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@circleci/mcp-server-circleci

npm / sealed 2026-06-16 / No. 74252e45

Does @circleci/mcp-server-circleci MCP work in Claude Code and Cursor? Throne executed @circleci/mcp-server-circleci mcp in a single-use Firecracker microVM and replayed both recorded client behaviours. Compatibility verdict: fit. Is @circleci/mcp-server-circleci mcp safe? Static security scan: 1 finding(s) to review under security ruleset v1. The full per-step results, security findings, scan date, and evidence hash are below.

> throne registry @circleci/mcp-server-circleci sealed
receiptsealed evidence
scan id
74252e4521cd43b480d1261297568212
target
@circleci/mcp-server-circleci
sealed at
2026-06-16 17:25:06Z
evidence hash
sha256:61df7d5dfa4f9b1488a1700cd5c3007da95c6b710f70e9690fde5e6fc09e218f
01connectPASS2.5s

initialize ok: server mcp-server-circleci 1.0.0, negotiated protocolVersion 2025-11-25, capabilities ['resources', 'tools']

02discoverPASS18ms

supported: tools/list (17 tools); method not found (tolerated): resources/list, prompts/list

03validate_schemasPASS14ms

all 17 tool inputSchemas are valid JSON Schema

04smoke_test_toolsPASS723ms

called 10 of 10 tools (cap 10, strategy=serial): 0 ok, 10 returned tool-level errors (expected for synthesized args)

05error_handlingPASS8.3s

structured error responses, connection survived, wrong_type_args: get_build_failure_logs:accepted (returned result); find_flaky_tests:accepted (returned result); get_latest_pipeline_status:accepted (returned result); get_job_test_results:accepted (returned result); config_helper:accepted (returned result); unknown_method: error(-32601); invalid_id: no response (silent), connection alive; oversized_input: accepted (returned result); recovery: accepted (returned result); cancellation: accepted (returned result); old_version: accepted old version 2024-10-07, negotiated 2024-10-07, server may have stale protocol handling

06streamingNOT_APPLICABLE0ms

no streaming-capable tool declared by this server

07resource_lifecycleNOT_APPLICABLE2ms

resources capability not declared

08concurrent_callsWARN3ms

ladder 1 overlapping get_build_failure_logs calls: max_observed_stable_concurrency=1; all ids answered exactly once, but every call returned an error (tool-level isError result), the tool may need runtime dependencies this sandbox does not provide

09reconnectPASS3.4s

transport closed and relaunched; re-handshake ok (protocolVersion 2025-11-25, first session was 2025-11-25)

01connectPASS4.9s

initialize ok: server mcp-server-circleci 1.0.0, negotiated protocolVersion 2025-11-25, capabilities ['resources', 'tools'] [request_strategy=pipelined, connection_count=2, second connection established]

02discoverPASS27ms

supported: tools/list (17 tools); method not found (tolerated): resources/list, prompts/list; notes: connection 2 confirms 17 tools

03validate_schemasPASS14ms

all 17 tool inputSchemas are valid JSON Schema

04smoke_test_toolsPASS471ms

called 10 of 10 tools (cap 10, strategy=pipelined): 0 ok, 10 returned tool-level errors (expected for synthesized args)

05error_handlingPASS8.5s

structured error responses, connection survived, wrong_type_args: get_build_failure_logs:accepted (returned result); find_flaky_tests:accepted (returned result); get_latest_pipeline_status:accepted (returned result); get_job_test_results:accepted (returned result); config_helper:accepted (returned result); unknown_method: error(-32601); invalid_id: no response (silent), connection alive; oversized_input: accepted (returned result); recovery: accepted (returned result); cancellation: accepted (returned result); old_version: accepted old version 2024-10-07, negotiated 2024-10-07, server may have stale protocol handling

06streamingNOT_APPLICABLE0ms

no streaming-capable tool declared by this server

07resource_lifecycleNOT_APPLICABLE2ms

resources capability not declared

08concurrent_callsWARN8ms

ladder 1/2/4/6 overlapping get_build_failure_logs calls: max_observed_stable_concurrency=6; all ids answered exactly once, but every call returned an error (tool-level isError result), the tool may need runtime dependencies this sandbox does not provide

09reconnectPASS5.0s

transport closed and relaunched; re-handshake ok (protocolVersion 2025-11-25, first session was 2025-11-25)

chatgpt desktop calibratingemulation profile pending real-traffic captureCOMING SOON
SECURITY: REVIEW / 1 finding(s) / review recommended
LOWTHR-NET-05 / Hardcoded outbound endpoints

8 non-local endpoint host(s) referenced in code, verify each is expected for this server's purpose: api (package/dist/clients/circleci/index.js:15), app (package/dist/clients/circleci/index.js:21), app.circleci.com (package/dist/lib/project-detection/index.js:33), circleci.atlassian.net (package/dist/lib/project-detection/vcsTool.js:3), circleci.com (package/dist/clients/circleci/index.js:13), circlet.ai (package/dist/clients/circlet/index.js:11), gist.githubusercontent.com (package/dist/tools/runEvaluationTests/handler.js:128), runner.circleci.com (package/dist/lib/telemetry/config.js:5)

package/dist/clients/circleci/index.js:13
VERDICT: FIT14 of 18 steps exercised across 2 clientsSANDBOXED RUN, submitted server executed in a disposable microVM, compatibility: 0 fail / 2 warn (14 of 18 steps exercised across 2 clients) / security: review, 1 finding(s), 0 highsealed by THRONE / No. 74252e45 / 2026-06-16
scopeattestation tuple
target
@circleci/mcp-server-circleci npm
engine
sandboxed
claude code
calibration: partial recorded=9,spec=0,assumed=9
cursor
calibration: partial recorded=11,spec=0,assumed=7
chatgpt desktop
calibration: unavailable recorded=0,spec=2,assumed=16
steps exercised
14 of 18
test suite
v1.0.0
security ruleset
v1.0.0
sealed at
2026-06-16 17:25:06Z
evidence hash
sha256:61df7d5dfa4f9b1488a1700cd5c3007da95c6b710f70e9690fde5e6fc09e218f
valid until
2026-09-14
THRONE: FITwear the crown

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[![THRONE: FIT](https://api.usethrone.dev/api/badge/%40circleci%2Fmcp-server-circleci)](https://usethrone.dev/server/circleci-mcp-server-circleci)
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