Enables AI agents to securely control a user's existing signed-in Chrome browser through isolated tab groups, with strict per-session ownership and no cookie or token exposure.
Emerging. No concerning findings. Grades remain capped until the project builds reputation through adoption. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.
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RobertJLora
Source: Glama
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UMBRA_ALLOW_EXTENSION_RELOADUMBRA_AUTH_CHECK_URLUMBRA_AUTH_EXPECT_HOSTUMBRA_AUTH_REJECT_URL_PATTERNUMBRA_BENCH_KEEP_TABS_OPENUMBRA_BENCH_LARGE_KBUMBRA_BENCH_PORT_ENDUMBRA_BENCH_PORT_STARTUMBRA_BENCH_RUNSUMBRA_BENCH_TABSUMBRA_BENCH_TIMEOUT_MSUMBRA_BIND_TIMEOUT_MSUMBRA_BROKER_BINUMBRA_BROKER_CHECK_TIMEOUT_MSUMBRA_BROKER_CONNECT_TIMEOUT_MSUMBRA_BROKER_MODEUMBRA_BROKER_SOCKETUMBRA_BROKER_START_TIMEOUT_MSUMBRA_CHROME_PREFSUMBRA_CHROME_USER_DATA_DIRUMBRA_CLOSE_ON_SHUTDOWNUMBRA_EXTENSION_DIRUMBRA_EXTENSION_IDUMBRA_IDLE_EMPTY_SESSION_MIN_AGE_MSUMBRA_IDLE_EMPTY_SESSION_TTL_MSUMBRA_KEEP_TABS_OPENUMBRA_MCP_SHIM_MODEUMBRA_PARENT_WATCH_MSUMBRA_PORT_ENDUMBRA_PORT_STARTUMBRA_PUBLIC_URLUMBRA_REQUEST_TIMEOUT_MSUMBRA_REQUIRED_PORT_AUMBRA_REQUIRED_PORT_BUMBRA_RUST_SMOKE_PORT_ENDUMBRA_RUST_SMOKE_PORT_STARTUMBRA_SCHEMA_WARNUMBRA_SESSION_IDUMBRA_SHARED_KEYUMBRA_SHARED_KEY_FILEUMBRA_SHUTDOWN_CLOSE_TIMEOUT_MSUMBRA_SMOKE_TIMEOUT_MSUMBRA_STRESS_KEEP_OPEN_MSUMBRA_STRESS_PORT_STARTUMBRA_STRESS_SESSIONSUMBRA_STRESS_TABSUMBRA_SUITE_PORT_ENDUMBRA_SUITE_PORT_STARTUMBRA_SUITE_TIMEOUT_MSTool annotations
No tools have read-only/destructive annotations
Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.
All four hints declared on every tool
47/47 tools missing one or more hints — browser_navigate (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); browser_navigate_back (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); browser_navigate_forward (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +44 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.
For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.
README present
No README found
Add a README.md describing the server and its tools.
License file
No license file
Add a LICENSE file (MIT, Apache-2.0, etc.).
Tests exist
No test files found
Add tests that exercise each declared tool.
Secrets not written to files
1 secret value written to files
Avoid persisting secrets to disk. Keep them in memory or your secret manager.
Secrets not logged
1 secret value sent to console.log
Redact or omit secret values from log output.
Domain consistency
npm scope @umbra-mcp doesn't match GitHub owner robertjlora
Use the same org name across GitHub, npm, and your homepage so users can verify the publisher.
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[](https://m8ven.ai/mcp/robertjlora-umbra-1e3731)?variant=verified to the badge URL.Vetting this one by hand? Tool Check is an MCP that scores other MCPs. Add it once and ask Claude, ChatGPT, or any MCP client to grade a server, surface CVEs, check the publisher, and suggest safer alternatives — before you install.
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