history-backfill

history-backfill is a skill for Claude Code, Codex from robotaitai/project-bedrock. It costs 46 tokens per session (1,072 once invoked), scanned A, original, MIT.

A workflow for rebuilding project memory from existing evidence such as source code, documentation, configuration, Git history, tasks, and agent sessions. It separates raw evidence from the curated facts an agent relies on.

In plain words
What is it for?
Use it to import repository and session history, generate discovery summaries, and write stable project facts into the appropriate memory areas.
Why use it?
It helps a new or incomplete project-memory tree recover useful history without treating unreviewed source material as final truth.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: mentions CLAUDE.md; mentions AGENTS.md.

Good fit Use it to import repository and session history, generate discovery summaries, and write stable project facts into the appropriate memory areas.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/robotaitai/project-bedrock/history-backfill
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add robotaitai/project-bedrock --skill history-backfill
Clone the repo
git clone --depth 1 https://github.com/robotaitai/project-bedrock

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for history-backfill

README.md
[![agentmods](https://agentmods.dev/badge/skills/robotaitai/project-bedrock/history-backfill/github.svg)](https://agentmods.dev/skills/robotaitai/project-bedrock/history-backfill)
Your own site
<a href="https://agentmods.dev/skills/robotaitai/project-bedrock/history-backfill"><img src="https://agentmods.dev/badge/skills/robotaitai/project-bedrock/history-backfill/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for history-backfill

Your own site · 80×15
<a href="https://agentmods.dev/skills/robotaitai/project-bedrock/history-backfill"><img src="https://agentmods.dev/badge/skills/robotaitai/project-bedrock/history-backfill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 46 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,072 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00046 $0.01072
Opus 5 $0.00023 $0.00536
Sonnet 5 $0.00009 $0.00214
Haiku 4.5 $0.00005 $0.00107

Measured 12d ago against content hash b36ccab5329e, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

history-backfill scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

assets/skills/history-backfill/SKILL.md · 116 lines

How it starts

The opening of the file, as written. The whole thing — 116 lines — stays where its author put it; the contents beside it link to each section on GitHub.

History Backfill

Reads raw evidence from the repo and existing artifacts, then distills stable facts into the curated memory tree.

Use this after project-ontology-bootstrap when the project has existing history.


Separation rule -- enforced, never relaxed

Location What goes here Who edits it
agent-knowledge/Evidence/raw/ Direct snapshots from the current repo state Only the import script
agent-knowledge/Evidence/imports/ Imported docs, tasks, sessions, traces, graph exports Only the import script
agent-knowledge/Outputs/ Generated discovery summaries and structural maps Only scripts or agents treating them as non-canonical outputs
agent-knowledge/Memory/ Curated, stable, distilled facts Only the agent, via writeback rule

Never write raw evidence into memory. Never treat evidence as authoritative -- it is input for judgment, not truth.


Step 1 -- Collect evidence

Run the import script:

scripts/import-agent-history.sh /path/to/project

This creates evidence files under Evidence/raw/ and Evidence/imports/, and generated summaries under Outputs/.


Step 2 -- Read evidence in priority order

Read these files in order. Each source has different signal quality:

  1. imports/existing-docs.txt -- highest signal. README, CLAUDE.md, AGENTS.md, and project metadata contain curated intent.
  2. raw/manifests.txt -- authoritative for stack and dependency boundaries.
  3. raw/config-files.txt -- strongest signal for conventions and tooling.
  4. raw/tests.txt and raw/ci-workflows.txt -- how the project proves and ships behavior.
  5. raw/structure.txt -- actual architecture shape.
  6. imports/tasks.txt and imports/session-files.txt -- recurring work areas and unresolved questions.
  7. raw/git-log-detail.txt and raw/git-log.txt -- what changed and why.
  8. imports/trace-index.txt -- supplemental traces only; never canonical truth.

Read the full file on GitHub · 116 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 12d ago First seen · 116 lines · 46 tokens per session scan A b36ccab5329e

Subscribe to this mod's changes

history-backfill is a skill published in the GitHub repository robotaitai/project-bedrock (45 stars, last pushed 22d ago), licensed MIT. It adds 46 tokens to every session and 1,072 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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