MemoryRouter
Fix

Context window exceeded: what happens next

The window is the model’s working memory for one request. When the conversation exceeds it, either the request fails or something quietly drops. Both outcomes cost you work.

Sources checked 2026-09-25.

What the limit actually does

Agent tools do not usually fail with an error. They manage the window: older turns are summarized, old tool results are cleared, and the session continues with a compressed version of history. Reports from Claude Code users describe exactly this silent degradation, including tool results cleared without notification.

The compression is where the damage happens. Summaries keep the narrative and drop the details that code needs: exact names, constraints, and the reasons a path was rejected.

Chat products behave differently. A conversation that runs long gets summarized or trimmed, and the quality of answers drops as context gets thinner.

Free fixes you can do today

These work today, with no new tools.

  1. 1

    Anchor critical context in files

    Anything in a file can be re-read after any window event. Anything only in history is at risk.

  2. 2

    Start a new session with a written brief

    When you do reset, open with the decisions file and a three-line state of play. It costs thirty seconds and removes an hour of re-explanation.

  3. 3

    Reduce tool output noise

    Huge logs and full-file dumps eat the window fast. Ask for targeted greps and diffs instead.

  4. 4

    Split work by phase

    Plan in one session, implement in another, review in a third. Each phase starts with a smaller, more honest context.

The durable fix

Memory is the layer that survives window events. MemoryRouter recalls relevant context before each prompt and captures each completed turn, so a fresh session or a compacted one starts with your project state instead of a blank page.

On Claude Code the hooks run automatically at every lifecycle point, including right after compaction. On Cursor, Zed, Cline, and other MCP clients, the agent calls search and store tools as it works.

  1. 1

    Install the hooks where they exist

    Claude Code

    npx -y memoryrouter-claude init
  2. 2

    Connect the rest over MCP

    Editors and CLIs point at the same endpoint, so every tool contributes to one memory instead of its own silo.

    MCP endpoint

    https://mcp.memoryrouter.ai/mcp

Full setup guide: Claude Code setup guide

Start a MemoryRouter vault

14-day free trial. Install the Claude Code or Codex package in about three minutes.

Related

conversation too long

The tell is subtle.

Claude Code lost context after compaction

One compaction event, and the session forgets the plan, the file names, and the constraint you spent an hour explaining.

Claude Code memory

Keep project decisions across sessions and compaction with the published hook package.

FAQ

Sources

Sources checked 2026-09-25. Tool behavior changes; check the vendor docs before relying on a detail.

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