rea/docs/web-network-captures.md

Historical web network captures

Use inspect_web_network_capture / inspect-web-network-capture to inspect retained producer evidence. This is an offline operation: recorded URLs are never fetched, and no browser or proxy listener is started.

rea inspect-web-network-capture /absolute/session.har har --json
rea inspect-web-network-capture /absolute/session.har har --record 2 --record 0 --json

{
  "name": "inspect_web_network_capture",
  "arguments": {
    "capture_path": "/absolute/session.har",
    "format": "har",
    "record_ordinals": [2, 0]
  }
}

Omit ordinals to return every record. Explicit selection preserves caller order and original zero-based producer ordinals; duplicate or out-of-range selections are input errors. Every record is validated before selection, so selecting one entry does not hide a malformed entry elsewhere.

For agent discovery over MCP, request detail: "summary". REA retains the complete selected Evidence in the session and returns identity and counts. Use normalized_result.parent_evidence_id with inspect_analysis_view:

{
  "source": {
    "kind": "retained-evidence",
    "evidence_id": "<parent_evidence_id>"
  },
  "view": { "kind": "capture", "detail": "preview", "offset": 0, "limit": 20 }
}

Preview pages select recorded HTTP headline fields, event names/times when present, original locations and byte descriptors; they omit headers, XML and payload content. Choose detail: "complete" in that view for exact record pages, including all sidecars. Offsets follow the parent's selected record order; producer ordinals remain unchanged. total_records counts the original capture while retained_records and page coverage count records in the parent. An exhausted page does not establish absence from unselected records.

Views do not reopen the file or rerun its decoder. They remain historical Evidence if the source changes or disappears; inspect the capture again to observe new bytes. The inspection tool's default detail: "complete" preserves existing inline delivery. For CLI use, save complete inspection JSON and pass it as inline Evidence to inspect-analysis-view; the same summary and capture page contracts apply. Large complete records can still exceed MCP's response budget; export the retained Evidence when a single record cannot fit.

Formats and upstream profiles

HAR uses unchanged har-schema@2.0.0 draft-06 schemas, ajv@8.20.0, ajv-formats@3.0.1, jsonc-parser@3.3.1 JSON visitor, and lossless-json@4.3.1 numeric representations, pinned in the npm lockfile. Only the HAR 1.2 profile is supported. Unknown extensions remain reported evidence. Duplicate object keys, including equal values and escaped spellings, are rejected before materialization. Prototype-named members such as __proto__ are preserved as ordinary own JSON members without prototype mutation. Original capture files remain unchanged. The observed mitmproxy 12.2.3 SaveHar profile can emit postData.text: null for a missing request body. REA preserves that reported null, omitting the optional field only from its validation copy for this exact producer profile; it does not invent an empty string or body bytes.

Native mitmproxy decoding requires a caller-supplied mitmdump 12.2.3 on Linux. Set its absolute executable path:

REA_MITMDUMP_COMMAND=/absolute/mitmdump rea inspect-web-network-capture /absolute/session.mitm mitmproxy --json

REA does not install mitmproxy. Its owned process uses a private configuration directory, --no-server, and the unchanged upstream mitmproxy.io.tnetstring decoder. It does not run FlowReader migrations or convert native states to HAR. Raw IDs, state versions, flow types, backup states and unknown extensions are preserved without synthesizing connections, timestamps or content. The tested upstream source is tag v12.2.3, commit 6c09d56e4c29a92f5ad01b03199977584b8ea14f; other native tool versions return an explicit unsupported-profile diagnostic. Non-Linux native decoding is not supported by this adapter.

Reading Fiddler captures (.saz)

Fiddler Everywhere saves traffic in Session Archive Zip (.saz) files. Inspect native SAZ directly, without installing Fiddler or converting to HAR:

rea inspect-web-network-capture /absolute/session.saz saz --json
rea inspect-web-network-capture /absolute/session.saz saz --record 0 --json

MCP uses the same capture_path, format: "saz", and optional record_ordinals fields as the examples above. REA pairs raw/<id>_c.txt requests, _s.txt responses, and _m.xml metadata by filename stem. Archive member names identify the source; zero-based ordinals follow each session's first member in ZIP directory order, not its numeric ID or capture time.

HTTP fields and ordered duplicate headers are retained, with stored body bytes in binary sidecars. Bodies are not dechunked or decompressed. Metadata is an XML node tree; optional _w.txt and _g.txt files retain opaque WebSocket and gRPC message bytes. Missing members remain null, distinct from empty bodies. See Telerik's SAZ format reference.

The existing ZIP reader verifies read members; expanded archive contents are limited to 32 MiB in addition to the input/output budgets below. Encrypted archives and unrecognized raw session members are unsupported. SAZ requires an enforced decoder memory bound: Node's fixed heap, or the Windows Job Object commit limit. Bun on hosts without that Job Object limit returns capability unavailable before starting the SAZ decoder. Non-session members are inventoried without decoding their content. Original files remain unchanged. Linux verification includes independently checked public recorded Mattermost captures from FOREST and the Fiddler author's encoding corpus, plus synthetic malformed/limit fixtures. Their exporting product versions are not authenticated. An interactive export from a current Fiddler Everywhere installation and its live MCP server remain unverified. Support here is the bounded documented raw HTTP/XML SAZ layout, not every product/version profile.

For visual inspection, use Everywhere's Import Snapshot, then Inspectors and Overview. HAR remains an alternative: select sessions, choose Export > HTTPArchive, and confirm log.version is "1.2". Preserve the original SAZ when exporting. See the import/export instructions.

Fiddler Everywhere MCP and public skills

For agent-driven traffic debugging, connect Everywhere's MCP server separately from REA. Run a current Everywhere release with MCP access (Trial, Pro, or higher), internet access, and a compatible MCP client. Use Settings > MCP Server > Coding agent, or Manual setup with the generated API key. The default endpoint is http://localhost:8868/mcp. See Telerik's MCP setup guide and agent-skills prerequisites.

Telerik's public skills cover installation (fiddler-download-setup), connection setup, and traffic analysis:

npx skills add telerik/fiddler-agent-tools --skill fiddler-mcp-setup
npx skills add telerik/fiddler-agent-tools --skill fiddler-traffic-debugging

After setup, reload the agent client and use the connected server's advertised tool names and schemas. Check status, list sessions, then inspect relevant session IDs. Set sessionsSource to LiveTraffic for HTTP(S) traffic or AgentCalls for enriched LLM calls; active filters affect the session list. For an existing run, skip the skill's pre-capture steps that replace process filters and clear sessions. The documented MCP session sources do not provide a saved-snapshot selector; use the SAZ workflow above for saved files. REA does not register or wrap the Fiddler MCP server.

Reading the evidence

• artifact identifies the caller-selected file and stable snapshot digest.
• records preserve producer order/ordinals and original JSON pointers, byte ranges, or SAZ member names. No live browser transaction or scenario IDs are invented.
• reported retains the producer's fields. HAR container metadata is returned separately, with log.entries replaced by null and records_pointer identifying the record collection. This is an inspection representation, not a reconstructed HAR file.
• numeric_literals preserve HAR number lexemes and native integer/float representations, including unsafe integers and non-finite native floats. Values that cannot be safely represented as JSON numbers are null in the reported view. Unsafe standard HAR numeric fields fail schema validation; unsafe extension numbers remain available through their sidecars.
• binary_fields retain exposed bytes, base64 and SHA-256 independently of declared sizes. Valid HAR content.encoding: "base64" is decoded exactly; producer-decoded Unicode text, missing text and unknown encodings do not establish original body bytes. Post-data parameters do not reconstruct a multipart body. Native byte fields also have an exact UTF-8 display view when valid; binary sidecars establish their actual representation. Native missing content and empty content remain distinct.
• redactions identify known transport authentication exclusions and explicit sensitive-value exclusions. Redacted byte fields retain neither original bytes nor their digest. Unknown extension names and token-looking query parameters do not establish sensitivity.

Mark sensitive literal string/UTF-8 byte values with MCP sensitive_values, or repeat CLI --sensitive-value. These declarations are never persisted in Evidence parameters; the count is retained. Explicit text/UTF-8 byte matches exclude the entire field with a reported null rather than substitute a text marker or rewrite payload bytes. This prevents replacement markers from reintroducing declared literals. The file digest identifies the original artifact unless it matches an explicit declaration; in that case artifact.sha256 and Evidence subject are null with an explanation. A sensitive property name excludes that entire property and its sidecars; a scope: "property-name" redaction points to its actual parent. No substitute property name or child pointer is invented. Omitted subtrees are still validated, including canonical HAR base64. Explicitly sensitive artifact paths are empty in Evidence and omitted from locations, while the original SHA-256 and size remain available unless the digest itself is explicitly excluded. Failure messages, diagnostics and cleanup resources follow the same explicit declarations without changing error types; sensitive issue pointers identify a real ancestor instead of a fabricated coordinate. Header/cookie authentication values and known transport URL userinfo are excluded structurally, including native backups. HAR redaction and API-surface projection share the same recorded-URL parser. Canonical userinfo spans are removed without rewriting the remaining source text. Credential-bearing spellings without a safe raw span, such as slashless or extra-slash HTTP URLs, are excluded as a whole transport field. Ordinary extension text and noncredential path/query values remain unchanged.

Generated free-text limitations follow the same literal declarations, including global, per-record and Evidence explanations added during projection. Contract field names, typed discriminators and exact decoder identities keep their canonical meanings; declarations do not rename formats or providers.

Historical evidence does not prove runtime attribution, execution or deployment authenticity. Mitmproxy messages are upstream-assembled messages, not recovered wire fragments. Native dictionary duplicate keys have the unchanged upstream decoder's last-value semantics; this adapter does not claim to recover discarded duplicates or the original numeric spelling of parsed native floats.

Derived API surface

Pass retained HAR Evidence to inspect_analysis_view with view: {"kind":"api-surface","offset":0,"limit":50}. Omitted offset and limit are 0 and 50. The view groups request lines by method, WHATWG URL origin and path template, sorted by origin, template and method. Query strings, fragments, credentials, headers and bodies are not copied into groups.

Select include_query_parameter_names: true in the view to include distinct observed query names per group. The default and explicit false omit the query_parameter_names field. Selected groups include an array of {name, record_ordinals} entries, sorted by Unicode code point; each name's ordinals follow the parent's selected record order and occur once per record. For /products?category=books&page=1 and /products?category=games&sort=price, names are category, page and sort. Query values and fragments are not copied into this inventory.

Names use WHATWG URLSearchParams form-query decoding: literal + becomes space, %2B becomes +, percent escapes decode as UTF-8, and empty names are retained. Empty query pairs are ignored. Original URLs stay in parent Evidence; name decoding does not normalize the recorded paths used for grouping. The inventory describes observed names, without inferring required parameters, value types or a complete API schema. Sensitive-parent refusals still apply.

Rule	Exact segment format	Placeholder
numeric	ASCII digits only	{numeric}
uuid	RFC 9562 textual UUID, any version, case-insensitive	{uuid}
hex	At least 32 hexadecimal digits	{hex}
iso-date	Valid calendar date YYYY-MM-DD	{iso-date}

Rules apply in table order to the recorded, still-encoded request path, read before WHATWG dot-segment removal, so /a/%2e%2e/admin and /admin stay distinct. Segment indexes start at zero after the leading slash. Each matched segment lists its observed literals and basis: "inferred". templated_groups counts templated groups across every page. Because paging follows the full grouping, every page is inferred Evidence when that count is nonzero, and derived Evidence only when no group was templated. Version prefixes, short opaque IDs and digit-bearing route names stay literal. Samples merge only when method, origin, and exact segment rules match. The view does not infer further cross-sample patterns.

Groups cite parent record ordinals and distinct statuses and MIME types (lowercase type/subtype without parameters). An invalid type/subtype essence is unknown; parameters do not affect this projection. Flags report single samples, mixed statuses or mixed content types. coverage pages groups; records separately reports examined, total and excluded parent records. Ordinal subsets carry a limitation. Null URLs are excluded as url-redacted; unparseable URLs, URLs without an origin, spellings without scheme://authority (such as https:host/path), and authorities containing a tab or newline as url-unparseable. Unavailable request objects or methods are explicitly excluded. Unavailable response fields, including HAR's status: 0 and an empty mimeType, remain unknown, not invented statuses or MIME types.

The view makes no handler-identity, schema or causality claim. It performs no network activity. Native mitmproxy, SAZ and qlog captures return a typed unsupported error. Parents inspected with sensitive_values, or whose Evidence does not record sensitive_value_count, return a typed unsupported error whose reason is the canonical token sensitive_values_unretained. The view would write path templates and limitation text that it cannot check against declarations the parent does not retain, so the refusal does not repeat declaration text.

One accumulator owns group identity, observed-value/status/MIME sets, ordinals, exclusions and deduplicated limitations. It scans path spans without splitting literal paths into arrays. Before schema parsing, it reserves the capture clone and validation scratch by walking the parent without cloning it. Inline requests borrow the Evidence value through CLI/MCP envelope validation; the application admits the entire portable envelope before authenticated parsing or hashing. The envelope clone, hash scratch and capture clone stay charged during grouping. Temporary URL/path/MIME/query work and retained state must fit together within a 96 MiB projection representation budget. A whole group or merge is admitted before allocating its retained sets, map entries or array values. Fixed group storage, distinct text, exclusions and limitations count as well as matched segments. Per-record reservations are released after each record; repeated values do not accumulate another retained charge. Only the requested page is materialized as output groups. Opt-in query projection reserves parser tuples and the per-record name set before decoding, then admits distinct retained names and source ordinals before changing a group. Repeated names within a request retain that ordinal once.

The representation budget uses conservative storage and worst-case JSON-escaping allowances; it is not an enforced V8 heap or process-memory limit. It is separate from the decoder's actual reply-byte limit and MCP transport admission. Exceeding it returns resource_constraint without a partial view. Limitations on the parent envelope, capture and examined records are deduplicated onto the view. Portable captures must retain unique ordinals within their declared total; caller-selected subsets can preserve any requested ordinal order.

Resource and lifecycle boundaries

Complete evidence has a 32 MiB input, 96 MiB decoder reply and 64-level nesting budget. Exceeding a budget returns no partial success. Oversized selected captures return an input error identifying capture_path and the byte budget; owned reply/output failures remain output or provider errors. HAR, SAZ and qlog run in an owned 192 MiB Node old-generation heap with one V8 worker. Mitmproxy decoding applies Linux limits of 768 MiB address space, 30 seconds CPU and 96 MiB file output; both commands have a 30-second wall deadline and independently supervised process cleanup. Owned decoder diagnostics retain at most 1 MiB across stdout and stderr; the collector drops overflow as it arrives, reports the limit failure and verifies cleanup. Heap limits alone do not establish aggregate RSS limits. SAZ and qlog refuse decoding when neither a Node heap limit nor a Windows Job Object bound can be enforced. Existing HAR availability is preserved. When REA runs on Bun, the HAR/SAZ/qlog decoder runs on Bun, which ignores these V8 heap flags; its limitations and resource failures then omit the heap sizes. On Windows, the decoder's owned Job Object instead limits its committed memory to 704 MiB, the 192 MiB budget plus a 512 MiB reserve for Bun itself. The limitations state that limit, and reaching it returns resource_constraint with process_memory_limit_bytes, whatever exit status Bun reports.

Observed decoder memory exhaustion returns resource_constraint, with the selected capture, applicable limits and retained process diagnostics. HAR/SAZ/qlog's old-generation heap is fixed; inherited NODE_OPTIONS cannot raise it. Record selection happens after complete decoding and does not reduce that workload. Use a smaller capture exported by its producer or another decoder with sufficient capacity, retaining the original for provenance. Subsets do not establish complete-capture coverage. Repeating the same workload or running provider health diagnostics does not resolve the heap constraint.

Stable regular-file reads reject symlinks, replacement and concurrent changes. Private snapshots, declarations and tool configuration are removed before the result returns. Cleanup uncertainty retains the selected capture, resource and original failure information. The original capture is never changed.

Excluded coordinates and read failures

Explicitly marked values also exclude matching source coordinates and their sidecars. A hidden record coordinate is reported as location.kind: "unknown"; REA does not invent a replacement pointer. Original record ordinals and artifact digests remain available.

Host filesystem read denials return code: "access_denied", category: "unavailable", the actual EACCES/EPERM code and read-access guidance. Missing files remain input failures. Cleanup failures retain the prior structured error, including its input constraints or provider diagnostics, with explicitly marked text excluded.

An observed replacement or in-place change during stable artifact acquisition returns code: "artifact_changed", category: "integrity_mismatch" and retryable: true, retaining the selected path and reader's reason. Wait until the capture file is stable before retrying. No unstable snapshot is decoded. Command cleanup failures retain the original status and both diagnostic streams; the decoder's ownership preparation receives the same cancellation signal.

MCP advertises the same strict named input contract used by the application. Historical inspection delegates argument validation to that shared application boundary so accepted explicit-sensitive declarations also cover invalid argument names and other correction details. The SDK receives raw arguments through its Standard Schema interface; malformed inputs still fail before decoder or filesystem effects and return the normal structured REA error. Protocol-envelope validation remains owned by MCP.

Retained aioquic qlog

Select format: "qlog" through inspect_web_network_capture, or:

rea inspect-web-network-capture /absolute/origin.qlog qlog --json
rea inspect-web-network-capture /absolute/origin.qlog qlog --record 95 --record 0 --json

The initial profile is aioquic 1.5.0, JSON qlog 0.3: one JSON object with qlog_format: "JSON", qlog_version: "0.3", traces containing object events with name, finite numeric time and object data. JSON-SEQ, JSONL, columnar array events and other versions are unsupported. Duplicate JSON members, malformed UTF-8, invalid interpreted QUIC integers and excessive nesting fail without partial success, including in events outside the selected ordinals. Well-formed event subsets and missing frame metadata remain inspectable. Unknown extensions are retained; this is not validation of every qlog schema.

Choosing the format selects the interpretation profile; the file does not necessarily report or authenticate an aioquic version. The profile's clock uses Unix-epoch milliseconds, verified in aioquic 1.5.0's QuicLoggerTrace log_event/encode_time. The qlog.clock.basis and Evidence analysis profile state that assumption explicitly. Numeric lexemes survive independently of safe JSON-number projections; decimal spelling does not establish physical clock precision or monotonicity.

Every event has a global ordinal from trace/event source traversal and its original /traces/T/events/E pointer. This order is not a global time sort. Trace index and the selected artifact identify a connection observation; reported ODCID is preserved without claiming global uniqueness. Streams are scoped by trace, stream ID and sent/received direction. Control/QPACK streams are retained, so counting streams does not count HTTP requests.

qlog is a typed facet required exactly for this format. Its scope is all-recorded-events-before-selection: selection changes returned event records while facts cite the original ordinals across the entire recorded file. The container retains trace metadata with each events array replaced by null; there is no single events pointer shared by all traces.

Fact	Basis and limits
Original event and loss declaration	Observed endpoint report; recovery:packet_lost does not prove actual network loss. Missing packet number/type remains unknown.
STREAM ranges and byte totals	Derived per trace and direction from reported offsets and lengths using exact integer arithmetic. unique_bytes unions intervals; frame_length_sum includes overlaps; repeated_bytes is their difference. Overlap alone does not prove retransmission or equal contents.
FIN final sizes	Reported offset plus length where FIN is true; multiple conflicting sizes remain visible. A final size does not establish complete coverage or a received body.
Incomplete fact records	Ordinals with omitted/redacted interpretable frame metadata; usable fields in other records survive. An empty list does not establish complete logging or capture.
HTTP bodies and causality	body_bytes: "not-reported"; lengths and headers are metadata, with no reconstructed body, hash, timing causality or live process attribution.

QUIC integer fields interpreted here accept exact nonnegative JSON integer values through 2^62 - 1, including equivalent exponent notation. Offsets plus lengths must fit that range. Derived sums are decimal strings and are not rounded to JavaScript numbers. A missing offset is unknown, never defaulted to zero. Ranges can start above zero or contain gaps. Packet headers, HTTP events, raw lengths and unknown extensions remain producer evidence rather than being normalized into invented HAR requests.

The adapter excludes authorization/proxy authorization/cookie/set-cookie values in known HTTP frame events, reset tokens in transport parameters and NEW_CONNECTION_ID frames, and NEW_TOKEN frame tokens. Known URL header userinfo and explicit sensitive values follow the shared exclusions. Ordinary extension fields and token-looking query text remain retained. Explicit declarations also cover normalized numeric projections, derived totals and trace pointers; facts that cannot be safely shown are omitted with incomplete-record coordinates. No keylog, PCAP, live URL or recorded target is opened by the qlog decoder.

To repeat the real-provider lane with local caller-supplied evidence from the educational aioquic 1.5.0 experiment (one origin trace, known 32,803-byte stream coverage and one 1,169-byte repeated range in the loss case):

npm run verify:web:qlog -- /absolute/control/origin.qlog /absolute/loss/origin.qlog /absolute/new-report.json

This lane checks built CLI/stdio MCP parity, SDK-converted JSON Schemas, artifact digests, original event count, selection scope, retained parent lookup, credential exclusions and the known control/loss facts. The report is created exclusively and contains no keys or captured credential values. It is a fixture-specific verification, not a general loss detector. CI uses synthetic format inputs for malformed cases and limits; those tests do not establish producer provenance. PCAP parsing and correlation remain outside this stage.

Focused qlog views

Use MCP inspect_web_network_capture with format: "qlog", detail: "summary" for identity, profile, scope and retained-fact counts. Then pass its normalized_result.parent_evidence_id to inspect_analysis_view as a retained-evidence source.

{"kind":"qlog","facet":"traces","offset":0,"limit":10}
{"kind":"qlog","facet":"streams","trace_index":0,"offset":0,"limit":10}
{"kind":"qlog","facet":"contributions","trace_index":0,"stream_id":"0","direction":"sent","offset":0,"limit":20}

Trace pages omit nested lists and give their counts. Stream pages preserve exact byte totals but omit contributions, ranges and final-size lists. For those lists select contributions, ranges or final-sizes with all three stream selectors. loss-declarations and incomplete-records need only trace_index. Offsets count rows in that retained facet; defaults are 0 and 64. Missing or ambiguous selectors fail rather than choosing a connection.

These views page already interpreted facts without decoding again or opening the source, and work after its deletion. Facts still cover all recorded events before parent record selection. Their exhaustion does not prove logging or network completeness. Event preview/complete pages remain available through kind capture, with original numeric lexemes and producer ordinals preserved.