Observed Signal · May 21, 2026 · Technical Release · Source: DEV Community · Impact: 2/5 · Sentiment: Positive
Agenttap: Capture What SDKs Actually Send
A developer published agenttap, an open-source httpx transport that intercepts and records the exact HTTP request bytes and responses produced by LLM SDKs. The tool lets engineers capture full request URLs and headers (with credentials redacted), exact request bodies (decoded as JSON when possible), response status/duration/body, and a monotonic sequence number. Agenttap supports replaying captured bytes, diffing recordings to find regressions, in-memory capture with ~0.4 ms overhead per 2 KB call, a default ring buffer of 500 records, and options to persist captures to disk. The transport is provider-agnostic (works with Anthropic, OpenAI, Google clients, etc.), is available on GitHub and PyPI, and is positioned as a debugging/observability aid for teams integrating LLMs.
Practical developer tool that improves observability and debugging of LLM SDK integrations by revealing the literal JSON sent over the wire; useful for reliability, reproducibility and compliance but not industry-shifting.
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Key Takeaways & Evidence Grounding
- Agenttap is an open-source httpx transport that intercepts outbound HTTP requests and responses.
- It captures request URL/headers (authorization and x-api-key redacted), exact request body bytes (decoded to JSON when possible), response status, duration, response body, and a monotonic sequence number.
- Agenttap provides replay and diff utilities to replay exact captured bytes and to diff two recordings to find byte-level changes.
- Measured overhead is about 0.4 ms per call for a 2 KB body when capturing in memory; default ring buffer stores the last 500 records and can flush to disk.
- Repository is available on GitHub (MukundaKatta/agenttap) and the package is published on PyPI (pip install agenttap).
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