Add Mcp tool poisoning sample (Demonstration purposes only) - #3387
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senthuran16
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September 7, 2026 06:44
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe PR adds an MCP tool-poisoning demo with WireMock fixtures, direct and gateway passes, secure request handling, gateway configuration guidance, cleanup scripts, and CI validation. ChangesMCP Tool-Poisoning Demo
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to This change adds an MCP tool-poisoning demonstration, but its automated smoke test is not runnable as configured, leaving the demo’s setup and execution behavior without the intended CI validation. Resolve the workflow location and command paths before merging. Sequence Diagram(s)sequenceDiagram
participant Demo as demo.sh
participant Evil as WireMock MCP server
participant Proxy as WSO2 MCP Proxy
participant ACL as MCP Access Control
Demo->>Evil: initialize and tools/list
Evil-->>Demo: benign and poisoned tools
Demo->>Proxy: initialize and tools/list
Proxy->>ACL: evaluate returned tools
ACL-->>Proxy: allow configured tools
Proxy-->>Demo: filtered tool list
🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
Full details: Description checkExplanation The description provides a purpose and safety disclaimer, but it omits the required Goals, Approach, User stories, Documentation, Automation tests, Security checks, Samples, Related PRs, and Test environment sections. Resolution Complete the repository template. Add details for each required section, or explicitly state “N/A” with a brief explanation where a section does not apply. Include test coverage, security checks, sample details, related PRs, and the tested environment. Full details: Docstring CoverageExplanation Docstring coverage is 7.69% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 13 functions across 4 files. (2 skipped: 2 unsupported.)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Actionable comments posted: 10
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Inline comments:
In `@samples/mcp-tool-poisoning-demo/.env.example`:
- Around line 7-8: Update the MCP Proxy configuration comment near the Invoke
URL to state that the MCP Access Control policy must be attached and deployed,
removing the Semantic Tool Filtering requirement.
In `@samples/mcp-tool-poisoning-demo/.github/workflows/ci.yml`:
- Line 15: Update the workflow’s command execution context so the chmod step and
subsequent setup, demo, and teardown script commands run from
samples/mcp-tool-poisoning-demo after checkout. Prefer setting
defaults.run.working-directory for the job rather than individually prefixing
each script path.
- Line 1: Move the CI workflow containing the top-level name: CI declaration
from the sample-specific .github/workflows directory to the repository-root
.github/workflows/ci.yml location, preserving its existing triggers and jobs so
it runs for pushes and pull requests.
In `@samples/mcp-tool-poisoning-demo/demo.sh`:
- Line 143: Update the success condition in the mcp_request handling flow before
the poisoned check so .result.tools is validated as an array; only report policy
success when the MCP response contains a valid tool list and poisoned equals
zero, while preserving failure handling for invalid responses and JSON-RPC
errors.
- Line 164: Update the all-mode flow around run_pass2 so it preserves and
returns the meaningful exit status for unconfigured gateways and poisoned-tool
pass-through, rather than converting every failure to success; retain any
intended handling for non-fatal outcomes while ensuring callers of demo.sh all
can detect the relevant status.
- Around line 38-42: Update list_tools to send the MCP notifications/initialized
notification through mcp_request after the successful INIT_BODY request and
before LIST_BODY, preserving the existing failure handling and token usage for
both direct and gateway flows.
In `@samples/mcp-tool-poisoning-demo/README.md`:
- Line 18: Update the tools-list.json README link to use the repository-relative
evil-server/mappings/tools-list.json path instead of the absolute
http://evil-server URL, preserving the surrounding explanation.
In `@samples/mcp-tool-poisoning-demo/scripts/lib.sh`:
- Line 37: Update the curl invocation that builds the headers array so
GATEWAY_API_KEY is not exposed in process arguments; pass the Authorization
header through curl’s protected stdin configuration or a 0600 temporary file,
removing any temporary file after the request completes.
- Line 39: Update the curl invocation in the HTTP helper to reject non-2xx
responses before returning the body, and enforce the advertised response
contract by rejecting text/event-stream responses unless the helper parses their
SSE data into JSON first. Preserve returning valid JSON bodies for successful
responses consumed by list_tools and demo.sh.
In `@samples/mcp-tool-poisoning-demo/setup.sh`:
- Line 22: Replace the container-existence pipeline in
samples/mcp-tool-poisoning-demo/setup.sh at line 22 with a Docker-native docker
container inspect "${CONTAINER_NAME}" check, redirecting output and errors to
/dev/null. Apply the same change to the corresponding check in
samples/mcp-tool-poisoning-demo/teardown.sh at line 12, preserving the existing
conditional behavior.
After applying the fix, consider running `coderabbit review --agent` for local
review. Visit https://docs.coderabbit.ai/cli.
🪄 Autofix
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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📒 Files selected for processing (11)
samples/mcp-tool-poisoning-demo/.env.examplesamples/mcp-tool-poisoning-demo/.github/workflows/ci.ymlsamples/mcp-tool-poisoning-demo/.gitignoresamples/mcp-tool-poisoning-demo/README.mdsamples/mcp-tool-poisoning-demo/demo.shsamples/mcp-tool-poisoning-demo/evil-server/mappings/initialize.jsonsamples/mcp-tool-poisoning-demo/evil-server/mappings/notifications-initialized.jsonsamples/mcp-tool-poisoning-demo/evil-server/mappings/tools-list.jsonsamples/mcp-tool-poisoning-demo/scripts/lib.shsamples/mcp-tool-poisoning-demo/setup.shsamples/mcp-tool-poisoning-demo/teardown.sh
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Arshardh
approved these changes
Sep 8, 2026
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