docs(j5): record the design sessions for multi-player and what follows

[Jacksondr5]

Problem

J5's next features were worked out in conversation: share links, several people in one conversation, hosted servers with agents that run elsewhere, a "what happened since I last looked" view, and the human attention spectrum. The definitions say what was decided; nothing said how.

What changed

Adds four records under docs/j5/worklog/, one per session:

Record	Covers	State
2026-10-09-multi-player-session.md	Share links, and several people in one conversation; a second read of the code; the review of the definitions	Carried by the Shared server and shared conversations definitions (#529). Build tracked in #531, #532, #533; second-version items in #534
2026-10-10-hosted-server-session.md	Three shapes for a company-hosted server, and the order of work (v1, v2, v3)	Thinking kept for later, by Jackson's ruling. Nothing designed
2026-10-10-catch-up-session.md	A per-person read marker and caught-up pointer, and a catch-up summary written by a small model	Proposals. No definition or issue yet
2026-10-10-attention-spectrum-session.md	The spectrum as three bands, what counts as a signal, and the signals a Fleet page row carries	Proposals. Stopped at the agent's side, which is recorded as not ruled

The records are not definitions and nothing here is built. The code facts in them come from reading the server only, and each record says what was not verified.

Checklist

• One concern: the description has no "also"
• Tests cover the changed behavior (backend changes ship with focused tests): docs only, no behavior changes
• UI changes: before/after screenshots above, and a video for motion or interaction: no UI changes
• Upstream-owned files: each one is recorded in FORK.md (case text and file-table row) in this PR: none edited
• Upstream product: any change to what upstream's product does has a human decision linked above and a register entry in docs/j5/product/upstream.md: nothing changes; the register entries are owed by the PRs that build share links and the per-person read marker
• Surfaces: entry points, clients, providers, contracts, reverse states, connection modes (see AGENTS.md): docs only
• Docs: definitions under docs/j5/product/ and user docs rewritten where this changes them: done separately in docs(j5): define members, guests, grants and shared conversations #529

Opus 5.5, Claude Code in J5 Code.

🤖 Generated with Claude Code

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated
j5-code	Ready	Preview	Oct 11, 2026 5:29pm UTC

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: Path: .coderabbit.config.ts
• Review profile: CHILL
• Plan: Essentials
• Run ID: 90888705-1bcd-4570-9cc8-4d074f56f39d

---

---

📥 Commits

Reviewing files that changed from the base of the PR and between 822cfe5 and beda550.

---

---

📒 Files selected for processing (4)

• docs/j5/worklog/2026-10-09-multi-player-session.md
• docs/j5/worklog/2026-10-10-attention-spectrum-session.md
• docs/j5/worklog/2026-10-10-catch-up-session.md
• docs/j5/worklog/2026-10-10-hosted-server-session.md

---

---

Included review availability: This review used your included allowance. 0 included reviews remain after this review. Your included PR review attempts over the past 7 days set your current allowance at 3 reviews per hour.

---

---

---

📝 Walkthrough

📝 Walkthrough

Walkthrough

This PR adds four dated J5 worklogs. They record multi-player, attention-spectrum, catch-up, and hosted-server discussions, including proposals, session rulings, implementation assumptions, and unresolved questions.

Changes

Multi-player session

Layer / File(s)	Summary
Grants and session access docs/j5/worklog/2026-10-09-multi-player-session.md	Records person, project, and thread grants; view and collaborate capabilities; sharing authority; and proposed session permission handling.
Shared conversation behavior docs/j5/worklog/2026-10-09-multi-player-session.md	Records proposed message attribution, member and guest interactions, shared history, and access removal behavior.
Implementation findings and later rulings docs/j5/worklog/2026-10-09-multi-player-session.md	Corrects implementation assumptions about permission checks and routes. Records later rulings about prompts, Crew rosters, and guest access. The document says the feature is not built.

Attention spectrum session

Layer / File(s)	Summary
Bands and positioning principles docs/j5/worklog/2026-10-10-attention-spectrum-session.md	Defines proposed attention bands and records principles for agent position, movement, and snooze behavior.
Signals and Fleet presentation docs/j5/worklog/2026-10-10-attention-spectrum-session.md	Records proposed row information based on measured or agent-declared signals, plus proposed Fleet placement and event presentation.
Agent interaction and multi-person scope docs/j5/worklog/2026-10-10-attention-spectrum-session.md	Lists unresolved questions about agent awareness and tool behavior. Sets aside multi-person behavior and notes shared per-thread values.

Catch-up session

Layer / File(s)	Summary
Read and caught-up pointers docs/j5/worklog/2026-10-10-catch-up-session.md	Describes the existing shared read marker and proposes separate per-person read and caught-up pointers.
Summary generation and scope docs/j5/worklog/2026-10-10-catch-up-session.md	Proposes a separate summary model and text-helper job. Defines summary inputs, privacy, and guest access. The worklog states these changes are not implemented.

Hosted server session

Layer / File(s)	Summary
Deployment shapes and current execution docs/j5/worklog/2026-10-10-hosted-server-session.md	Describes current agent execution and compares shared-server, container, and vendor-cloud deployment shapes.
Roadmap and deployment requirements docs/j5/worklog/2026-10-10-hosted-server-session.md	Records the proposed mix of deployment shapes and sequencing. Lists container and vendor-cloud considerations.
Identity and multi-member scope docs/j5/worklog/2026-10-10-hosted-server-session.md	Records identity and attribution concerns and assigns a multi-member-server question to the second-version scope. The document states that no design is settled.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~12 minutes

Change: Other

---

---

Merge Risk: ⚪ Minimal · up to beda5

The worklogs record proposals without changing application behavior; no actionable merge-blocking risk remains.

Pre-merge checks | 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Title check		The title accurately identifies the main change: recording J5 design sessions for multi-player features and related follow-up topics. It is concise and specific enough for project history.
Description check		The description includes the problem, scope, changed files, feature status, checklist, UI and upstream impact decisions, and the model and harness used. It is consistent with the docs-only changes. Th…

---

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Commit to this branch
• Create a new PR

---

---

---

• Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

---

_{Comment @coderabbitai help to get the list of available commands.}