`, `anthropic_proxy`, `bedrock`, `nv_build`, `ollama`, `azure_openai`, `openai_compatible`, `claude_cli`, `codex_cli`, `gemini_cli`, or `opencode_cli`. Defaults to `nv_build` when unset.
+  - **`SKILLSPECTOR_PROVIDER`**: Selects the active LLM provider — `openai`, `anthropic`, `anthropic_proxy`, `bedrock`, `nv_build`, `ollama`, `azure_openai`, `openai_compatible`, `claude_cli`, `codex_cli`, `copilot_cli`, `gemini_cli`, or `opencode_cli`. Defaults to `nv_build` when unset.
   - **Provider credential**: depends on the active provider. Hosted providers use the matching variables in [.env.example](../.env.example); Ollama and CLI providers do not require an API key. See [providers/](../src/skillspector/providers/).
   - **`OPENAI_BASE_URL`**: Override the OpenAI endpoint (e.g. point at Ollama).
   - **`SKILLSPECTOR_MODEL`**: Override default model; see [constants.py](../src/skillspector/constants.py).
@@ -296,7 +296,7 @@ Copy [.env.example](../.env.example) to `.env` in the project root and set value
 
 | Variable | Description | Example |
 |----------|-------------|---------|
-| `SKILLSPECTOR_PROVIDER` | Active LLM provider: `openai` \| `anthropic` \| `anthropic_proxy` \| `bedrock` \| `nv_build` \| `ollama` \| `azure_openai` \| `openai_compatible` \| `claude_cli` \| `codex_cli` \| `gemini_cli` \| `opencode_cli`. Defaults to `nv_build`. | `claude_cli` |
+| `SKILLSPECTOR_PROVIDER` | Active LLM provider: `openai` \| `anthropic` \| `anthropic_proxy` \| `bedrock` \| `nv_build` \| `ollama` \| `azure_openai` \| `openai_compatible` \| `claude_cli` \| `codex_cli` \| `copilot_cli` \| `gemini_cli` \| `opencode_cli`. Defaults to `nv_build`. | `claude_cli` |
 | `NVIDIA_INFERENCE_KEY` | Credential for `nv_build`. | `nvapi-...` |
 | `OPENAI_API_KEY` | Credential for `SKILLSPECTOR_PROVIDER=openai`. Also tier-2 fallback for non-OpenAI providers. | `sk-...` |
 | `OPENAI_BASE_URL` | Override the OpenAI endpoint (e.g. point at Ollama). | `http://localhost:11434/v1` |
@@ -312,7 +312,7 @@ Copy [.env.example](../.env.example) to `.env` in the project root and set value
 | `SKILLSPECTOR_COMPAT_BASE_URL` | OpenAI-compatible endpoint base URL. | `https://api.groq.com/openai/v1` |
 | `SKILLSPECTOR_MODEL` | Override the active provider's bundled default model (see [README.md](../README.md) for per-provider defaults). CLI providers forward it as `--model`. | `gpt-5.2` |
 
-> **CLI providers** (`claude_cli`, `codex_cli`, `gemini_cli`, `opencode_cli`): no credential env var is needed. Authentication is managed by the agent CLI's own session. The subprocess is heavily sandboxed — see [providers/_agent_cli.py](../src/skillspector/providers/_agent_cli.py).
+> **CLI providers** (`claude_cli`, `codex_cli`, `copilot_cli`, `gemini_cli`, `opencode_cli`): no credential env var is needed, except `copilot_cli` deliberately preserves only its three documented token variables (see `_prepare_copilot_env`). Authentication is managed by the agent CLI's own session. The subprocess is heavily sandboxed — see [providers/_agent_cli.py](../src/skillspector/providers/_agent_cli.py).
 
 ### Live provider tests
 
@@ -344,14 +344,15 @@ Base URL env vars are not needed for live provider tests; the tests intentionall
   - `openai_compatible/` — generic compatible endpoint (`SKILLSPECTOR_COMPAT_API_KEY`, `SKILLSPECTOR_COMPAT_BASE_URL`)
   - `claude_cli/` — **local `claude` binary; no API key**. Uses the CLI's own auth session (`claude auth login`). Set `SKILLSPECTOR_PROVIDER=claude_cli`.
   - `codex_cli/` — **local `codex` binary; no API key**. Uses the CLI's own auth session (`codex login`). Set `SKILLSPECTOR_PROVIDER=codex_cli`.
+  - `copilot_cli/` — **local `copilot` 1.0.86 binary; no API key**. Uses the CLI's own auth session (`copilot login`) or token env, stdin prompt transport, deny-all tool posture; fails closed on every other runtime version. Set `SKILLSPECTOR_PROVIDER=copilot_cli`.
   - `gemini_cli/` — **local `gemini` binary; no API key**. Uses the CLI's own auth session. Set `SKILLSPECTOR_PROVIDER=gemini_cli`.
   - `opencode_cli/` — **local `opencode` 1.18.31 binary; no API key**. Uses the CLI's own auth session (`opencode auth login`) and fails closed on every other runtime version because the deny-all policy is verified against that exact release. Set `SKILLSPECTOR_PROVIDER=opencode_cli`.
 
-  CLI providers (`claude_cli`, `codex_cli`, `gemini_cli`, `opencode_cli`) implement the optional `AgentCLICapable` interface (`is_available()` + `complete()`) defined in [providers/base.py](../src/skillspector/providers/base.py). `has_cli_capability(provider)` detects this at runtime. All subprocess calls go through the hardened helper [providers/_agent_cli.py](../src/skillspector/providers/_agent_cli.py) which enforces: no shell (`shell=False`), untrusted content via stdin only, capability stripping (tools disabled / sandboxed), environment scrubbing (no API keys forwarded), per-call timeout, and fail-closed error handling.
+  CLI providers (`claude_cli`, `codex_cli`, `copilot_cli`, `gemini_cli`, `opencode_cli`) implement the optional `AgentCLICapable` interface (`is_available()` + `complete()`) defined in [providers/base.py](../src/skillspector/providers/base.py). `has_cli_capability(provider)` detects this at runtime. All subprocess calls go through the hardened helper [providers/_agent_cli.py](../src/skillspector/providers/_agent_cli.py) which enforces: no shell (`shell=False`), untrusted content via stdin only, capability stripping (tools disabled / sandboxed), environment scrubbing (no API keys forwarded), per-call timeout, and fail-closed error handling.
 
 - **LLM calls** ([llm_utils.py](../src/skillspector/llm_utils.py)): **`get_chat_model()`** and **`chat_completion()`** dispatch based on the active provider:
   - **HTTP providers**: resolve credentials in two tiers — active provider (`NVIDIA_INFERENCE_KEY` / `ANTHROPIC_API_KEY` / `OPENAI_API_KEY` → endpoint) — against any OpenAI-compatible endpoint. `max_tokens` is auto-bound to `get_max_output_tokens(model)` from `model_info`.
-  - **CLI providers** (`claude_cli`, `codex_cli`): `get_chat_model()` returns an `AgentCLIChatModel` adapter backed by `provider.complete()`, so the analyzers' `.invoke()` / `.with_structured_output(schema).invoke()` calls work with no API key (structured output is produced by prompting for JSON, then Pydantic-validating). `chat_completion()` routes through `get_chat_model()` as well. `is_llm_available()` calls `provider.is_available()` instead of credential resolution.
+  - **CLI providers** (`claude_cli`, `codex_cli`, `copilot_cli`, `gemini_cli`, `opencode_cli`): `get_chat_model()` returns an `AgentCLIChatModel` adapter backed by `provider.complete()`, so the analyzers' `.invoke()` / `.with_structured_output(schema).invoke()` calls work with no API key (structured output is produced by prompting for JSON, then Pydantic-validating). `chat_completion()` routes through `get_chat_model()` as well. `is_llm_available()` calls `provider.is_available()` instead of credential resolution.
 - **LLM analyzer base** ([llm_analyzer_base.py](../src/skillspector/nodes/llm_analyzer_base.py)): `LLMAnalyzerBase` provides per-file/per-chunk batching, token-budget-aware chunking, and a run loop for all LLM-based analyzers. `LLMMetaAnalyzer` extends it for filter/enrich (meta_analyzer node). Future semantic analyzers extend `LLMAnalyzerBase` for discovery mode.
 
 ---

src/skillspector/cli.py

@@ -552,8 +552,8 @@ def scan(
         SKILLSPECTOR_PROVIDER  Active LLM provider: openai | anthropic |
                                anthropic_proxy | bedrock | nv_build |
                                nv_inference | ollama | azure_openai |
-                               openai_compatible | claude_cli | codex_cli |
-                               gemini_cli | opencode_cli. Defaults to the NVIDIA path
+                                openai_compatible | claude_cli | codex_cli |
+                                copilot_cli | gemini_cli | opencode_cli. Defaults to the NVIDIA path
                                (nv_inference, falling back to nv_build in
                                OSS builds).
         SKILLSPECTOR_MODEL     Override the active provider's default
@@ -577,7 +577,8 @@ def scan(
 
         ollama uses the local Ollama service. claude_cli, codex_cli,
         gemini_cli, and opencode_cli use their CLI's existing local
-        authentication session.
+        authentication session. copilot_cli uses the CLI login session or
+        one of COPILOT_GITHUB_TOKEN / GH_TOKEN / GITHUB_TOKEN.
     """
     if mcp_registry:
         if recursive or baseline is not None or show_suppressed or yara_rules_dir is not None:

src/skillspector/inference_usage.py

@@ -115,6 +115,7 @@ def provider_name(provider: object) -> str:
         "BedrockProvider": "bedrock",
         "ClaudeCLIProvider": "claude_cli",
         "CodexCLIProvider": "codex_cli",
+        "CopilotCLIProvider": "copilot_cli",
         "GeminiCLIProvider": "gemini_cli",
         "NvBuildProvider": "nv_build",
         "NvInferenceProvider": "nv_inference",

src/skillspector/llm_utils.py

@@ -17,9 +17,9 @@
 
 Credentials are resolved in this order:
     1. The active provider (see :mod:`skillspector.providers`):
-       - CLI providers (``claude_cli``, ``codex_cli``, ``gemini_cli``,
-         ``opencode_cli``): use ``is_available()`` and ``complete()`` — no
-         API key needed.
+       - CLI providers (``claude_cli``, ``codex_cli``, ``copilot_cli``,
+         ``gemini_cli``, ``opencode_cli``): use ``is_available()`` and
+         ``complete()`` — no API key needed.
        - HTTP providers (``anthropic``, ``openai``, ``nv_build``): read their
          respective credential env vars and supply a base URL.
     2. ``OPENAI_API_KEY`` / ``OPENAI_BASE_URL`` (the langchain-openai
@@ -127,7 +127,7 @@ def _resolve_default_chat_model() -> str:
 def is_llm_available() -> tuple[bool, str | None]:
     """Return ``(available, error_message)`` describing LLM availability.
 
-    CLI providers (``claude_cli``, ``codex_cli``, ``gemini_cli``,
+    CLI providers (``claude_cli``, ``codex_cli``, ``copilot_cli``, ``gemini_cli``,
     ``opencode_cli``) are checked through their ``is_available()`` method
     first. Other providers probe the same native chat-model path used by
     :func:`get_chat_model`; unbound HTTP providers keep the
@@ -362,7 +362,7 @@ def get_chat_model(
 ) -> BaseChatModel | AgentCLIChatModel:
     """Return a chat model for the active provider.
 
-    For CLI providers (``claude_cli``, ``codex_cli``, ``gemini_cli``,
+    For CLI providers (``claude_cli``, ``codex_cli``, ``copilot_cli``, ``gemini_cli``,
     ``opencode_cli``) this returns an :class:`AgentCLIChatModel` adapter
     backed by the provider's ``complete()`` subprocess transport — so the
     LLM analyzers (which use ``.invoke()`` and ``.with_structured_output()``)