{ "$schema": "https://raw.githubusercontent.com/yaniv-golan/cowork-harness/main/schema/cassette.v12.json", "generator": "cowork-harness", "cassetteVersion": 12, "scenario": { "name": "hostloop-computer-links", "baseline": "latest", "session": "../sessions/hostloop-computer-links.yaml", "fidelity": "hostloop", "execution": "local", "lane": "local", "prompt": "Write a file at outputs/report.md whose contents are exactly the line: hostloop smoke.\nThen, in your reply, share that file with me as a computer:// link so I can open it.\n", "answers": [ { "when_tool": "Write", "decide": "allow" }, { "when_tool": "Bash", "decide": "deny" } ], "expect_denied": [], "assert": [ { "result": "success" }, { "file_exists": "outputs/report.md" }, { "transcript_contains": "computer://" }, { "computer_links_resolve": true } ], "skills": [], "requires_capabilities": [] }, "events": [ "{\"type\":\"control_request\",\"request_id\":\"79c0ea9b-f2cc-4673-9f67-708874e39070\",\"request\":{\"subtype\":\"mcp_message\",\"server_name\":\"workspace\",\"message\":{\"method\":\"initialize\",\"params\":{\"protocolVersion\":\"2025-11-25\",\"capabilities\":{},\"clientInfo\":{\"name\":\"claude-code\",\"title\":\"Claude Code\",\"version\":\"2.1.246\",\"description\":\"Anthropic's agentic coding tool\",\"websiteUrl\":\"https://claude.com/claude-code\"}},\"jsonrpc\":\"2.0\",\"id\":0}}}", "{\"type\":\"control_request\",\"request_id\":\"eb52cf09-fe60-4811-b694-80497de867e8\",\"request\":{\"subtype\":\"mcp_message\",\"server_name\":\"cowork\",\"message\":{\"method\":\"initialize\",\"params\":{\"protocolVersion\":\"2025-11-25\",\"capabilities\":{},\"clientInfo\":{\"name\":\"claude-code\",\"title\":\"Claude Code\",\"version\":\"2.1.246\",\"description\":\"Anthropic's agentic coding tool\",\"websiteUrl\":\"https://claude.com/claude-code\"}},\"jsonrpc\":\"2.0\",\"id\":0}}}", "{\"type\":\"control_request\",\"request_id\":\"17db2cbd-b0b7-4d03-91b7-6bb872413e0e\",\"request\":{\"subtype\":\"mcp_message\",\"server_name\":\"skills\",\"message\":{\"method\":\"initialize\",\"params\":{\"protocolVersion\":\"2025-11-25\",\"capabilities\":{},\"clientInfo\":{\"name\":\"claude-code\",\"title\":\"Claude Code\",\"version\":\"2.1.246\",\"description\":\"Anthropic's agentic coding tool\",\"websiteUrl\":\"https://claude.com/claude-code\"}},\"jsonrpc\":\"2.0\",\"id\":0}}}", "{\"type\":\"control_request\",\"request_id\":\"2157880a-6c7f-40af-ae36-818655e090eb\",\"request\":{\"subtype\":\"mcp_message\",\"server_name\":\"plugins\",\"message\":{\"method\":\"initialize\",\"params\":{\"protocolVersion\":\"2025-11-25\",\"capabilities\":{},\"clientInfo\":{\"name\":\"claude-code\",\"title\":\"Claude Code\",\"version\":\"2.1.246\",\"description\":\"Anthropic's agentic coding tool\",\"websiteUrl\":\"https://claude.com/claude-code\"}},\"jsonrpc\":\"2.0\",\"id\":0}}}", "{\"type\":\"control_response\",\"response\":{\"subtype\":\"success\",\"request_id\":\"init-1\",\"response\":{\"commands\":[{\"name\":\"deep-research\",\"description\":\"Deep research harness — fan-out web searches, fetch sources, adversarially verify claims, synthesize a cited report. 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"{\"type\":\"control_request\",\"request_id\":\"716c05ff-5352-4a59-94b3-5688b38f622e\",\"request\":{\"subtype\":\"hook_callback\",\"callback_id\":\"hostloop-path-gate\",\"input\":{\"session_id\":\"41bfa4d7-ade7-48c6-9660-26bc58254baa\",\"transcript_path\":\"[REDACTED:local-path:b509c9868d13]\",\"cwd\":\"[REDACTED:local-path:d2b464b90d0a]/mnt/outputs\",\"prompt_id\":\"95e7fe53-2730-40e2-8320-71dc44212286\",\"permission_mode\":\"default\",\"effort\":{\"level\":\"high\"},\"hook_event_name\":\"PreToolUse\",\"tool_name\":\"Write\",\"tool_input\":{\"file_path\":\"[REDACTED:local-path:d2b464b90d0a]/mnt/outputs/report.md\",\"content\":\"hostloop smoke.\\n\"},\"tool_use_id\":\"toolu_01MSgRxTaGPi9fCZAVPY5oAD\"},\"tool_use_id\":\"toolu_01MSgRxTaGPi9fCZAVPY5oAD\"}}", 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back)\"}]},\"parent_tool_use_id\":null,\"session_id\":\"41bfa4d7-ade7-48c6-9660-26bc58254baa\",\"uuid\":\"a71fed7b-fffe-4d96-a86b-cffc5604f6ad\",\"timestamp\":\"2026-08-26T07:14:21.079Z\",\"tool_use_result\":{\"type\":\"create\",\"filePath\":\"[REDACTED:local-path:d2b464b90d0a]/mnt/outputs/report.md\",\"content\":\"hostloop smoke.\\n\",\"structuredPatch\":[],\"originalFile\":null,\"userModified\":false}}", "{\"type\":\"assistant\",\"message\":{\"model\":\"claude-opus-4-8\",\"id\":\"msg_011CeQwtGmEKruxTUFLRDe5v\",\"type\":\"message\",\"role\":\"assistant\",\"content\":[{\"type\":\"text\",\"text\":\"Done. [View your report](computer://[REDACTED:local-path:d2b464b90d0a]/mnt/outputs/report.md)\"}],\"stop_reason\":null,\"stop_sequence\":null,\"stop_details\":null,\"usage\":{\"input_tokens\":2,\"cache_creation_input_tokens\":253,\"cache_read_input_tokens\":19275,\"cache_creation\":{\"ephemeral_5m_input_tokens\":0,\"ephemeral_1h_input_tokens\":253},\"output_tokens\":2,\"service_tier\":\"standard\",\"inference_geo\":\"not_available\"},\"diagnostics\":null,\"context_management\":null},\"parent_tool_use_id\":null,\"session_id\":\"41bfa4d7-ade7-48c6-9660-26bc58254baa\",\"uuid\":\"5d1134ab-f31c-496b-8c7e-35a11bce4411\",\"timestamp\":\"2026-08-26T07:14:23.424Z\",\"request_id\":\"req_011CeQwtFxN3HSY6fGDfbCpx\"}", "{\"is_error\":false,\"duration_api_ms\":6051,\"num_turns\":2,\"stop_reason\":\"end_turn\",\"session_id\":\"41bfa4d7-ade7-48c6-9660-26bc58254baa\",\"total_cost_usd\":0.21028750000000002,\"usage\":{\"input_tokens\":4,\"cache_creation_input_tokens\":19528,\"cache_read_input_tokens\":19275,\"output_tokens\":214,\"output_tokens_details\":{\"thinking_tokens\":0},\"server_tool_use\":{\"web_search_requests\":0,\"web_fetch_requests\":0},\"service_tier\":\"standard\",\"cache_creation\":{\"ephemeral_1h_input_tokens\":19528,\"ephemeral_5m_input_tokens\":0},\"inference_geo\":\"not_available\",\"iterations\":[{\"input_tokens\":2,\"output_tokens\":71,\"cache_read_input_tokens\":19275,\"cache_creation_input_tokens\":253,\"cache_creation\":{\"ephemeral_5m_input_tokens\":0,\"ephemeral_1h_input_tokens\":253},\"type\":\"message\"}],\"speed\":\"standard\"},\"modelUsage\":{\"claude-opus-4-8\":{\"inputTokens\":4,\"outputTokens\":214,\"cacheReadInputTokens\":19275,\"cacheCreationInputTokens\":19528,\"webSearchRequests\":0,\"costUSD\":0.21028750000000002,\"contextWindow\":1000000,\"maxOutputTokens\":64000,\"canonicalModel\":\"claude-opus-4-8\",\"provider\":\"firstParty\",\"costBasis\":\"list\"}},\"permission_denials\":[],\"terminal_reason\":\"completed\",\"fast_mode_state\":\"off\",\"fast_mode_disabled_reason\":\"sdk_opt_in_required\",\"subagent_stats\":{\"spawned\":0,\"requested\":{\"background\":0,\"foreground\":0,\"unset\":0},\"started_in_background\":0,\"max_depth\":0,\"spawned_by_subagents\":0,\"completed\":0,\"failed\":0,\"killed\":{\"parent\":0,\"user\":0,\"system\":0},\"refused\":{\"depth_limit\":0,\"concurrency_limit\":0,\"budget\":0},\"by_type\":{}},\"subtype\":\"success\",\"api_error_status\":null,\"result\":\"Done. [View your report](computer://[REDACTED:local-path:d2b464b90d0a]/mnt/outputs/report.md)\",\"ttft_ms\":3151,\"ttft_stream_ms\":2390,\"time_to_request_ms\":48,\"type\":\"result\",\"duration_ms\":6111,\"uuid\":\"868640ee-6647-418b-a982-838df8fd34ad\",\"queued_turn_count\":0}" ], "controlOut": [ "{\"type\":\"control_request\",\"request_id\":\"init-1\",\"request\":{\"subtype\":\"initialize\",\"appendSubagentSystemPrompt\":\"## Cowork environment\\n\\nYou are a subagent in a Cowork session that runs on the user's own machine. Your file tools operate on\\nthe user's real filesystem — the working directory is `[REDACTED:local-path:d2b464b90d0a]/mnt/outputs` — so read or write only inside folders\\nthe user has attached to this session. Shell commands go through `mcp__workspace__bash` and execute in\\nan isolated Linux environment, where those attached folders are mounted under `/sessions/local_8wjsq1fl69/mnt/`.\\n\\nEvery shell command starts out in `/sessions/local_8wjsq1fl69`. Anything written outside `/sessions/local_8wjsq1fl69/mnt/` — `/tmp`\\nincluded — stays behind in that Linux environment: it never reaches the user, and your file tools\\ncannot see it.\",\"sdkMcpServers\":[\"workspace\",\"cowork\",\"skills\",\"plugins\"],\"hooks\":{\"PreToolUse\":[{\"matcher\":\"Task\",\"hookCallbackIds\":[\"cowork-task-bg-block\"]},{\"matcher\":\"Read|Write|Edit|Glob|Grep|MultiEdit\",\"hookCallbackIds\":[\"hostloop-path-gate\"]}]},\"toolAliases\":{\"Bash\":\"mcp__workspace__bash\",\"WebFetch\":\"mcp__workspace__web_fetch\"}}}", "{\"type\":\"user\",\"message\":{\"role\":\"user\",\"content\":[{\"type\":\"text\",\"text\":\"Write a file at outputs/report.md whose contents are exactly the line: hostloop smoke.\\nThen, in your reply, share that file with me as a computer:// link so I can open it.\\n\"}]}}", "{\"type\":\"control_response\",\"response\":{\"subtype\":\"success\",\"request_id\":\"79c0ea9b-f2cc-4673-9f67-708874e39070\",\"response\":{\"mcp_response\":{\"jsonrpc\":\"2.0\",\"id\":0,\"result\":{\"protocolVersion\":\"2025-11-25\",\"capabilities\":{\"tools\":{}},\"serverInfo\":{\"name\":\"workspace\",\"version\":\"1.0.0\"}}}}}}", "{\"type\":\"control_response\",\"response\":{\"subtype\":\"success\",\"request_id\":\"eb52cf09-fe60-4811-b694-80497de867e8\",\"response\":{\"mcp_response\":{\"jsonrpc\":\"2.0\",\"id\":0,\"result\":{\"protocolVersion\":\"2025-11-25\",\"capabilities\":{\"tools\":{}},\"serverInfo\":{\"name\":\"cowork\",\"version\":\"1.0.0\"}}}}}}", "{\"type\":\"control_response\",\"response\":{\"subtype\":\"success\",\"request_id\":\"17db2cbd-b0b7-4d03-91b7-6bb872413e0e\",\"response\":{\"mcp_response\":{\"jsonrpc\":\"2.0\",\"id\":0,\"result\":{\"protocolVersion\":\"2025-11-25\",\"capabilities\":{\"tools\":{}},\"serverInfo\":{\"name\":\"skills\",\"version\":\"1.0.0\"}}}}}}", "{\"type\":\"control_response\",\"response\":{\"subtype\":\"success\",\"request_id\":\"2157880a-6c7f-40af-ae36-818655e090eb\",\"response\":{\"mcp_response\":{\"jsonrpc\":\"2.0\",\"id\":0,\"result\":{\"protocolVersion\":\"2025-11-25\",\"capabilities\":{\"tools\":{}},\"serverInfo\":{\"name\":\"plugins\",\"version\":\"1.0.0\"}}}}}}", "{\"type\":\"control_response\",\"response\":{\"subtype\":\"success\",\"request_id\":\"34a60763-b03d-49ff-825c-d0b0bd3dcade\",\"response\":{}}}", "{\"type\":\"control_response\",\"response\":{\"subtype\":\"success\",\"request_id\":\"5965ca1c-9dce-43ff-93ba-0f99af8503f2\",\"response\":{}}}", "{\"type\":\"control_response\",\"response\":{\"subtype\":\"success\",\"request_id\":\"d055c584-3ae3-4068-8fa7-fb31f345f54d\",\"response\":{}}}", "{\"type\":\"control_response\",\"response\":{\"subtype\":\"success\",\"request_id\":\"e6759edc-c1fd-4caf-9f54-a5e02238807b\",\"response\":{}}}", "{\"type\":\"control_response\",\"response\":{\"subtype\":\"success\",\"request_id\":\"fed6d586-7790-455b-bf9f-5e2a393d8747\",\"response\":{\"mcp_response\":{\"jsonrpc\":\"2.0\",\"id\":1,\"result\":{\"tools\":[{\"name\":\"bash\",\"description\":\"Run a shell command in the session's isolated Linux workspace. Your connected folders are mounted under /sessions/local_8wjsq1fl69/mnt/ — the Shell access section of your system prompt lists the exact path for each folder. Each bash call is independent (no cwd/env carryover). Use absolute paths.\",\"inputSchema\":{\"type\":\"object\",\"properties\":{\"command\":{\"type\":\"string\"},\"timeout_ms\":{\"type\":\"number\"}},\"required\":[\"command\"]}},{\"name\":\"web_fetch\",\"description\":\"Fetch a URL from the session network (subject to the egress allowlist). web_fetch can only retrieve URLs that appeared in a user message or a prior result.\",\"inputSchema\":{\"type\":\"object\",\"properties\":{\"url\":{\"type\":\"string\"}},\"required\":[\"url\"]}}]}}}}}", "{\"type\":\"control_response\",\"response\":{\"subtype\":\"success\",\"request_id\":\"aae0edee-4a4c-4fc3-8453-c900f9a90976\",\"response\":{\"mcp_response\":{\"jsonrpc\":\"2.0\",\"id\":1,\"result\":{\"tools\":[{\"name\":\"present_files\",\"description\":\"Deliver a file to the user so they can open it on their own computer. If the file is in your scratchpad (not under a mounted folder), it is copied into mnt/outputs first and the new path is returned — keep working against that returned path, not the scratchpad original.\",\"inputSchema\":{\"type\":\"object\",\"properties\":{\"files\":{\"type\":\"array\",\"items\":{\"type\":\"object\",\"properties\":{\"file_path\":{\"type\":\"string\"}},\"required\":[\"file_path\"]}}},\"required\":[\"files\"]},\"_meta\":{\"anthropic/alwaysLoad\":true}}]}}}}}", "{\"type\":\"control_response\",\"response\":{\"subtype\":\"success\",\"request_id\":\"3d11e34a-275b-42fe-95e4-e1548f5e1e48\",\"response\":{\"mcp_response\":{\"jsonrpc\":\"2.0\",\"id\":1,\"result\":{\"tools\":[{\"name\":\"list_skills\",\"description\":\"List the skills installed in this session. Omit skill_names to show every installed skill; pass skill_names to highlight specific ones, or keywords to filter by topic. Call this with no arguments when the user asks what skills they have or to show their skills. If nothing matches, fall back to suggest_skills.\",\"inputSchema\":{\"type\":\"object\",\"properties\":{\"skill_names\":{\"type\":\"array\",\"items\":{\"type\":\"string\"}},\"keywords\":{\"type\":\"array\",\"items\":{\"type\":\"string\"}},\"context_label\":{\"type\":\"string\"}},\"required\":[]},\"_meta\":{\"anthropic/alwaysLoad\":true}},{\"name\":\"suggest_skills\",\"description\":\"Render an interactive widget of standalone skills the user can add — org, shared, or Anthropic skills that are not yet enabled — each with an Add button. Call this when the user's task is the kind a skill would make repeatable (drafting to a house style, reviewing against a playbook or checklist, recurring reports, a domain workflow they will do again) and nothing they have installed covers it; the user does not have to ask about skills first. Also call it when they ask for recommendations outright, ask about a domain they have nothing installed for, or when list_skills came back with no matches. For skills they already have, use list_skills instead.\\nDo NOT call this when: the task is a one-off you can simply answer; you are not confident a skill would genuinely help; or you already rendered a suggestion earlier in this conversation and the user did not engage with it.\\nPass keywords taken from the task itself rather than generic terms, and set trigger — \\\"proactive\\\" when you raised this from task context, \\\"user_asked\\\" when the user asked. This covers standalone skills only, so when search_plugins is available call it too, with the same keywords and the same trigger (a relevant skill may live inside an uninstalled plugin). Do NOT write a lead-in before calling this — pass context_label for the header instead. The result may come back empty; its note field tells you what to do next.\",\"inputSchema\":{\"type\":\"object\",\"properties\":{\"keywords\":{\"type\":\"array\",\"items\":{\"type\":\"string\"}},\"context_label\":{\"type\":\"string\"},\"trigger\":{\"type\":\"string\",\"enum\":[\"user_asked\",\"proactive\"]}},\"required\":[]},\"_meta\":{\"anthropic/alwaysLoad\":true}}]}}}}}", "{\"type\":\"control_response\",\"response\":{\"subtype\":\"success\",\"request_id\":\"8562e299-6c7a-4ec2-a25b-c126eee50b0f\",\"response\":{\"mcp_response\":{\"jsonrpc\":\"2.0\",\"id\":1,\"result\":{\"tools\":[{\"name\":\"list_plugins\",\"description\":\"List the plugins installed in this session, each with its skills. Omit keywords to show every installed plugin; pass keywords to filter by topic over each plugin's name/description/skills. context_label is a display-only header — it does not filter.\",\"inputSchema\":{\"type\":\"object\",\"properties\":{\"keywords\":{\"type\":\"array\",\"items\":{\"type\":\"string\"}},\"context_label\":{\"type\":\"string\"}},\"required\":[]},\"_meta\":{\"anthropic/alwaysLoad\":true}},{\"name\":\"search_plugins\",\"description\":\"Search for a plugin that could help with the user's request. Pass userIntent as the request verbatim or lightly paraphrased (not pre-tokenized keywords); keywords is optional extra filtering. Set includeInstalled to also consider already-installed plugins (onboarding).\",\"inputSchema\":{\"type\":\"object\",\"properties\":{\"userIntent\":{\"type\":\"string\"},\"keywords\":{\"type\":\"array\",\"items\":{\"type\":\"string\"}},\"includeInstalled\":{\"type\":\"boolean\"},\"trigger\":{\"type\":\"string\",\"enum\":[\"user_asked\",\"proactive\"]}},\"required\":[\"userIntent\"]},\"_meta\":{\"anthropic/alwaysLoad\":true}},{\"name\":\"suggest_plugin_install\",\"description\":\"Render an install suggestion for one or more plugins. contextLabel is a short (3-5 word) header (\\\"For your …\\\"); plugins is the list of candidates to suggest, each with pluginName, pluginId, and description.\",\"inputSchema\":{\"type\":\"object\",\"properties\":{\"contextLabel\":{\"type\":\"string\"},\"plugins\":{\"type\":\"array\",\"items\":{\"type\":\"object\",\"properties\":{\"pluginName\":{\"type\":\"string\"},\"pluginId\":{\"type\":\"string\"},\"description\":{\"type\":\"string\"},\"backendId\":{\"type\":\"string\"},\"skills\":{\"type\":\"array\",\"items\":{\"type\":\"object\",\"properties\":{\"name\":{\"type\":\"string\"},\"description\":{\"type\":\"string\"}},\"required\":[\"name\"]}}},\"required\":[\"pluginName\",\"pluginId\",\"description\"]}}},\"required\":[\"contextLabel\",\"plugins\"]},\"_meta\":{\"anthropic/alwaysLoad\":true}}]}}}}}", "{\"type\":\"control_response\",\"response\":{\"subtype\":\"success\",\"request_id\":\"716c05ff-5352-4a59-94b3-5688b38f622e\",\"response\":{}}}" ], "effectiveFidelity": "hostloop", "artifacts": [ { "path": "outputs/report.md", "bytes": 16, "sha256": "b8278fc1e039bec9037a7dab37cb864eaed51356f108bf1541cadbd02c9a4500", "body": "hostloop smoke.\n" } ], "userVisibleRoots": [ "outputs" ], "preRunPaths": [], "preRunOrigin": "local-walk", "preRunHashes": {}, "scenarioSource": "../scenarios/hostloop-computer-links.yaml", "fingerprint": { "baseline": "1.37937.1", "hashFormat": "jcs1", "promptAssetsHash": "491afe2862dc67ea" }, "timeline": [ { "seq": 0, "ts": 1238, "line": 0, "type": "tool_use", "name": "mcp__workspace__*", "skillScope": "(root)" }, { "seq": 1, "ts": 1240, "line": 1, "type": "tool_use", "name": "mcp__cowork__*", "skillScope": "(root)" }, { "seq": 2, "ts": 1240, "line": 2, "type": "tool_use", "name": "mcp__skills__*", "skillScope": "(root)" }, { "seq": 3, "ts": 1240, "line": 3, "type": "tool_use", "name": "mcp__plugins__*", "skillScope": "(root)" }, { "seq": 4, "ts": 1281, "line": 5, "type": "tool_use", "name": "mcp__workspace__*", "skillScope": "(root)" }, { "seq": 5, "ts": 1281, "line": 6, "type": "tool_use", "name": "mcp__cowork__*", "skillScope": "(root)" }, { "seq": 6, "ts": 1281, "line": 7, "type": "tool_use", "name": "mcp__skills__*", "skillScope": "(root)" }, { "seq": 7, "ts": 1281, "line": 8, "type": "tool_use", "name": "mcp__plugins__*", "skillScope": "(root)" }, { "seq": 8, "ts": 1283, "line": 9, "type": "tool_use", "name": "mcp__workspace__*", "skillScope": "(root)" }, { "seq": 9, "ts": 1283, "line": 10, "type": "tool_use", "name": "mcp__cowork__*", "skillScope": "(root)" }, { "seq": 10, "ts": 1284, "line": 11, "type": "tool_use", "name": "mcp__skills__*", "skillScope": "(root)" }, { "seq": 11, "ts": 1284, "line": 12, "type": "tool_use", "name": "mcp__plugins__*", "skillScope": "(root)" }, { "seq": 12, "ts": 5047, "line": 15, "type": "tool_use", "toolUseId": "toolu_01MSgRxTaGPi9fCZAVPY5oAD", "name": "Write", "model": "claude-opus-4-8", "skillScope": "(root)" }, { "seq": 13, "ts": 5070, "line": 18, "type": "tool_result", "toolUseId": "toolu_01MSgRxTaGPi9fCZAVPY5oAD", "isError": false }, { "seq": 14, "ts": 7437, "line": 20, "type": "result", "isError": false } ], "timelineHeader": { "v": 1, "startedAtWall": "2026-08-26T07:14:16.009Z", "startedAtMono": "904307691903041" }, "sessionFingerprint": "d9334c705e89ea65b17fde17c233c079bd15c7e330d92f20f069000111571450", "folderPrefixMap": [], "environment": { "location": "local", "tier": "hostloop", "harnessVersion": "2.2.0", "agentImage": { "ref": "cowork-agent-base:2", "configId": "sha256:ba8495bdda17ad3f05d67f2942c2baf695676df037a5cc97f7320846af4b3697", "registryDigest": "sha256:ba8495bdda17ad3f05d67f2942c2baf695676df037a5cc97f7320846af4b3697" } } }