feat(FN-3758): align web fetch test coverage and documentation

Aligns web fetch tool test coverage across multiple test suites and updates the agents documentation, with a patch changeset for `@runfusion/fusion`.

Fusion-Task-Id: FN-3758

packages/cli/skill/fusion/SKILL.md

@@ -33,7 +33,7 @@ Mission → Milestone → Slice → Feature → Task
 - **Agent tools** — `fn_agent_stop`, `fn_agent_start`, `fn_list_agents`, `fn_delegate_task`, `fn_agent_show`, `fn_agent_org_chart`
 - **Skills tools** — `fn_skills_search`, `fn_skills_install`
 - **Insight tools** — `fn_insight_list`, `fn_insight_show`, `fn_insight_run_list`, `fn_insight_run_show`
-- **Other tools** — `fn_research_run`, `fn_research_list`, `fn_research_get`, `fn_research_cancel`, `fn_research_retry`
+- **Other tools** — `fn_web_fetch`, `fn_research_run`, `fn_research_list`, `fn_research_get`, `fn_research_cancel`, `fn_research_retry`
 <!-- END: tool-categories -->
 - **Dashboard** — Use `/fn` command to start/stop the dashboard
 

packages/cli/skill/fusion/references/engine-tools.md

@@ -18,6 +18,7 @@ These tools are **not** part of the user-invokable extension surface. They are i
 | `fn_memory_search` | triage, executor, heartbeat | Search project memory plus per-agent layered memory snippets | `query` (string), `limit?` (number) |
 | `fn_memory_get` | triage, executor, heartbeat | Read a bounded memory file window (including bounded per-agent layered paths) | `path` (string), `startLine?` (number), `lineCount?` (number) |
 | `fn_memory_append` | executor, heartbeat (when writable backend enabled) | Append memory notes with explicit scope: `scope="agent"` for private operating context, `scope="project"` for workspace-wide durable knowledge | `scope?` (`project` \| `agent`), `layer` (`long-term` \| `daily`), `content` (string) |
+| `fn_web_fetch` | executor, step-session, heartbeat | Lightweight HTTP fetch with HTML→text extraction, timeout/size caps, and SSRF guard (no JS rendering) | `url` (string), `prompt?` (string), `timeoutMs?` (number), `maxBytes?` (number) |
 | `fn_research_run` | triage, executor | Start a bounded research run (optionally wait for completion) and return structured findings metadata | `query` (string), `wait_for_completion?` (boolean), `max_wait_ms?` (number) |
 | `fn_research_list` | triage, executor | List recent research runs with status/summary metadata | `status?` (`pending` \| `running` \| `completed` \| `failed` \| `cancelled`), `limit?` (number) |
 | `fn_research_get` | triage, executor | Read one research run's structured findings/citations payload | `id` (string) |

packages/cli/skill/fusion/references/extension-tools.md

@@ -364,6 +364,17 @@ Show a single insight-generation run by ID.
 
 ## Other Tools
 
+### fn_web_fetch
+
+Lightweight URL fetch (no JS rendering). Use agent-browser skill for JS-heavy pages. URL to fetch (http/https) Optional extraction hint for downstream summarization Timeout in milliseconds (default: 30000) Max bytes to return (default: 512000)
+
+| Parameter | Type | Required | Description |
+|-----------|------|----------|-------------|
+| `url` | string | ✓ | URL to fetch (http/https) |
+| `prompt` | string | — | Optional extraction hint for downstream summarization |
+| `timeoutMs` | number | — | Timeout in milliseconds (default: 30000) |
+| `maxBytes` | number | — | Max bytes to return (default: 512000) |
+
 ### fn_research_run
 
 Start a bounded research run and optionally wait for findings.

packages/cli/skill/fusion/references/fusion-capabilities.md

@@ -29,6 +29,7 @@ All skill/extension tool invocations in this catalog use the public `fn_*` names
 | `fn_task_import_github_issue` | Import a specific GitHub issue as a Fusion task. Fetches the issue by number and creates a single task in the planning column with the issue title and body. |
 | `fn_task_browse_github_issues` | List open GitHub issues from a repository to browse before importing. Returns issue numbers, titles, and URLs for selection. Use with fn_task_import_github_issue to import specific issues by number. |
 | `fn_task_plan` | Create a task via AI-guided planning mode — interactive conversation to refine your idea into a well-specified task. |
+| `fn_web_fetch` | Lightweight URL fetch (no JS rendering). Use agent-browser skill for JS-heavy pages. URL to fetch (http/https) Optional extraction hint for downstream summarization Timeout in milliseconds (default: 30000) Max bytes to return (default: 512000) |
 | `fn_research_run` | Start a bounded research run and optionally wait for findings. |
 | `fn_research_list` | List recent research runs. |
 | `fn_research_get` | Get one research run and structured findings. |