Add portable session handoff

codex/skills/handoff/SKILL.md

@@ -0,0 +1,13 @@
+---
+name: handoff
+description: Compact the current conversation into a handoff document for another agent to pick up.
+argument-hint: "What will the next session be used for?"
+---
+
+Write a handoff document summarizing the current conversation so a fresh agent can continue the work. Save to the temporary directory of the user's OS - not the current workspace.
+
+Include a "suggested skills" section in the document, naming which installed skills the next agent should use.
+
+Do not duplicate content already captured in other artifacts (specs, plans, ADRs, issues, commits, diffs). Reference them by path or URL instead.
+
+If the user passed arguments, treat them as a description of what the next session will focus on and tailor the doc accordingly.

codex/skills/handoff/agents/openai.yaml

@@ -0,0 +1,5 @@
+interface:
+  display_name: "Handoff"
+  short_description: "Compact a conversation into a handoff"
+policy:
+  allow_implicit_invocation: false

codex/skills/handoff/references/sources.md

@@ -0,0 +1,35 @@
+# Sources
+
+Read this provenance when auditing or revising Handoff, not during normal use.
+
+The skill is substantially derived from Matt Pocock's `handoff` skill:
+
+- Source: https://github.com/mattpocock/skills/blob/0ab1b63a410a03d3627979a109c8695de27af954/skills/productivity/handoff/SKILL.md
+- Repository license: MIT
+- Upstream copyright: Copyright (c) 2026 Matt Pocock
+
+Compass keeps the upstream temporary-directory rule, suggested-skills section, artifact-reference discipline, redaction requirement, and argument-based focus. The only behavioral wording change translates Matt's Claude-style instruction to call the Skill tool into the portable requirement to name installed skills the next agent should use.
+
+## Upstream license
+
+MIT License
+
+Copyright (c) 2026 Matt Pocock
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

manifests/portable-files.json

@@ -17,6 +17,7 @@
       "design-prototype",
       "grilling",
       "ground-in-sources",
+      "handoff",
       "micro-experiment",
       "monitor",
       "no-comments",