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Proposal: durable cA2A task submissions and safe retries

オープン
#301 コメント 1 件 リアクション 0 件 担当者 0 名 GitHub で見る

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まだ誰も着手していません。

評価

難易度
5/5
見積もり時間
1週間以上
初心者へのやさしさ
35/100
issue の種類
機能追加
明瞭さ
おおむね明確
活発さ
活発
技術スタック
python

調査の方向性

Start by reading the current authenticated-response profile and its stated limits on deduplication and restart recovery, then review the upstream A2A safe-retries discussion at a2aproject/A2A#1942. The proposal calls for a threat model, contract document, persistent ledger, and official A2A SDK integration test; first agree the profile scope and holder-proof binding with maintainers. Done means an approved design and tests covering duplicate requests, conflicting content, and crash uncertainty.

索引モデルが issue の本文から書いたものです。

説明

enhancement

Problem statement

I'm a first-time contributor interested in cA2A's A2A integration. If a caller sends a delegated task but loses the response, it may not know whether the callee executed it. Retrying can invoke the handler again. The current authenticated-response profile explicitly leaves request execution deduplication and restart recovery out of scope.

Proposed solution

I'd like to explore an opt-in durable-task profile that binds a stable intent ID and digest to the holder proof, then atomically stores the authorized intent and A2A Task ID before dispatch. A repeated valid request with the same principal and intent would return the existing Task ID without another handler invocation; the same ID with different content would be refused. A crash during execution would remain explicitly uncertain until reconciled, rather than being retried automatically.

I would start with a contract and threat-model document, then a small persistent ledger and an official A2A SDK integration test. I'm asking for scope and design feedback before coding. I'm also requesting a first-contributor vouch for @adityardesai if this is an appropriate area to work on. I used Codex to help draft this proposal, and will review and understand any change I submit.

Alternatives considered

  • Reusing only record_id or the current response session: neither is a durable idempotency contract. The response session is intentionally one-use.
  • Retrying every timed-out request: this can duplicate side effects.
  • Defining a general A2A idempotency mechanism here: upstream A2A is discussing safe retries in a2aproject/A2A#1942. This proposal should align with that work.

Security/TEE impact

This changes the authorization boundary: the stable intent must be bound to the verified holder and all inputs the protected handler uses. The ledger must reserve atomically across workers and fail closed when unavailable. This proposal makes no new TEE or exactly-once external-effect claim.

Spec alignment

No trace-spec change is proposed in the first phase. A versioned cA2A extension/profile and holder-proof binding would need maintainer review. The official A2A Task and message-send semantics should remain intact.

主要言語
Python
スター
9
フォーク
14
平均マージ
1日 8時間
マージ済み PR(30日)
36

環境構築

はじめの一歩

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  2. 着手することを issue にコメントします — 二人が同じ作業をするのを防げます。
  3. リポジトリをフォークし、ブランチを切って変更します。
  4. issue 番号を参照したプルリクエストを送ります。

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