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Ollama Modelfile and companion
A Modelfile that carries your instructions and sets the context window on purpose, with the checks that show it loaded.
5 steps · 573 words · Markdown format · Reviewed 2026-10-12
Tools: freeOllamaran in Claude Coderan in Ollamaself-checkdone checkchecked 2026-10-12OllamaClaude CodeCodexOpenCodechat onlyalways on7B okcodingops
What the pill colors mean
- paidfree alternativefree what running it costs you beyond the file: a paid service, a paid service with a free route (hover it), or nothing
- DockerAPI key what you must bring: software, an account or a key
- ran in (tool)self-checkdone check evidence: we ran it in that tool, or the file carries its own check
- checked 2026-10-12 the day it was last checked against official docs; not a run
- Any AI where it works; each brief page says where to put it
- shellchat only what your AI app must be able to do
- on demand when your AI reads it
- frontier the smallest model it was written for
- codingbuilding what it is for, and the build stage it fits
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Put it here
Always on: put it where your tool reads instructions every session:
Ollama
Put the text in a Modelfile as SYSTEM """...""" with FROM <model> and PARAMETER num_ctx <n>, then ollama create <name> -f Modelfile and run <name>. Chat-only: paste it as the first message instead.
Reload: ollama create again
Check it loaded: ollama show --modelfile <name> prints the SYSTEM; ollama ps shows the loaded context size
Checked against the official page on 2026-10-12.
Claude Code
Save as CLAUDE.md in the project root, or .claude/CLAUDE.md. Other agents share the repo: put the shared rules in AGENTS.md and make CLAUDE.md one line, @AGENTS.md. Commit it. Start a new session: the file is read at launch.
Reload: new session (or /memory to open the files)
Check it loaded: /context lists the Memory files it read; /skills, /agents, /hooks list the rest; the InstructionsLoaded hook event fires once per loaded instruction file
Checked against the official page on 2026-10-12.
Codex
Save as AGENTS.md in the repo root. Codex concatenates AGENTS.md from the git root down to the working directory, closer wins. Commit it. Start a new session.
Reload: new session
Check it loaded: ask: Summarize the current instructions; codex status
Checked against the official page on 2026-10-12.
OpenCode
Save as AGENTS.md in the project root. Commit it. Start a new session.
Reload: new session
Check it loaded: none documented: ask it to repeat one rule from the file
Checked against the official page on 2026-10-12.