docs: add Related sections to 6 major tool pages

Add cross-linking Related sections to tool pages that were dead ends:
- exec, exec-approvals, browser, pdf, skills, lobster

Each page now links to 2-4 related topics for navigation continuity.

docs/tools/browser.md

@@ -816,3 +816,9 @@ How it maps:
   - If a browser-capable node is connected, the tool may auto-route to it unless you pin `target="host"` or `target="node"`.
 
 This keeps the agent deterministic and avoids brittle selectors.
+
+## Related
+
+- [Tools Overview](/tools) — all available agent tools
+- [Sandboxing](/gateway/sandboxing) — browser control in sandboxed environments
+- [Security](/gateway/security) — browser control risks and hardening

docs/tools/exec-approvals.md

@@ -493,3 +493,10 @@ Related:
 - [Exec tool](/tools/exec)
 - [Elevated mode](/tools/elevated)
 - [Skills](/tools/skills)
+
+## Related
+
+- [Exec](/tools/exec) — shell command execution tool
+- [Sandboxing](/gateway/sandboxing) — sandbox modes and workspace access
+- [Security](/gateway/security) — security model and hardening
+- [Sandbox vs Tool Policy vs Elevated](/gateway/sandbox-vs-tool-policy-vs-elevated) — when to use each

docs/tools/exec.md

@@ -208,3 +208,10 @@ Notes:
 - Config lives under `tools.exec.applyPatch`.
 - `tools.exec.applyPatch.enabled` defaults to `true`; set it to `false` to disable the tool for OpenAI models.
 - `tools.exec.applyPatch.workspaceOnly` defaults to `true` (workspace-contained). Set it to `false` only if you intentionally want `apply_patch` to write/delete outside the workspace directory.
+
+## Related
+
+- [Exec Approvals](/tools/exec-approvals) — approval gates for shell commands
+- [Sandboxing](/gateway/sandboxing) — running commands in sandboxed environments
+- [Background Process](/gateway/background-process) — long-running exec and process tool
+- [Security](/gateway/security) — tool policy and elevated access

docs/tools/lobster.md

@@ -338,3 +338,9 @@ One public example: a “second brain” CLI + Lobster pipelines that manage thr
 
 - Thread: [https://x.com/plattenschieber/status/2014508656335770033](https://x.com/plattenschieber/status/2014508656335770033)
 - Repo: [https://github.com/bloomedai/brain-cli](https://github.com/bloomedai/brain-cli)
+
+## Related
+
+- [Cron vs Heartbeat](/automation/cron-vs-heartbeat) — scheduling Lobster workflows
+- [Automation Overview](/automation) — all automation mechanisms
+- [Tools Overview](/tools) — all available agent tools

docs/tools/pdf.md

@@ -154,3 +154,8 @@ Page-filtered fallback model:
   "prompt": "Extract only customer-impacting incidents"
 }
 ```
+
+## Related
+
+- [Tools Overview](/tools) — all available agent tools
+- [Configuration Reference](/gateway/configuration-reference#agent-defaults) — pdfMaxBytesMb and pdfMaxPages config

docs/tools/skills.md

@@ -320,3 +320,10 @@ See [Skills config](/tools/skills-config) for the full configuration schema.
 Browse [https://clawhub.com](https://clawhub.com).
 
 ---
+
+## Related
+
+- [Creating Skills](/tools/creating-skills) — building custom skills
+- [Skills Config](/tools/skills-config) — skill configuration reference
+- [Slash Commands](/tools/slash-commands) — all available slash commands
+- [Plugins](/tools/plugin) — plugin system overview